In which of the following organisms, self-fertilization can be seen?
A
Fish
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B
Roundworm
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C
Earthworm
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D
Liver fluke
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Solution
The correct option is D Liver fluke The fusion of male and female gametes (sex cells) produced by the same individual is called self-fertilization. Self-fertilization occurs in bisexual organisms. Liver flukes are hermaphrodites, meaning each worm has both ovaries and testes. Thus, the correct answer is option D.