Question

When and where does reduction division takes place in the life cycle of a liverwort offered a gymnosperm and angiosperm?

Answer 1

Reduction divisions in the life cycle of a liverwort, a moss, a fern and agymnosperm take place during the production of spores from spore mother cells. In case of anangiosperm, the reduction division occurs during pollen grain formation from anthers and during production of embryo sac from ovule.

Answer 2

Answer:

Reduction division takes place in the following stages:

Liverworts

– Meiosis takes place in the spore mother cells of the capsule in sporangium resulting in haploid spore formation

Moss

– Meiosis occurs in spore mother cells of spore sacs in the capsule of sporangium

Fern

– sporangia are endured on sporophylls (fertile leaves). The process of meiosis occurs in spore mother cells of sporangium for the formation of haploid spores.

Gymnosperm

– meiosis occurs in microsporangia located in the microsporophylls, in the microspore mother cells for the formation of haploid pollen grains giving rise to male gametophyte

Angiosperm

– pollen grains that are formed in microspore mother cells leads to the formation of male gametophyte in the anther of the stamen. The megaspore mother cell located in the nucleus of the ovule undergoes meiosis for the formation of haploid megaspore which eventually forms the female gametophyte.