Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
Selaginella nearly approaches seed habit because it shows (1) heterospory (2) retention of megaspore in mega sporangium till the development of young sporophyte (3) presence of ligulate leaves (4) sexual type of reproductionA) 1, 2 and 3 are correct
B) 1 and 2 are correct
C) 2 and 4 are correct
D) 1 and 3 are correct
Correct Answer: B
Solution :
Selaginella is a heterosporous pteridophyte that nearly approaches seed habit. Heterospory (Production of spores of two different sizes and two different developmental pattersns ie, microspones and megaspores) is considered to be a prerequisite to seed formation. Besides it, Selaginella also shows retention of megaspore in the megasporagium till the development of young sporophyte which is an important step towards seed formation.
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