Question

give reason marchantia is considered the dioecious​

Answer 1

Answer:

The terms monoecious and dioecious in homosporous plants can only refer to gametophytes. A monoecious moss species has archegonia and antheridia on the same gametophyte. A dioecious moss species produces separate male gametophytes (antheridia-bearing) and female gametophytes (archegonia-bearing). In many bryophyte species it has been shown that half of the spores from a particular sporangium produce female gametophytes and half produce male gametophytes.

This fact implies that sex determination is a consequence of the segregation of sex chromosomes, as in humans. But not all cases of dioecy result from segregating sex chromosomes. For our purposes, the important point is that, in homosporous plants, the terms monoecy and dioecy refer to gametophytes and not sporophytes.

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