Q.7:- What is heterospory? Briefly comment on its significance. Give two examples.
Heterospory is a phenomenon in which two kinds of spores are borne by the same plant. These spores differ in size. The smaller one are called microspore and the bigger ones are called megaspore. Microspore produce male gametophytes and megaspores produces female gametophyte. Thus it is considered as a crucial step in evolution as it is a precursor to the seed habit.
This ultimately led to seed development in gymnosperms and angiosperms.