Question

what haplo-diplontic life cycle. explain with examples....

Answer 1

Heya !!!

Haplo-Diplontic lifecycle is seen in Bryophytes....

The reproductive organs grow on the sporophyte...


The egg(female gamete) of Archegonium (Female reproductive organ) fuses with the biflagellate antherozoids(male gametes) released by Antheridium(Male reproductive organ) to produce the zygote...

Zygote produces a multicellular body called sporophyte...

The sporophyte is not free living but attached to the photosynthetic gametophyte and derives nutrition from it ...some cells of the sporophyte called spore mother cells undergo reduction division to produce haploid spores.These spores germinate to produce gametophyte...

All the Bryophytes are homosporpus...

They show heteromorphic alternation of generations and thus the life cycle is haplo-diplontic...


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Answer 2

$\huge{Answer:}$

$Haplo-Diplontic\:Life\:Cycle:-$

1) It is an intermediate type of life cycle, where both the sporophyte and gametophyte are multicellular, equally dominant and often free-living. Bryophytes and pteridophytes exhibit this pattern.

2) In Bryophytes, the dominant phase is the independent, photosynthetic, thalloid or erect haploid gametophyte and it alternates with the short-lived multicellular sporophyte totally or partially dependent on the gametophyte for its anchorage and nutrition.

3) In pteridophytes, the dominant phase is represented by the sporophyte which is diploid, independent, photosynthetic vascular plant body. It alternates with multicellular, independent but short-lived haploid gametophyte.

4) Algae exhibit haplontic life cycle but some of them such as Ectocarpus, Polysiphonia, Kelps are haplo-diplontic.

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