Question

When and where does reduction division take place in the life cycle of a liverwort, a moss, a fern, a gymnosperm and an angiosperm?Ncert solutions for Class 11th Biology Chapter 3 Exercise 2

Answer 1

in liverwort the main plant body is haploid.it bears the male and female sex organ s which produce gametes these gametes fuse to form a zygote the zygote develop on the gametophyte plant body to form a sperophyte.the sporophyte is differentiated into the foot,sets and capsule.many haploid spores and produced as a result of division take place inside the capsule. in. moss _ caspule of sporophyte. , in fern_ sporangia , in. gymnosperm _ microspirangia and megasporangia in angiosperm _ anthers of the stamen and the ovary of the pistil

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.