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
E) If the assertion is false but reason is true
Correct Answer: B
Solution :
Soon after pollination, the pollen tube elongates and it grows downward through the nucellus. It eats its way downwards gradually digesting and breaking down the tissues of the pollen chamber. The pollen tube then remains a cavity which is partly a pollen chamber and partly an archegonial chamber till the archegonia get mature. Due to these several series of process the time interval of pollination and fertilization in four months. The sperm of Cycas is multiciliate are motile. This retention of swimming sperms in Cycas is a character handed down from distant algal ancestors.
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