Q. Assertion : Algae show only anisogamous type of reproduction.
Reason : In algae, gametes can never be non flagellated.

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Solution:

Sexual reproduction in algae takes place through fusion of two gametes. These gametes can be flagellated and similar in size (as in Chlamydomonas) or non-flagellated (nonmotile) but similar in size (as in Spirogyra). Such reproduction is called isogamous.