Question 24
How can we say that fish exhibits external fertilization?

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Solution

Female fish release eggs into water and male fish releases sperms. Sperms swim randomly in water and comes in contact with the eggs. The nucleus of the sperm moves into the egg and fuses with it. Since fertilization occurs in water, outside the female body, it is called external fertilization.

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In evolutionary terms, can we say which among bacteria, spiders, fish and chimpanzees have a ‘better’ body design? Why or why not?

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Question 09
Differentiate between internal fertilization and external fertilization.

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