Write two points of difference between asexual and sexual types of reproduction. Describe why variations are observed in the offspring formed by sexual reproduction.

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(a)

Distinguish between a gamete and zygote. Explain their roles in sexual reproduction.

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What are various ways to avoid pregnancy? Elaborate any one method.

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How does fertilisation take place? Fertilisation occurs once in a month. Comment.

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What is the placenta? Mention its role during pregnancy?

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Describe sexually transmitted diseases and mention the ways to prevent them.

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Reproduction is essentially a phenomenon that is not survival of an individual but for the stability of a species. Justify.

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(a)Identify A, B and C in the given diagram and write their functions.
(b)Mention the role of gamete and zygote in sexually reproducing organisms.

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Why are budding, fragmentation and regeneration all considered as asexual types of reproduction? With neat diagrams explain the process of regeneration in Planaria.

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(a) Name the parts labelled as A,B,C and D in the diagram given below:

(b) What is pollination? State its significance.
(c) How does fertilisation occur in flowers? Name the parts of the floower that develop into 
(i) seed, and (ii) fruit after fertilisation.

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(a)