(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
e) A and R are false


 Assertion: The strobili gearing microsporophyll and microsporangia
are called male strobili
Reason:the development of pollen grains takes place within the
microsporangia

 

Dear student,
Please find below the answer:

The correct option is (b).

Cones or strobili are of two types; male strobili and female strobili. The cones bearing microsporophylls are called male cones. They bear microspores which develop into the male gametophyte, which further gives rise to pollen grains. The cones bearing megasporophylls are called female cones. They bear megaspores which develop into the female gametophyte, which bears two or more archegonia or female sex organs. 

Hope this clears your doubt.
Regards.