Plant Kingdom Test 10

Haploid gametophyte is the dominant phase in bryophytes and in volvox. Also, in Spirogyra, the diploid Sporophyte is the dominant phase. In Papaya, the haploid gametophyte is the dominant phase.

A haplo-diplontic life cycle involves the alternation between haploid and diploid generations in an organism. In plants, the diploid sporophyte gives rise to the haploid spores through meiosis. The haplo-diplontic life cycle is observed in bryophytes and pteridophytes. Kelp, Polysiphonia are examples. 

Generally, most of the algae are haplontic whereas few others are diplontic. Fucus is one such alagae that exhibits diplontic behavior i.e. Sporophyte is the dominant phase in case of fucus.

In this life cycle both the sporophytic and gametophytic phase are multi-cellular and have independent existence. In this life cycle, the dominant phases differ. This kind of life cycle is exhibited by Pteridophytes and Bryophytes. 

Rose plant belongs to the category of Angiosperms. All angiosperms and gymnosperms exhibit diplontic life cycle i.e. Sporophyte is the dominant phase and has independent existence.

Sporophyte is the dominant phase. All spermatophytes exhibit diplontic life cycle. Gametophyte depends on the Sporophyte. Sporophyte has independent existence and can perform photosynthesis and hence can prepare their own food.

Chlamydomanas exhibits haplontic life cycle i.e. gametophyte are the dominant phase in this life cycle. In this life cycle, there is no independent existence for Sporophyte. Spores produced are haploid and divide mitotically to form Gametophyte.

Gametophytes are the dominant phase in this life cycle. Sporophytes don’t have free living existence. Spores are haploid in nature and form gametophyte by mitotic division. Zygote acts as Sporophyte that forms spores.

Angiosperms dominates land at present because it has enclosed seeds, fruits and flowers.

In monocot parallel venation and in dicot reticulate venation is present.