Question

the fertile cells from which micro spores or mega spores developed is called dash​

Answer 1

Generally speaking, the megaspore, or large spore, germinates into a female gametophyte, which produces egg cells. These are fertilized by sperm produced by the male gametophyte developing from the microspore. Heterosporous plants include the following: seed plants (gymnosperms and flowering plants)

Answer 2

Answer:

Megaspores, also called macrospores, are a type of spore that is present in heterosporous plants. ... Generally speaking, the megaspore, or large spore, germinates into a female gametophyte, which produces egg cells. These are fertilized by sperm produced by the male gametophyte developing from the microspore.