Question

A heterosporous plant is one that
(A) Produce a gametophyte that bears both sex organs
(B) Produce microspores and megaspores giving rise to separate male and female gametophytes
(C) Is a seedless vascular plant
(D) Produces two kinds of spores, one asexually by mitosis and one by meiosis.

Answer 1

Hint: Heterosporous plants are certain pteridophytes or the seed plants. Heterosporous plants are the ones that produce two diverse sorts of spores. They are microspores and the megaspores. These spores vary in the different size and the shape and hence it is called as the heterosporous spores.

Complete answer:
It produces two diverse molded spores to separate among male and female gametophytes. A male gametophyte is known as microspores and a little in size and female gametes are known as megaspores and are bigger in size. The littler of these, the microspore, is male and the bigger megaspore is female. Microspores are haploid spores that in endosporic species contain the male gametophyte, which is conveyed to the megaspores by wind, water flows or creature vectors. Microspores are practically all non flagellated, and are in this manner not equipped for dynamic movement.

The morphology of the microspore comprises an external twofold walled structure encompassing the thick cytoplasm and focal nucleus. Megaspores possess the female gametophytes in heterosporic plants. They create archegonia that produce egg cells that are prepared by sperm of the male gametophyte starting from the microspore. This fusion of the microspore and the megaspore forms the diploid zygote that forms into the sporophyte an undeveloped organism. While heterosporous plants produce less megaspores since they are bigger than their male partners.

Hence the correct answer is OPTION(B)

Note: Heterospory prevents self-fertilization from happening in a gametophyte, yet it doesn't stop two gametophytes that started from a similar sporophyte from mating. This particular sort of self-treatment is named as sporophytic selfing, and it happens most usually among angiosperms.