Question

THE HETEROSPOROUS PTERIDOPHYTE SHOW CERTAIN CHARACTERISTICS , WHICH ARE PRECURSOR TO THE SEED HABIT OF GYMNOSPERM .EXPLAIN.

Answer 1

seeds are not naked ,they are present in food .

Answer 2

Answer:

Heterospory in pteridophytes leads to the development of two different kinds of spores,i.e. microspores and megaspores. This is similar to higher plants in which male gametes are much smaller than female gametes. Another important feature is in situ development of the embryo; which is similar to the development of an embryo in higher plants. The development of an embryo inside the female gametophyte enables it to take nutrition from the female gametophyte. This is beneficial for the proper development of the embryo and gives certain survival benefits to the embryo. Thus, it can be said that heterospory in pteridophytes is a precursor to seed habit in a gymnosperm.