What happens when

1. Planaria gets cut into two pieces?
2. A mature spirogyra filament attains considerable length?
3. On maturation sporangia burst?

List any two modes of asexual reproduction in animals. Under which mode of reproduction is vegetative propagation placed and why? List two advantages of vegetative propagation.

Describe the grafting method for the artificial propagation of plants with the help of labelled diagrams.

Write two examples each of sexually transmitted diseases caused by (i) virus, (ii) bacteria. Explain how the transmission of such diseases be prevented?

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?

Describe the layering method for the artificial propagation of plants. Illustrate your answer with the help of a labelled diagram. Name any five plants which are propagated by the layering method.

Explain the term "Regeneration" as used in relation to reproduction of organisms. Describe briefly how regeneration is carried out in multicellular organisms like Hydra.

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?

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

Give a few characteristics of asexual reproduction.