List four categories of contraceptive methods. State in brief two advantages of adopting such preventive methods.

Name the reproductive parts of an angiosperm. Where are these parts located? Explain in brief the structure of its female reproductive parts.

What is the probability of a girl or a boy being born in a family? Justify your answer.

Name the parts A, B and C shown in the following diagram and state one function of each.

What is regeneration? Give one example of an organism that shows this process and one organism that does not. Why does regeneration not occur in the latter?

Name the two types of mammalian gametes. How are these different from each other? Name the type of reproduction they are involved in. Write the advantage of this type of reproduction.

What is implantation? Where does it take place? Mention the structure involved and its function.

Explain how, new Bryophyllum plants can be produced from the leaves of the old plant ? Illustrate your answer with the help of a labelled diagram.

State the changes that take place in the uterus when:

1. Implantation of embryo has occurred.
2. Female gamete/ egg is not fertilised.

Which is the most commonly used method of birth control.