A) Different size of motile sex organs
B) Same size of motile sex organs
C) Morphologically different sex organs
D) Physiologically differentiated sex organs
Correct Answer: D
Solution :
Sexual reproduction in Spirogyra occurs by conjugation involving union of two gametes. The fusing gametes are similar but one is more active and passes into the other cell. This differentiation of gametes is called physiological anisogamy.
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