When is vegetative propagation used? Name any three methods of vegetative propagation.

What is DNA copying? State its importance.

Draw a diagram of the female reproductive system and explain its various parts.

1. List in tabular form two differences between binary fission and multiple fission.
2. What happens when a mature Spirogyra filament attains considerable length.

From the internet, gather information about the chromosome numbers of five animals and five plants. Correlate the number with the size of organism and answer the following questions.

1. Do larger organisms have more number of chromosomes/ cells?
2. Can organism with fewer chromosomes reproduce more easily than organisms with more number of chromosomes?
3. More the number of chromosomes/ cells greater is the DNA content. Justify.

1. Name the following:

1. Thread like non-reproductive structures present in Rhizopus.
2. 'Blobs' that develop at the tips of the non-reproductive threads in Rhizopus

2. Explain how these structures protect themselves and what is the function of the structures released from the 'blobs' in Rhizopus.

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

Any four methods of contraception used by humans. How does their use have a direct effect on the health and prosperity of the family? 

How can the reproductive health be maintained and sexually transmitted disease (STDs) be prevented?

(i) Explain the different methods of contraception
(ii) What is menstrual cycle?