A) morphologically differentiated 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 aninogametes. This is an advanced feature. In this, the active gamete is known as the male and the passive as the female.
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