| What do you mean by the term 'standing crop' in an ecosystem? Draw a pyramid of biomass, where a small standing crop of phytoplanktons supports a large standing crop of zooplanktons in the sea. |
| Or |
| An ecosystem can support only a limited number of trophic levels. Explain. |
| (i) What is global warming and what are the various causes of global warming? |
| (ii) What values are shown by Kalpana? |
| (i) What will you call this act of Dr. Joseph? |
| (ii) How would patenting of turmeric affect India? |
| (ii) What values are exhibited by Dr. Joseph? |
| Cell - mediated immunity plays an important role in organ transplantation. Explain. |
| Or |
| Diagrammatically trace the life cycle of a malarial parasite. |
| (i) EcoRI is a well - known restriction endonuclease. How is it named so? Give details. |
| (ii) Why is it essential to have a selectable marker in a cloning vector? |
| (i) Write the name of plant source of the drug popularly called as cocaine. |
| (ii) How do moderate and high dosage of cocaine affect the human body? |
| (iii) Cocain interferes with the transport of which neurotransmitter? |
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| (i) Give all the possible genotypes of the members 4, 5 and 6 in the pedigree chart. |
| (ii) A blood test shows that the individual 14 is a carrier of haemophilia. The member numbered as 15 got recently married to number 14. What is the probability that their first child will be a haemophilic male? |
| (i) What is MTP? |
| (ii) What is its significance? |
| (iii) Predict the role of MTP in disturbing the sex ratio of the country. |
| (i) Refer to the given figure showing transverse section of an apple. Identify the parts labelled as A, B, C and D in the diagram. |
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| (ii) State the reason behind the fact that some fruits are seedless, i.e. contain no seeds with the help of a suitable example. |
| Which process help the sperms to gain entry into female oocyte during fertilisation? Mention the significance of the point of entry of sperm. |
| Or |
| Differentiate between the following. |
| (i) Gametogenesis and embryogenesis |
| (ii) Oestrus cycle and menstrual cycler |
| All successions proceed to a similar climax community, the mesic. Explain. |
| Or |
| Write differences between the following terms |
| (i) Immigration and emigration |
| (ii) Ectomycorrhizae and endomycorrhizae |
| (iii) Population and community |
| (iv) Natality and mortality |
| (v) Predation and competition |
| Describe the Meselson and Stahl's experiment in detail. |
| Or |
| (i) Single Nucleotide Polymorphisms (SNPs) identified in human genome, can bring out revolutionary changes in biological and medical sciences. Give reason. |
| (ii) Write any four applications of Human Genome Project (HGP). |
| (iii) What was the first genetic material? Give reasons in support of your answer. |
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