In heterosporous plants microgametophytes produce sperm.
What are heterosporous plant ?
Heterosporous refers to the plants producing different types of spores that are different in structure, size and function.
What does heterosporous plant produce?
In heterosporous plants, there are two sizes of spores; the smaller (a microspore) produces a male gametophyte, and the larger (a megaspore) produces a female gametophyte.
Hence ,the correct option is B
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