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Write the hypothetical proposals put forth by Oparin and Haldane.
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What are biofertilizers? Describe their role in agriculture. Why are they preferred to chemical fertilizers?
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Which one of the following is the most accurate definition of the term ‘health’?
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In RNAi genes are silenced using ______.
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What role does an individual organism play as per Darwin's theory of natural selection?
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Describe the structure of a nucleosome.
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Mention the evolutionary significance of the Shrews
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Mention the evolutionary significance of the Lobefins
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Mention the evolutionary significance of the Homo habilis
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Mention the evolutionary significance of the Homo erectus
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Explain divergent evolution with two examples.
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Name the organic materials exine and intine of an angiosperm pollen grains are made up of. Explain the role of exine.
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Write the role of Ori and 'restriction' site in a cloning vector pBR322.
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What is gene therapy? Name the first clinical case in which it was used.
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Why does Bt toxin not kill the bacterium that produces it, but kill the insect that ingests it?
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Draw a labelled diagram of a typical anatropous ovule.
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Plenty of algal bloom is observed in a pond in your locality.
(a) Write what has caused this bloom and how does it affect the quality of water.
(b) Suggest a preventive measure.
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Describe how do 'flocs' and 'activated sludge' help in Sewage Treatment.
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Write the steps you would suggest to be undertaken to obtain a foreign-gene-product.
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Public all over India is very much concerned about the deteriorating air quality in large parts of North India. Alarmed by this situation the Resident's Welfare Association of your locality organized an awareness programme entitled "Bury not burn". They invited you, being a biology student to participate.
(a) How would you justify your arguments that promote burying and discourage burning? (Give two reasons)
(b) With the help of flow charts, one for each practice depict the chain of events that follow.
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