7th Class Science Related to Competitive Exam Question Bank

done Natural Resources and Their Conservation Total Questions - 20

• question_answer1)
  Dig up a handful of garden soil and put it in a beaker. Add about 500 mL of water and shake the beaker for a little while. Now, allow the soil to settle down. In which order, the soil components will get arranged from (i) to (iv) as shown in the figure?
  A)

  (i)	(ii)	(iii)	(iv)
  Sand	Silt	Clay	Clay

  done clear
  B)

  (i)	(ii)	(iii)	(iv)
  Gravel	Sand	Humus	Humus

  done clear
  C)

  (i)	(ii)	(iii)	(iv)
  Clay	Gravel	Sand	Humus

  done clear
  D)

  (i)	(ii)	(iii)	(iv)
  Humus	Grave	Sand	Clay

  done clear
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• question_answer2)
  Which of the following statements are correct?                             

  (i) Some animals help us in keeping our environment clean. They consume dead animals and dispose them off. They are called scavengers,

  (ii) Quinine, a forest product obtained from the bark of Cinchona tree, is widely used to treat typhoid.

  (iii) Van Mahotsava is a festival of cutting down trees.

  (iv) World Forest Day is celebrated on 21st March every year.

   
  A)
  (i) and (iv) only                      done clear
  B)
  (ii) and (iii) only                       done clear
  C)
  (i) and (ii) only done clear
  D)
  (iii) and (iv) only done clear
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• question_answer3)
  The given pie charts show the composition of three types of soil samples X, Y and Z. Which of the following is correct regarding these?
  A)
   X is unable to hold water or nutrients. done clear
  B)
   Y is used for pot making. done clear
  C)
   Z provides good amount of oxygen to roots for breathing. done clear
  D)
   X is best suited for cultivation. done clear
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• question_answer4)

  Refer to the given flow chart showing flow of energy in a food chain.

  Select the correct statement regarding P, Q, R and S.

  (i) S helps in cleaning of environment as well as recycling of nutrients.

  (ii) The role of Q comes when plants and animals die.

  (iii) P operate at all levels of food chain.

  (iv) R eats other animals and get its food indirectly from P.

   
  A)
  (i) and (iv) only done clear
  B)
  (i), (iii) and (iv) only done clear
  C)
  (iii) and (iv) only done clear
  D)
  (i), (ii), (iii) and (iv) done clear
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• question_answer5)
  Read the given statements and select the correct option,                           

  Statement 1: Forests prevent soil erosion.

  Statement 2: Canopy formed by crown of leaves of forest trees reduces the force and speed of raindrops.

  A)
   Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.                    done clear
  B)
   Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. done clear
  C)
   Statement 1 is true but statement 2 is false.                           done clear
  D)
   Both statements 1 and 2 are false.  done clear
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• question_answer6)
  Consider the following statements. Select the option which correctly identifies true (T) and false (F) ones.                 

  (i) Microorganisms act upon the dead plants to produce humus.

  (ii) Autotrophs lie at the base of a food chain.

  (iii) Large scale cutting of trees is called afforestation.

  (iv) Branched part of a tree above the stem is called crown.

  A)
                 i-T                   ii-F       iii-T      iv-F      done clear
  B)
   i-T                   ii-T       iii-F      iv-T      done clear
  C)
   i-T                   ii-F      iii-F                  iv-T      done clear
  D)
   i-T                   ii-F      iii-T      iv-T      done clear
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• question_answer7)

  Direction : Refer to the given figure of water cycle and answer the following questions.

  In the given figure if (1) represents the river water, then what does (4) represent?
  A)
  Condensation             done clear
  B)
  Respiration     done clear
  C)
  Transpiration    done clear
  D)
  Precipitation   done clear
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• question_answer8)

  Direction : Refer to the given figure of water cycle and answer the following questions.

  Which of the following represents the process involved in the formation of dew?
  A)
  (2)                              done clear
  B)
  (3)                done clear
  C)
  (4)                   done clear
  D)
  (6) done clear
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• question_answer9)
  Read the following statements.

  (P) The branchy part of a tree above the trunk is known as the ____ of the tree.

  (Q) The branches of tall trees look like a roof over the other plants. This is known as ___.

  (R) The is covered with a layer of dead and decaying leaves, fruits, seeds, twigs and herbs.

  (S) In rainforests, the vegetation that grows under the shade of the canopy is known as the ____.

  Select the option that correctly fills up the blanks in any two statements.
  A)
  (Q) - Crown; (S) - Forest floor done clear
  B)
  (P) - Crown; (S) - Understorey done clear
  C)
  (Q) - Canopy; (R) - Understorey done clear
  D)
  (P) - Canopy; (R) - Forest floor done clear
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• question_answer10)
  Water is an inexhaustible, renewable resource, still there is shortage of water at many places of the world. It is because
  A)
   much water available to us is not in the usable form done clear
  B)
   97.4% of all available water is frozen in glaciers and polar ice caps done clear
  C)
   we cannot make use of water that is present in rivers and lakes done clear
  D)
   we cannot make use of rainwater. done clear
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• question_answer11)
  If the percolation rate of water of a particular soil sample is 20 mL/min, then how much time will 200 mL of water take to percolate completely into the soil?
  A)
   800 s               done clear
  B)
   600 s   done clear
  C)
   200 s           done clear
  D)
          400 s done clear
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• question_answer12)
  Saurashtra, a land with history of severe water scarcity, hostile climate, and rocky land is now self-sufficient in water availability due to the efforts of ___ who taught the local people the importance of rainwater harvesting.                            
  A)
   Rajendra Singh                    done clear
  B)
   Shamjibhai J. Antala     done clear
  C)
   Amia Ruia        done clear
  D)
                 Aabid Surti                       done clear
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• question_answer13)
  The steps of wastewater treatment plant are given below randomly.             

  (i) Wastewater is passed into sedimentation tank.

  (ii) Sludge is decomposed by anaerobic bacteria.

  (iii) Wastewater is passed through bar screens.

  (iv) Wastewater is passed to grit and sand removal tank.

  (v) Solids settle at the bottom and floatable materials are removed by skimmer.

  (vi) Aeration of water takes place.

  (vii) Disinfection of water by adding chlorine.

  Which of the following represents correct sequence of steps?
  A)
   (iii)\[\to \](iv)\[\to \](i) \[\to \](v)\[\to \](ii)\[\to \](vi)\[\to \](vii) done clear
  B)
  (iv)\[\to \](iii)\[\to \](i)\[\to \](v)\[\to \](ii)\[\to \](vi)\[\to \](vii) done clear
  C)
   (iii)\[\to \](iv)\[\to \](v)\[\to \](i)\[\to \](ii)\[\to \](vi) \[\to \](vii) done clear
  D)
   (iii)\[\to \] (iv)\[\to \] (i)\[\to \](ii)\[\to \](v)\[\to \](vi)\[\to \] (vii) done clear
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• question_answer14)
  A large area of forest was cleared by burning. Which of the following statements is/are correct regarding the consequences of this activity?

  (i) Increase in soil erosion as soil is directly exposed to wind and rain.

  (ii) The land will have more fresh air as there are lesser trees to take in oxygen.

  (iii) Wildlife will easily thrive in the cleared area because more space is available now.

  (iv) New trees will grow faster and replace the burnt forest soon as the ash of the burnt trees will make the soil more fertile.

  A)
   (i) only done clear
  B)
   (i) and (iv) only done clear
  C)
   (i), (ii) and (iv) only done clear
  D)
   (i), (ii), (iii) and (iv) done clear
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• question_answer15)
  Mr Khanna had a pond in his garden, filled with all kinds of aquatic plants. He wanted to prevent mosquitoes from breeding in the pond without harming the plants in any way. He could _______.

  (i) Add salt into the water

  (ii) Add some goldfish into the pond

  (iii) Spray a film of oil on the surface of the pond

  A)
   (i) only                        done clear
  B)
   (ii) only           done clear
  C)
          (iii) only          done clear
  D)
          (i), (ii) and (iii) done clear
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• question_answer16)

  Direction : Read the given data and select the correct option for the following questions.

  Raman carried out an experiment to find out how fast water can pass through four different types of soil. He put each type of soil in four pots with equal sized holes at the base and placed separate dishes at their bottom to collect water. He poured water in them one by one, and used a stopwatch to record the time taken for water to reach the level he had marked same in each dish. His recording is given in the table as shown below.

   

  Type of soil	W	X	Y	Z
  Time (in seconds)	40	35	62	120

  Which soil is the most suitable for a plant that thrives in wet and clayey soil?
  A)
  W                                done clear
  B)
  X                     done clear
  C)
  Y                     done clear
  D)
  Z         done clear
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• question_answer17)

  Direction : Read the given data and select the correct option for the following questions.

  Raman carried out an experiment to find out how fast water can pass through four different types of soil. He put each type of soil in four pots with equal sized holes at the base and placed separate dishes at their bottom to collect water. He poured water in them one by one, and used a stopwatch to record the time taken for water to reach the level he had marked same in each dish. His recording is given in the table as shown below.

   

  Type of soil	W	X	Y	Z
  Time (in seconds)	40	35	62	120

  What factors should Raman keep the same to ensure a fair test?

  (i) The amount of soil

  (ii) The size of the pot

  (iii) The shape of the dish

  (iv) The amount of water

   
  A)
  (iii) and (iv) only                       done clear
  B)
  (i) and (ii) only                       done clear
  C)
  (ii), (iii) and (iv) only                   done clear
  D)
  (i), (ii), (iii) and (iv)                      done clear
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• question_answer18)
  Refer to the given flow chart and identify (i), (ii), (iii) and (iv).         
  A)

  (i)	(ii)	(iii)	(iv)
  Ground water	Forest	Metal	Fossil fuel

                  done clear
  B)

  (i)	(ii)	(iii)	(iv)
  Water	Forest	Metal	Fossil fuel

                  done clear
  C)

  (i)	(ii)	(iii)	(iv)
  Water	Fossil fuel	Plastic	Forest

                  done clear
  D)

  (i)	(ii)	(iii)	(iv)
  Ground water	Fossil fuel	Metal	Forest

    done clear
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• question_answer19)
  Refer to the given diagrammatic representation of distribution of water on Earth and select the correct statements for X. Y and Z.                       

  (i) X is a persistent body of dense ice that is constantly moving under its own weight.

  (ii) Y is found below the water table and rainwater is its main source.

  (iii) Z is an important source of water to the perennial rivers.

  A)
   (i) and (ii) only done clear
  B)
   (ii) and (iii) only done clear
  C)
   (i) and (iii) only done clear
  D)
   (i), (ii) and (iii) done clear
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• question_answer20)
  Which of the following will happen if the population of snakes is increased in the given food web?
  A)
   The population of frog will increase. done clear
  B)
   The population of peacock will decrease. done clear
  C)
   There will be no effect on the population of hen. done clear
  D)
   The population of grasshopper will increase. done clear
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