Plant Kingdom Question 57
Assertion : Spirogyra shows anisogamy. Reason : Gametes are identified on the basis of their size and structure.
Options:
A) If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B) If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C) If the assertion is true but the reason is false
D) If both the assertion and reason are false
Show Answer
Answer:
Correct Answer: B
Solution:
In Spirogyra, the fusing gametes are morphologically alike but dissimilar in their behaviour.
One of the fusing pairs may be more active than the other.
The gametes of Spirogyra are distinguishable by their shape and size.
This difference in behavior is the first step towards anisogamy.
It is called physiological anisogamy.
BETA
