State the changes that take place in the uterus when:

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

What happens when:

1. Accidently, Planaria gets cut into many pieces?
2. Bryophyllum leaf falls on the wet soil?
3. On maturation sporangia of Rhizopus bursts?

What is placenta? State its function in human female.

Draw diagrams to explain the regeneration that takes place in each of the body parts of planaria when its body is cut into three pieces. Name any other organism in which  a similar process can be observed.

What is multiple fission? How does it occur in an organism? Explain briefly. Name one organism which exhibits this type of reproduction.

What is an organic evolution? It cannot be equated with progress. Explain with the help of a suitable example.

What is the effect of DNA copying, which is not perfectly accurate, on the reproduction process? How does the amount of DNA remain constant though each new generation is a combination of DNA copies of two individuals?

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.

List any four steps involved in sexual reproduction and write its two advantages.

Reproduction is one of the most important characteristics of living beings. Give three reasons in support of the statement.