A) morphologically different sex organs
B) physiologically differentiated sex organs
C) different sizes of motile sex organs
D) same size of motile sex organs
Correct Answer: B
Solution :
In Spirogyra, the sexual reproduction involves the fusion of two morphologically identical isogametes, and physiologically dissimilar anisogametes. This is a case of primitive anisogameter. In this the active gamete is known as the male and the passive as the female.
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