(i) What are the symptoms of malaria? |
(ii) Name the commonly used hormones present in contraceptive pills. |
OR |
State any two differences between spermatogenesis and oogenesis. |
Write the various causes of genetic disorders in humans. |
OR |
Mention the salient features of Hugo de Vries theory of mutation. How do Hugo de Vries theory differs from Darwinism? |
(i) For which variety of Indian rice, patent was filed by a USA Company? |
(ii) What are biofertilisers? |
(iii) What would have happened if antibiotics were not discovered? |
(i) What essential features must be present in a cloning vehicle? |
(ii) Give each an example of vectors for cloning genes in plants and animals. |
Write notes on the following: |
(i) Food web |
(ii) Xerarch |
(i) What sense of responsibility did the Biology teacher exhibit? |
(ii) A person detected to be HIV positive should be isolated in the society. Do you agree? Why or Why not? |
(iii) How is AIDS not spread? |
Hybrid varieties of several of our food and vegetable crops are being extensively cultivated. However, plant breeders face a serious problem about their seeds. What is that and how it can be possible to solve this problem? |
OR |
Describe the changes in the following organs in the different phases of the menstrual cycle |
(i) Ovaries |
(ii) Oviducts |
(iii) Uterus. |
What is mutation? Give the names of some mutagens. How mutations are significant in agriculture? |
OR |
In man four types of blood groups A, B, AB and O are controlled by three alleles of a gene. What is the mechanism of inheritance of the blood group? |
Explain the main effects of water pollution. |
OR |
Give an account of energy flow in an ecosystem. |
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