Q49 of 58 Page 71

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

Budding, fragmentation and regeneration are considered as asexual types of reproduction because in all these methods, only single parent takes part and forms new offspring without using gametes


The following figure shows regeneration in planaria:



The process of getting back a full organism from its body parts is called regeneration. Planaria and hydra are two organisms which can be regenerated fully from their body parts.


When the body of planaria is cut off into several parts, each part regenerates its complementary part to develop into a new individual.


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47

In the given figure, label the parts and mention their functions

uterus


1. Production of egg


2. Site of fertilization


3. Site of implantation


4. Entry of the sperms

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What would be the ratio of chromosome number between an egg and its zygote? How is the sperm genetically different from the egg?

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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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Distinguish between pollination and fertilisation. Mention the site and product of fertilisation in a flower. Draw a neat, labelled diagram of a pistil showing pollen tube growth and its entry into the ovule.