In Chlamydomonas, the term hologamy is applied to a mode of sexual reproduction in which

Gametes are motile.

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Gametes are holozoic.

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The young unicellular thalli directly behave as gametes.

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The gametes are differentiated into male and female.

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Solution

The correct option is C The young unicellular thalli directly behave as gametes.
The young unicellular thalli directly behave as gametes:
This type of reproduction is termed as hologamy in which direction the young thallus behaves as gamete and helps in the fertilization. Hence, In Chlamydomonas, the term hologamy is applied to a mode of sexual reproduction in which The young unicellular thalli directly behave as gametes.
So, the correct answer is "The young unicellular thalli directly behave as gametes'.

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