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

How does the reproduction process can be classified on the basis of germ cells involved?

How are the modes for reproduction different in unicellular and multicellular organisms?

State the basic requirement for sexual reproduction? Write the importance of such reproductions in nature.

What are the advantages of sexual reproduction over asexual reproduction?

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.

Why does menstruation occur?

List three techniques that have been developed to prevent pregnancy. Which one of these techniques is not meant for males? How does the use of these techniques have a direct impact on the health and prosperity of a family?

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?

1. Write the names of those parts of a flower which serve the same function as the following do in the animals:

1. Testis.
2. Sperm.
3. Ovary.
4. Egg.

2. State the function of flowers in the flowering plants.