Question

Assertion : Isogametes are formed in majority of sexually reproducing organisms.
Reason : Morphologically distinct type of gametes are called isogametes.
A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false.
D. If both assertion and reason are false.

Answer 1

Correct Answer - d
In some algae, the two gametes are so similar in appearance that they are called homogametes or isogametes. Therefore, it is not possible to differentiate them into male and female gametes. However, in most of sexually reproducing organisms the gametes are of two morphologically dissimilar type, hence they are known as heterogametes or anisogametes.