What is vegetative propagation? State two advantages and two disadvantages of this method.

Explain the mechanism of sex determination in humans.

What is a seed? What are the parts of a seed? Explain with the help of a labelled diagram.

What is contraception? Name any two methods. How does the use of these methods have a direct effect on the health and prosperity of a family? State any three points.

How can you grow money plant bv vegetative propagation?

List three distinguish features between sexual and asexual types of reproduction, in tabular form.

(i) Describe the methods of reproduction found in unicellular organism.
(ii) Explain budding in Hydra.

Write one main difference between asexual and sexual mode of reproduction. Which species is likely to have comparatively better chances of survival – the one reproducing asexually or the one reproducing sexually? Give reason to justify your answer.

On cutting the body of an organism into many pieces it was observed that many of these pieces developed as new individuals. Name the process and list two organisms in which this process may be observed. Draw a schematic diagram to illustrate the changes that are likely to be observed during the development of new individuals in any one of the organisms named.

List and explain in brief three methods of contraception.