(i) Why are earthworms also known as detritivores? |
(ii) What values are shown by Arun? |
(i) How would Richa convince her family about the criteria of sex - determination in humans? |
(ii) What values are shown by Richa's inlaws? |
How does pistil recognise the pollen grain of the right type? |
Or |
Why is emasculation not required in unisexual flowers during artificial hybridisation? |
Why are baculoviruses used as the biological control agents? Mention their importance in organic farming. |
Or |
The biogas plant shown below is used in rural areas for the production of biogas. |
(i) Observe the figure and label the different parts marked as A, B and C. |
(ii) Explain the working of a biogas plant. |
(i) Some animals like frog, show hibernation. |
(ii) Clownfish lives among the tentacles of sea anemone. |
(iii) Desert plants bear thick cuticle on their leaf surfaces. |
(i) State the procedure by which they were cultured? |
(ii) Also, tell which property of cell is being exploited here? |
(iii) What values are shown by Pranav and his group? |
(i) What changes do you think have taken place in pond? |
(ii) What measures would you take to stop such practice? |
(iii) What values are exhibited by the people of Jhilmil? |
(i) State the type of technique shown in the diagram and its importance. |
(ii) Identify the step occurring in the middle and its utility. |
(iii) Mention the role of tag polymerase in the technique. |
(i) What is triple fusion? What is the product of this process? Where and how does it take place? Give the name of nuclei involved in triple fusion. |
(ii) Which of the following, an endosperm or an embryo, develops first in an angiospermic seed? Give reason for the precedence. |
(iii) State the role of endosperm in mature albuminous seed |
(iv) Draw a labelled diagram of a mature dicotyledonous embryo. |
Or |
(i) With the help of a flowchart, explain the events that occur during fertilisation in humans. Also, mention the site of its occurrence. |
(ii) Successful fertilisation leads to absence of menstruation in females. Give reason. |
(i) While performing a cloning experiment on which basis you will select a vector. |
(ii) State the reason behind the fact that DNA cannot pass through the cell membrane. |
Or |
(i) What is biotechnology? What are the future critical research areas in biotechnology? |
(ii) Highlight five areas, where biotechnology has influenced our lives? |
Amit had a business of supplying the milk of catties in homes. He was disturbed with his financial condition and was not in a condition to buy a new cattle. One of his friends, advised him that he can easily increase his herd size of the desired variety by the use of MOET programme. List the different steps involved in conducting the respective programme mentioning the utility of the programme. |
Or |
(i) Mention the process of production of activated sludge during sewage treatment. |
(ii) Explain the process of production of biogas with this activated sludge with the importance of the biogas so produced in daily life. |
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