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(A) Why do organisms like algae and fung...

(A) Why do organisms like algae and fungi shift from asexual mode of reproduction to sexual mode ?
(b) What is a juvenile phase in organisms ?

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(a) Organisms like fungi and algae switch to sexual mode of reproduction just before the onset of adverse conditions because sexual reproduction would bring variation into the organisms and some variants might be able to survive in unfavourable condition.
(b) The period of growth in life of organisms before they start reproducing sexually and attain a level of maturity. It is also known as vegetative phase.
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