Human Reproduction — BIOLOGY STD 12 Science — Question

A student was simulating Urey and Millers experiment to prove the origin of life. The set up used by the student is given.

1. Find out the reasons why he could not get desired results.
2. What conclusion was drawn by Urey and Miller through this experiment?
3. Compare the conclusion drawn with the theory of spontaneous generation.

Explain brood parasitism with the help of an example.

Give a brief description of the different types of biodiversity in concise words.

A doctor prescribed morphine as a sedative and pain killer to your cousin who had undergone surgery. Even after recovery, he craved for the prescribed medicine. What do you conclude about his condition, had he continued with the same medication? After appraising yourself, what measures will you suggest to him to overcome this problem? Briefly explain any two.

Study the pedigree chart given above, showing the inheritance pattern of blood groups in a family and answer the following questions:

1. Give the possible genotypes of the individuals 1 and 2.
2. Which antigen or antigens will be present on the plasma membranes of the RBCs of individuals 5 and 9?
3. Give the genotypes of the individuals 3 and 4.

What is meant by biological evolution?

What is pregnancy? Write the name of pregnancy maintaining hormone.

Write two contrivances found in selfpollinated flower.

Males in whom testes fail to descend to the scrotum are generally infertile. Why?

A large number of married couples the world over are childless. It is shocking to know that in India the female partner is often blamed for the couple being childless.

1. Why in your opinion the female partner is often blamed for such situations in India? Mention any two values that you as a biology student can promote to check this social evil.
2. State any two reasons responsible for the cause of infertility.
3. Suggest a technique that can help the couple to have a child where the problem is with the male partner.