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(i) Where are testes located in the human males and why ? State two function of the testes. (ii) In the human female, one of the ovaries releases an egg every month. State the changes that take place if (1) the egg is fertilized, and (2) the egg is not fertilized. (iii) What is done during the surgical method in males and females to prevent pregnancy ?
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Give reasons for the following: (i) Why can a woman generally not conceive a child after 50 years of age? (ii) Polar bodies are formed during oogenesis and not during spermatogenesis.
Explain the structure of a mature embryo sac of a typical flowering plant.
How is triple fusion achieved in these plants ?
Describe the changes in the ovary and the uterus as induced by the changes in the level of pituitary and ovarian hormones during menstrual cycle in a human female.
State the changes that take place in the uterus when (i) Implantation of embryo has occurred. (ii) Female gamete is not fertilized.