Differentiate between primary and secondary succession. Provide one example of each.

Explain enzyme-replacement therapy to treat adenosine deaminase deficiency. Mention two disadvantages of this procedure.

Name and explain the type of interaction that exists in mycorrhizae and between cattle egret and cattle.

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 is childless.

A. Why in your opinion is the female partner often blamed for such situations in India? Mention any two values that you as a biology student can promote to check this social evil.

B. State any two reasons responsible for the cause of infertility.

C. Suggest a technique that can help the couple to have a child where the problem is with the male partner.

A. Explain the menstrual phase in a human female. State the levels of ovarian and pituitary hormones during this phase.

B. Why is a follicular phase in the menstrual cycle also referred as a proliferative phase? Explain.

C. Explain the events that occur in Graafian follicle at the time of ovulation and thereafter.

D. Draw a Graafian follicle and label antrum and secondary oocyte.