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question_answer1) Why multi cellular organisms require special organs for exchange of gases between their body and their environment?
question_answer2) Name the process in plants where water is lost as water vapour.
question_answer3) Which is the food constituent that bile helps to digest and absorb?
question_answer4) Mention two structural features of small intestine which imparts it the absorptive capacity.
question_answer5) What are the final products after digestion of carbohydrates and proteins?
question_answer6) What is saliva? State its role in the digestion of food.
question_answer7) Name the process by which autotrophs prepare their own food.
question_answer8) In human alimentary canal, name the site of complete digestion of various components of food.
question_answer9) What is the primary requirement for pancreatic enzymes to act?
question_answer10) What do you mean by emulsification of fat?
question_answer11) State the difference between photosynthesis and respiration.
question_answer12) In the experiment, light is essential for photosynthesis leaf of the plant is covered with a strip as shown alongside. The leaf is plucked, strip is removed from it and putted in iodine solution. It is observed that uncovered portion turns blue black. Whereas covered does not with iodine solution why is it so?
question_answer13) Why is energy required to develop root pressure?
question_answer14) Which part of the bile juice is useful in digestion?
question_answer15) In an experiment, milk produces a red precipitate when heated with Benedict's solution. Which nutrients does milk contain?
question_answer16) Lipase solution was added to milk. After 30 minutes the milk had become more acidic. What were the substrate and end product in this reaction?
question_answer17) In an activity by a group of student, the proportions of chemical constituents of the human body is drawn on the graph. Name the major and least constituent of the body with reference to the graph.
question_answer18) In an experiment, a test tube containing pieces of bread (powdered), saliva is added to it. What will be the result?
question_answer19) Name the green dot-like structures in some cells observed by a student when a leaf-peel was viewed under a microscope. What is this green colour due to?
question_answer20) What is the role of pancreatic enzymes in human body?
question_answer21) (a) Which part of the alimentary canal help in eliminating the unabsorbed food? (b) How is the exit of waste material regulated?
question_answer22) Why does our mouth waters when we eat something?
question_answer23) A person vomits out milk every time he drinks it what will be the reason for this?
question_answer24) Complete the following blanks The action of intestinal juice converts
question_answer25) How would digestion of food be affected if the bile duct is completely blocked?
question_answer26) Explain the process the nutrition in Amoeba.
question_answer27) Two green plants are kept separately in oxygen free containers, one in the dark and other in continuous light. Which one live longer? Give reasons.
question_answer28) How do guard cells regulate opening and closing of stomatal pores?
question_answer29) Name any two parasitic plants and two parasitic animals.
question_answer30) Explain the significance of peristaltic movement that occurs all along the gut during digestion.
question_answer31) Which is the largest digestive gland in human body? What is its function?
question_answer32) Why does the burning candle in bell jar A stop burning before the candle in bell jar B? Both bell jars are placed near a window in strong sunlight.
question_answer33) Food does not pass through the digestive system by 'gravity'. You can still digest food even if you are lying down. Explain how food passes through our digestive system.
question_answer34) What is the significance of emulsification of fats?
question_answer35) Following table shows the pH value of the plaque surrounding the teeth of a girl over 3 hrs. Plaque is a deposit which collects around teeth. Time/h pH 0.0 7.0 01.0 7.0 02.0 7.1 03.0 7.2 0.40 4.1 (a) Other than food remains, state three constituents of plaque. (b) State the time during the day when condition most favourable for process of tooth decay.
question_answer36) What is the difference between ingestion and egestion?
question_answer37) Write a short note on the different types of heterotrophic nutrition.
question_answer38) What are the adaptations of leaf for photosynthesis?
question_answer39) How is required pH maintained in the stomach and small intestine?
question_answer40) A person suffering from a frequent stomach pain and vomiting, went to the Doctor. Doctor asked him to go for an ultrasound. In the report a stone was found in his gall bladder. Doctor asked him to remove the gall bladder by operation. But he was reluctant to go for the operation. Read the above passage and answer the following questions (a) Does the removal of gall bladder affect person's health? (b) What is the function of gall bladder? (c) What values are shown by the person?
question_answer41) Given one word for the following (a) I am secreted from the walls of stomach. I kill all the harmful germs present in food and help my friend pepsin to work in acidic medium. (b) We are the biocatalysts. We enhance the rate of metabolic activities. (c) We push the food forward by rhythmic contraction.
question_answer42) Draw a well labelled diagram of a palisade leaf.
question_answer43) What are the functions of gastric glands present in the wall of the stomach?
question_answer44) Why does absorption of digested food occur mainly in the small intestine?
question_answer45) The drawing shows the inside of the small intestine. Using the drawing, explain how structure of the lining of the small intestine helps to absorb more food.
question_answer46) Scientists have studied the way crops grow near hedges that surround fields. The diagram shows their results. (a) Suggest why crops close to the hedge do not grow as well as crops in the middle of the field. (b) Why do crops around 10-15 metres from the hedge grow better than crops in the middle of the field?
question_answer47) List the three events that occur during the process of photosynthesis. Explain the role of stomata in this process.
question_answer48) Samriddhi's father has a plot of land in the city's side where he wants to construct a house. The area has few trees, which are very dear to her father and he does not want to cut the trees. Trees provide oxygen, which is very essential for living organisms. Her father also desperately needs a house for his family. Read the given passage and answer the following questions (a) Should Samriddhi's father construct the house after cutting the trees? (b) How can the family compensate for the loss in terms of oxygen supply? (c) What practices will be required after planting the trees? (d) What values are shown by the Samriddhi's father?
question_answer49) A group of students conducted a survey of their locality to compare the number of trees with the number of factories. After the survey they found that number of trees were cutted due to industrialisation. They concluded that trees are very less in number as compared with number of industries in that area. Read the above passage and answer the following questions (a) Why the trees are important to us? (b) How can people of that area compensate for the loss of in terms of oxygen supply? (c) What values are shown by the students?
question_answer50) Fig A shows a diagram of the human alimentary canal. Fig. A (a) On Fig. A label structures T, U and V (b) Name the secretion which passes down tube W and explain how it helps in fat digestion. (c) In cases of diarrhoea, name the major process in region X which is no longer occurring normally.
question_answer51) Explain the process of digestion of food in mouth, stomach and small intestine in human body.
question_answer52) (a) Draw a diagram depicting human alimentary canal and label on it gall bladder, liver and pancreas (b) State the role of liver and pancreas. (c) Name the organ which performs the following functions in humans (i) Absorption of digested food (ii) Absorption of water
question_answer53) Describe holozoic nutrition in detail using one example.
question_answer54) (a) Why is nutrition a necessity for an organism? State three reasons. (b) What is likely to happen if green plants disappear from earth?
question_answer55) (a) 'All plants give out oxygen during day and during night'. Do you agree with this statement? Give reason. (b) Write two difference between autotrophic and heterotrophic nutrition, (3)
question_answer56) (a) Mention the role of HC1 in the stomach. (b) What function is served by the following? (i) Gastric sphincter (ii) Anal sphincter
question_answer57) (a) Give reasons, why (i)Herbivores have longer small intestine as compared to carnivores? (ii) Mucous is secreted along with hydrochloride acid in the stomach? (iii) Emulsitication of fats is necessary? (b) Explain how does Paramecium obtain its food.
question_answer58) The graph shows how the amount of carbon dioxide taken in or given out by a plant varies through a 24-hour period. (a) At what time did photosynthesis start? (b) At what time was the rate of photosynthesis greatest? (c) At what time of the day did it get dark? (d) (i) What processes causes carbon dioxide to be given out? (ii) Does this process only occur when it is dark? (e) What other factors could affect the rate of photosynthesis?
question_answer59) Name the following (a) The process in plants that links light energy with chemical energy. (b) Organisms that can prepare their own food. (c) The cell organelle where photosynthesis occurs. (d) Cells that surround a stomatal pore. (e) Organisms that cannot prepare their own food. (f) An enzyme secreted from gastric gland in stomach that acts on proteins.
question_answer60) Wenyong set up an experiment to investigate the effect of light on photosynthesis (see diagram). He counted the number of bubbles of oxygen gas produced. His results are given in the table Disance of lamp from tube (cm) 20 40 60 80 100 120 Number of bubbles per minute 24 12 7 4 2 2 (a) Plot a graph with the independent variable of distance on the x-axis and the dependent variable of number of bubbles on the y-axis. (b) Explain the shape of the graph.
question_answer61) In each of the following situations what happens to the rate of photosynthesis? (a) Cloudy days (b) No rainfall in the area (c) Good manuring in the area (d) Stomata gets blocked due to dust
question_answer62) The graph below shows the progress of carbohydrate (?), protein (--) and fat (- -) digestion in the human alimentary canal. Sections P to T represent different parts of the alimentary canal. (a) Identify the parts of the alimentary canal that R and S represent. (b) Explain the graph for protein digestion. (c) Complete digestion occurs at the end of part T. What are the contents of the gut at the end of part T, assuming that absorption does not occur? (d) How will digestion be affected, if the pancreas malfunctions?
question_answer63) State one similarity between lungs and gills.
question_answer64) If a cell is given adequate supply of oxygen, which respiration process will it follow?
question_answer65) How do plants utilise the carbon dioxide produced during respiration?
question_answer66) What is the haemoglobin? Where is it found?
question_answer67) Why carbon dioxide is always transported in dissolved form?
question_answer68) Define breathing.
question_answer69) What is the principle of exchange of gases?
question_answer70) What are the maximum number of oxygen molecules, which one haemoglobin molecule can carry?
question_answer71) In which organelle of cell does respiration occur?
question_answer72) What changes occur in diaphragm and intercostal muscle when a person breathes out?
question_answer73) Name the respiratory pigment in human beings.
question_answer74) Write role of haemoglobin.
question_answer75) Name the gas lacking of which results in the production of lactic acid in muscles.
question_answer76) Write the end product of anaerobic respiration in yeast cells.
question_answer77) Write the path travelled by a molecule of oxygen when it enters the body.
question_answer78) What changes occur in diaphragm and intercostal muscle when a person breathes in deeply?
question_answer79) What are the end products formed during fermentation in yeast? Under what condition a similar process takes place in our body that leads to muscle cramps?
question_answer80) What do you mean by respiration? Name two types of respiration occurring in a cell.
question_answer81) Plants have low energy needs as compared to animals. Explain.
question_answer82) What happens to the breathing rate during rigorous exercise?
question_answer83) In the test tube A and B shown below, yeast was kept in sugar solution. Which products of respiration would you expect in tubes A and B?
question_answer84) State the structures responsible for gaseous exchange in (a) plants (b) human beings
question_answer85) Give reasons (a) Rings of cartilage are present in trachea. (b) Lungs always contain a residual volume of air.
question_answer86) List four common features of the respiratory organs in aquatic and terrestrial animals.
question_answer87) State in brief the role of lungs in the exchange of gases.
question_answer88) State basic difference in the processes of respiration and photosynthesis.
question_answer89) Explain the process of breakdown of glucose in a cell (a) in the presence of oxygen. (b) in the absence of oxygen.
question_answer90) State the role of the following in human respiratory system. (a) Nasal Hairs (b) Diaphragm (c) Alveoli
question_answer91) State one word for the following (a) Mechanism for moving the air in and out of the body. (b) Structure in plants to facilitate gaseous exchange. (c) Respiratory organ in aquatic organism.
question_answer92) What is the role of respiratory pigment in respiration? Give one example.
question_answer93) State reason for the following (a) Trachea does not collapse when it has insufficient air. (b) Aquatic animals breathe rapidly. (c) Haemoglobin is present in RBC in humans.
question_answer94) Nisha is going through the science notebook of new brother. She suddenly came across a question stating, what is the reason behind regular formation of cramps in cricketers? Her brother stated the answer as cramps are developed due to tear in ligament. Read the above passage and answer the following questions (a) Is this answer correct? State reasons for your answer. (b) What values were shown by Nisha?
question_answer95) What are alveoli? Mention their role in respiration.
question_answer96) List three characteristics of lungs which make them an efficient respiratory surface.
question_answer97) Aashima participated in the zonal relay race competition. During the practice session, she got cramps in her muscles Based on the above text answer the following questions (1) (a) Why Aashima got cramps in her muscles? (b) Write the pathway involved in this reaction. (c) What values were shown by Ashima?
question_answer98) What are the different ways in which glucose is oxidised to provide energy in various organisms?
question_answer99) What is the fate of the glucose formed as a result of photosynthesis? Explain in detail.
question_answer100) Describe the process of respiration in human beings.
question_answer101) (a) What is the difference between respiration in plants and in animals? (b) How does respiration occur in the stem of the plant?
question_answer102) Draw diagram of respiratory system and label the following (a) Part through which air is taken in. (b) Part which protects the lungs. (c) Part which carries the air into the lungs. or (a) Part where air is filtered by fine hair and mucous. (b) Part which terminates in balloon-like structme. (c) Balloon-like structures where exchange of gases takes place. (d) Part which separates chest cavity from abdominal cavity. or (a) Organ that is surrounded by cartilaginous ring. (b) Structure where exchange of gases takes place. (c) Voice box. (d) Muscular structure which flattens" during inhalation.
question_answer103) The diagrams of the thorax below show the mechanisms involved during breathing. (a)Which phase of breathing does diagram A and B each represent? (b) List the structures through which air passes in diagram A. (c) If the atmospheric pressure is 760 mmHg, what would you expect the alveolar air pressure in diagram B to be? Explain your answer. (d) Describe three ways in which the alveoli are adapted for efficient gaseous exchange.
question_answer104) Why is the walls of ventricles thicker than walls of atria?
question_answer105) What is transported by lymph?
question_answer106) What is transported by plasma ?
question_answer107) What is the advantage of having four-chambered heart ?
question_answer108) What will happen if platelets are absent in the blood ?
question_answer109) Complete the following table Organism Chambers of Heart Fishes ..................... Amphibians ..................... Reptiles ..................... Human beings .....................
question_answer110) Why do veins have thin walls as compared to arteries ?
question_answer111) Which mineral control the heart?
question_answer112) What is the other name of SA node ?
question_answer113) Why SA node is called as the pacemaker of heart ?
question_answer114) Oil. In which form, iron is present in haemoglobin ?
question_answer115) How much blood is pumped to the brain in one minute?
question_answer116) Leakage of blood from vessels reduces the efficiency of pumping system. How is the leakage prevented ?
question_answer117) Write the functions of any two chambers of human heart.
question_answer118) State the role and functions of (a) Blood (b) WBC
question_answer119) Write the functions of lymph in human transport system.
question_answer120) What does the blood consist of?
question_answer121) Why are valves present in heart and veins?
question_answer122) Which mechanism plays an important role in transportation of water in plants During daytime ? (b) At night ?
question_answer123) How can the sugar stored in root or stem tissue transported to buds in spring?
question_answer124) What is the role of transpiration pull in transportation ?
question_answer125) From where does roots obtain water and minerals ?
question_answer126) What is blood clotting ?
question_answer127) The body temperature of some organisms depends on the temperature in the environment. Comment.
question_answer128) Write two functions of blood in human beings
question_answer129) Draw a labelled diagram of the pumping machine in human beings.
question_answer130) Give reason: The separation of the right side and left side of the heart is useful to keep oxygenated and deoxygenated blood away from mixing.
question_answer131) What are capillaries? State the function performed by them?
question_answer132) How is the process of transpiration useful to plant?
question_answer133) Mention the two main components of the transport system in plants. State one function of each one of these components?
question_answer134) How are water and minerals absorbed by the plant ?
question_answer135) What do the following transport ? (a) Xylem (b) Pulmonary artery (c)Pulmonary vein (d) Phloem
question_answer136) During one cycle how many times blood goes to heart of fish and why?
question_answer137) What would be the consequences of deficiency of haemoglobin in our bodies?
question_answer138) List the various components of blood. Also write their function.
question_answer139) State reason for the following (a) Walls of ventricles are thick and more muscular than walls of atria. (b) Arteries have thick and elastic walls. (c) Arteries form capillaries.
question_answer140) (a) What is lymph? (b) How is it formed in the body ? (c) Explain its role in our body ?
question_answer141) What is the differences between artery, vein and capillary? (1x3)
question_answer142) What is translocation ? How it takes place in plants?
question_answer143) (a) Transport of food in plants require living tissues and energy. Justify this statement. (b) Name the components of food that are transported by the living tissues.
question_answer144) List the three kinds of blood vessels of human circulatory system and write their functions in tabular form. (1x3)
question_answer145) Nisha was in a party where people were dancing on the dancing floor. A person on the floor suddenly felt severe pain on chest. He also felt dizziness. Some people were mentioning that he might have a heart attack. Nisha immediately called an Ambulance. Read the above passage and answer the following questions (a) What are the causes of a heart attack? (b) What are the symptoms of a heart attack? (c) What values were shown by Nisha?
question_answer146) Arjun was admitted to a city hospital for cardiac arrest. Cardiologist examine and suggest to go for artificial pacemaker operation. Read the above passage and answer the following questions (a) What is artificial pacemaker? Where it occur in the body? (b) What is artificial pacemaker operation? (c) What values should be incorporated by Arjun to ensure good health of his heart?
question_answer147) Seema's school decided to create awareness among people about the chronic diseases of heart. Such kind of disorder or diseases have become very prevalent in recent years. Being the student head of the programme Seema is asked to make an outline of various diseases for reference. Read the above passage and answer the following questions (a) Enlist some of the diseases that Seema will include in the programme. (b) What values were shown by Seema?
question_answer148) (a) Draw a schematic representation of transport and exchange of oxygen and carbon dioxide during transportation of blood in human beings and following parts label on it. Lung capillaries, Pulmonary artery to lungs, Aorta to body, pulmonary veins from lungs. (b) What is the advantage of separate channels to mammals and birds for oxygenated and deoxygenated blood ?
question_answer149) (a) What do you understand by transpiration? (b) What is the role of transpiration in transportation? (Explain with diagram). (c) What are the other functions performed by transpiration in plants ?
question_answer150) Complete the blanks in the following table (i) Aorta (a) ............. (ii) (b)........... Join together to form veins that convey blood away from the organ. (iii) (c)........... Brings deoxygenated blood from upper part of the body. (iv) Xylem (d) (v) Phloem (e)
question_answer151) Draw the sectional view of human heart and label the following (a) Chamber where oxygenated blood from lungs is collected. (b) Largest blood vessel in our body. (c) Muscular wall separating right and left chambers. (d) Blood vessel that carries blood from heart to the lungs. or (a) Part which receives deoxygenated blood from vena cava. (b) Part which sends deoxygenated blood to lung through pulmonary artery. (c) Part which receives oxygenated blood from lungs. (d) Part which sends oxygenated blood to all parts of the body through aorta. or (a) The chamber of heart that pumps out deoxygenated blood. (b) The blood vessel that carries away oxygenated blood from the heart. (c) The blood vessel that receives deoxygenated blood from the lower part of our body.
question_answer152) List and describe in brief in tabular form any five functions of blood.
question_answer153) Describe double circulation in human beings. Why is it necessary?
question_answer154) Sunaina was travelling with her family in the car. The car was driven by her father. On their way, they saw a biker on the road who met an accident and was bleeding profusely. Her mother stopped and helped out the accident victim. Her father however did not want to stop as he felt police may harass them if they stop? Read the above passage and answer the following questions (a) What values were shown by Sunaina's mother? (b) What happens if a person bleeds profusely? (c) What will you do if the hospital refuses to provide treatment unless the accident case is registered by police?
question_answer155) Which substance is selectively reabsorbed by the tubular part of nephron?
question_answer156) Name two excretory products other than oxygen and carbon dioxide in plants.
question_answer157) Name the process which helps in artificial removal of wastes from the body.
question_answer158) Why is urine yellow in colour?
question_answer159) Why is right kidney slightly lower in position as compared to the left kidney?
question_answer160) Given figure shows a kidney and associated structures. Which part contains the highest concentration of urea?
question_answer161) How is urea removed in the human body?
question_answer162) Name the substance which is present at a lower concentration in the renal artery than in the renal vein.
question_answer163) The four structures listed are part of the human excretory system. Bladder, Kidney, Ureter, Urethra In which order does a molecule of urea pass through these structures?
question_answer164) In artificial kidney, which substance passes from the blood to the dialysis fluid?
question_answer165) About 170 litres of fluid are filtered by the kidneys everyday. Only 1.5 litres are excreted in urine. What happens to the remaining 168.5 litres?
question_answer166) The diagram shows the structures associated with a human kidney. Identify X/Y and Z.
question_answer167) What are the different parts of human excretory system?
question_answer168) How much urine is passed by an human adult in 24 hours?
question_answer169) Which organ synthesises urea?
question_answer170) What causes the liquid part of blood to filter out from the glomerulus into the renal tubule?
question_answer171) What will happen, if one kidney of a person is removed?
question_answer172) Why ammonia is converted to uric acid crystals directly in uricotelic organisms?
question_answer173) Which of the nitrogenous waste is most soluble in water?
question_answer174) It is said that kidney helps in osmoregulation. What is osmoregulation. Explain.
question_answer175) What do you mean by artificial kidney?
question_answer176) Why storing waste products in leaves proves beneficial for the plants?
question_answer177) How unicellular organisms performs excretion?
question_answer178) From which substance urea is formed in the liver?
question_answer179) How do leaves of a plant help in excretion?
question_answer180) What are the waste materials eliminated by our body? How are they generated?
question_answer181) What happens to the glucose in the filtrate?
question_answer182) Write the function of the following (a) Renal artery (b) Renal vein
question_answer183) Which gas is produced during C photosynthesis? How is it removed from plants?
question_answer184) What will happen if there is sudden shortage of water in the body?
question_answer185) How is a working kidney dialysis machine similar to a healthy kidney?
question_answer186) Complete the labelling of the diagram.
question_answer187) Which substances are found in the glomerular filtrate in the kidneys of a mammal? (2)
question_answer188) What happens to glucose that enters along with filtrate?
question_answer189) What is the main function of kidneys in humans?
question_answer190) Observe the following table carefully and match components from part I of the table part II. Write them in complete sentences. Part I Part II (a) Unicellular organism (i) Transpiration (b) Human beings (ii) Diffusion (c) Plants (iii) Urination
question_answer191) What is the role of the following in excretion by various organisms? (a) Leaves (b) Renal artery (c) Kidney
question_answer192) (a) What is the filtering unit of kidney? (b) Why is it called so?
question_answer193) What is the function of Bowman's capsule and glomerulus in nephron?
question_answer194) (a) Write the important function of the structural and functional unit of kidney. (c) Write any one function of an artificial kidney.
question_answer195) What is excretion ? How do unicellular organisms remove their wastes ?
question_answer196) (a) What is the main toxic waste kidney filters from the blood? (b) Name any two substances which are selectively reabsorbed from the tubules of a nephron.
question_answer197) Major amount of water is selectively reabsorbed by the tubular part of nephron. On what factor does the amount of water reabsorbed depend? Or Name the factors on which the amount of water reabsorbed along the tubular part nephron depends.
question_answer198) State the functions of (a) renal artery (b) kidney (c) urinary bladder. (3)
question_answer199) Sanjeev, owner of a factory collects resins and gums from the trees of a forest for the production of certain substances. On the basis of above text answer the following questions (a) What are gums and resins? (b) What are the use of these substances? (c) What values were shown by Sanjeev?
question_answer200) Explain the location, structure and functions of kidney in human beings. Draw appropriate diagram.
question_answer201) Plants also excrete out waste from their body by various means. Justify the above statement.
question_answer202) Given below figure shows a diagram of a kidney and associated structures. The tables list the percentages of certain components found within structures A and B. In Structure A Components Concentration % Urea 0.03 Glucose 0.10 Amino acids 0.05 Salts 0.72 Proteins 8.00 In Structure B Components Concentration % Urea 2.00 Glucose 0.00 Amino acids 0.00 Salts 1.50 Proteins 0.00 (a) Using only the information in the tables in given figure deduce the functions of the kidney. (b) Explain how the proportions of the components present in B would change after eating meat and if a person suffering from diabetes.
question_answer203) Draw a neat diagram of human excretory system and label the following parts (a) Part in which urine is produced. (b) Part which stores the urine. (c) Part which connects (a) and (b). (d) Part from which urine is passed out. (d) Part which carries pure blood out of the kidney.
question_answer204) Draw a diagram of an excretory unit of a human kidney and label the following. (a) Bowman's capsule (b) Glomerulus (c) Collecting duct (d) Renal artery or Draw the structure of a nephron and label on it the following parts. (a) Glomerulus (b) Bowman's capsule (c) Renal artery (d) Collecting duct
question_answer205) (a) Name the waste products of metabolism and for each waste product, state which organ removes it from the blood. (b) Why is the removal of faeces from the alimentary canal not considered to be excretion?
question_answer206) Rohit is going to donate one of his kidney to his friend who had a kidney failure. But when doctor tested Rohit for the transplant he refused. Read the above passage and answer the following questions (a) Write the causes of kidney failure. (b) Why doctor refused for the transplant? (c) What values were shown by Rohit?
question_answer207) Some waste products of the plants are useful for human beings. Justify by giving examples.
question_answer208) What outside raw materials are used by an organism? [NCERT]
question_answer209) Why is energy required by an organism even during sleep?
question_answer210) Give the energy transformation that takes place in the process of photosynthesis.
question_answer211) What is chlorophyll?
question_answer212) Name the various factors which affect the rate of photosynthesis.
question_answer213) Define photolysis.
question_answer214) Define light reaction.
question_answer215) Define dark reaction.
question_answer216) What are peristaltic movements?
question_answer217) Which is the largest gland in the human body?
question_answer218) Give an example of an organism whose digestion is intracellular.
question_answer219) Name the various cells through which water moves upward to reach the leaves.
question_answer220) What will happen to a plant if its xylem is removed? [CBSE Delhi 2009]
question_answer221) In which chamber of heart is oxygenated and deoxygenated blood found?
question_answer222) What makes red blood corpuscles red?
question_answer223) What is the main function of kidneys in humans?
question_answer224) In which part of nephron is water reabsorbed?
question_answer225) In which region of kidney Malpighian corpuscles are found?
question_answer226) What process in plants is known as transpiration? [CBSE Delhi 2008]
question_answer227) What is urethra?
question_answer228) Which is the major nitrogenous waste product in human beings? How is it removed from the body?
question_answer229) Name the membrane covering the lungs.
question_answer230) What is osmoregulation? [CBSE (AI) 2006]
question_answer231) In which form (i) oxygen is carried to the tissues? (ii) CO2 moves out of the blood?
question_answer232) Why do the walls of trachea not collapse when there is less air in it?
question_answer233) Which part of root is involved in the exchange of respiratory gases in plants?
question_answer234) Name two organisms in which food material is broken down outside the body and absorbed.
question_answer235) What prevents backflow of blood inside the heart during contraction?
question_answer236) Which is the first enzyme to mix with food in the digestive system?
question_answer237) Why does lack of oxygen in muscles often lead to cramps among cricketers?
question_answer238) Where is pyruvic acid converted into lactic acid during deficiency of oxygen in tissues of human beings?
question_answer239) Where does the oxygen come from when it is liberated during photosynthesis?
question_answer240) What is the internal (cellular) energy reserve in autotrophs?
question_answer241) In which forms do most plants absorb nitrogen?
question_answer242) If salivary amylase is lacking in the saliva, which event in the mouth cavity will be affected?
question_answer243) What protects the inner lining of stomach from hydrochloric acid?
question_answer244) What is chyme?
question_answer245) Name the enzyme which is present in infants but may be absent in adults.
question_answer246) Why is diffusion insufficient to meet the oxygen requirements of multicellular organisms like humans? [NCERT]
question_answer247) Where do plants get each of the raw materials required for photosynthesis?
question_answer248) [NCERT, CBSE (AI) 2008] What is the function of digestive enzymes?
question_answer249) [NCERT, CBSE (AI) 2008C] How is the small intestine designed to absorb digested food? [NCERT]
question_answer250) How are the lungs designed in human beings to maximise the area for exchange of gases?
question_answer251) [NCERT, CBSE (AI) 2008] Why is it necessary to separate oxygenated and deoxygenated blood in mammals and birds? [NCERT]
question_answer252) What are the components of the transport system in highly organized plants? [NCERT]
question_answer253) How is the amount of urine produced regulated? [NCERT]
question_answer254) How are fats digested in our bodies? Where does this process take place? [NCERT]
question_answer255) How are the alveoli designed to maximize the exchange of gases? [NCERT]
question_answer256) What would be the consequence of a deficiency of hemoglobin in our body?
question_answer257) [NCERT] What is compensation point?
question_answer258) What happens to visible light of the sun when it falls on chlorophyll?
question_answer259) How does water affect the rate of photosynthesis in plants?
question_answer260) Study the given diagram: Name the parts 'A' and 'B' and state one function of each.
question_answer261) What substances are contained in the gastric juice? What are their functions?
question_answer262) What are the various processes that take place in the duodenum?
question_answer263) What is peptic ulcer? How is peptic ulcer caused?
question_answer264) How does respiration occur in the roots of the plant?
question_answer265) How does respiration occur in the leaves?
question_answer266) Explain why the rate of photosynthesis in plants is low both at lower and higher temperatures. (ii) Is green light most or least useful in photosynthesis and why? [CBSE (AI) 2005]
question_answer267) How does respiration occur in the stem of the plant?
question_answer268) What is ascent of sap?
question_answer269) What is transpiration pull?
question_answer270) What is root pressure?
question_answer271) What is the role of intercostal muscles in respiration and where are these found?
question_answer272) State the function of Bowman's capsule and glomerulus.
question_answer273) What happens to glucose which enters the nephron along with the filtrate?
question_answer274) Write down the functions of lymph nodes.
question_answer275) Why is cigarette smoking injurious to health?
question_answer276) State the function of epiglottis. [CBSE]
question_answer277) Give reasons: (i) Plants look green. (ii) The respiratory surface of earthworm is its skin. (iii) Nutrition is necessary for an organism. (iv) We boil the leaf in alcohol when we are testing it for starch.
question_answer278) Why are white blood corpuscles called soldiers of the body?
question_answer279) 35. State the functions of the following components of transport system: Blood (ii) Lymph [CBSE Delhi 2008]
question_answer280) Name the parts of the body responsible for excretion in (i) Amoeba (ii) Earthworm.
question_answer281) State differences between artery, vein and capillary.
question_answer282) What happens to the rate of breathing during vigorous exercise and why?
question_answer283) How do the guard cells regulate opening and closing of stomatal pores?
question_answer284) Two green plants are kept separately in oxygen-free containers, one in the dark and the other in continuous light. Which one will live longer? Give reasons.
question_answer285) Is 'nutrition' a necessity for an organism? Discuss.
question_answer286) In each of the following situations what happens to the rate of photosynthesis? (i) Cloudy days (ii) No rainfall in the area (iii) Good manuring in the area (iv) Stomata get blocked due to dust
question_answer287) Name the energy currency in the living organisms. When and where is it produced?
question_answer288) [NCERT Exemplar] Match the terms in Column (A) with those in Column (B): [NCERT Exemplar] Column A Column B (i) Trypsin (a) Pancreas (ii) Amylase (b) Liver (Hi) Bile (c) Gastric glands (iv) Pepsin (d) Saliva
question_answer289) Explain the statement, 'Bile does not contain any enzyme but it is essential for digestion.'
question_answer290) What criteria do we use to decide whether something is alive? [NCERT]
question_answer291) What is the difference between autotrophic nutrition and heterotrophic nutrition?
question_answer292) How is oxygen and carbon dioxide transported in human beings? [CBSE(AI)2008]
question_answer293) How are water and minerals transported in plants? [NCERT]
question_answer294) What are the common features between all the respiratory organs? Explain the mechanism of gaseous exchange between tissues and blood.
question_answer295) How is food transported in plants? [NCERT]
question_answer296) Describe the structure and functioning of nephrons. [NCERT]
question_answer297) What are the methods used by plants to get rid of excretory products? [NCERT]
question_answer298) Describe double circulation in human beings. Why is it necessary?
question_answer299) What are the differences between aerobic and anaerobic respiration? Name some organisms that use the anaerobic mode of respiration.
question_answer300) What are the differences between the transport of materials in xylem and phloem?
question_answer301) [NCERT] Compare the functioning of alveoli in the lungs and nephrons in the kidneys with respect to their structure and functioning.
question_answer302) Describe the glands involved in the digestive system.
question_answer303) Explain the nutrition process in an Amoeba. [NCERT Exemplar]
question_answer304) Give the role of liver in the human beings.
question_answer305) Distinguish between breathing and respiration.
question_answer306) (i) Describe aerobic respiration. (ii) Describe the process of anaerobic respiration
question_answer307) Describe the respiration process in human beings.
question_answer308) Describe the process of digestion of food in human beings. [CBSE (AI) 2005]
question_answer309) Describe the structure of human kidney.
question_answer310) Differentiate between blood and lymph.
question_answer311) Define the terms, 'nutrition' and 'nutrients'. List two differences between 'holozoic nutrition' and 'saprophydc nutrition'. Give two examples of each of these two types of nutrition.
question_answer312) Describe internal structure of a human heart.
question_answer313) If a plant is releasing carbon dioxide and taking in oxygen during the day, does it mean that there is no photosynthesis occurring? Justify your answer.
question_answer314) The leaves of a plant first prepare food A by photosynthesis then food A gets converted into food B. What are A and B?
question_answer315) Why do fishes die when taken out of water?
question_answer316) What would happen if green plants disappeared from the Earth?
question_answer317) Why is small intestine in herbivores longer than in carnivores?
question_answer318) Why is the rate of breathing in aquatic organisms much faster than in terrestrial organisms?
question_answer319) Why do veins have thin walls as compared to arteries?
question_answer320) Why and how does water enter continuously into the root xylem?
question_answer321) Why is more concentrated yellowish urine excreted in summers?
question_answer322) Leaves of a healthy potted plant were coated with vaseline to block the stomata. Will this plant remain healthy for long? State three reasons for your answer.
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