Plant Kingdome - ALTERNATION OF GENERATION| NCERT concept | Neet Concept | Biology

Download My App just search - Gujarat Biology NEET PLUS on google play store

Link 👇

https://play.google.com/store/apps/details?id=co.khal.izxjj

ALTERNATION OF GENERATION .

• During the life cycle of sexually reproducing plants , there is an alternation between gamete producing haploid gametophyte and spore producing diploid sporophyte .
• Different plant groups as well as individuals representing them , differ in the following patterns :

Haplontic life cycle

• Sporophytic generation is represented by one - celled zygote . Meiosis in zygote results in the formation of haploid spores . The haploid spore forms free living gametophyte by mitosis . It is represented by many algae such as Volvox , Spirogyra and Chlamydomonas .

Diplontic life cycle

• Diploid sporophyte is dominant , photosynthetic and independent phase of the plant . The gametophytic phase is represented by the single to few - celled haploid gametophyte . 
• All seed bearing plants , i.e. , gymnosperms and angiosperms and alga Fucus and Sargassum exhibit this kind of pattern .

Haplodiplontic life cycle

• Bryophytes and pteridophytes exhibit this kind of pattern . In bryophytes , a dominant independent , photosynthetic , thalloid phase is represented by a gametophyte and it alternates with short - lived multicellular sporophyte totally or partially dependent on the gametophyte for its anchorage and nutrition .

• In pteridophytes , the diploid sporophyte is represented by a dominant , independent , photosynthetic , vascular plant body . It alternates with multicellular , saprophytic / autotrophic , independent but short - lived haploid gametophyte .
• Some algal genera such as Ectocarpus and Polysiphonia also exhibit haplodiplontic life cycle .

===== Connecting With Me For More Knowledge Of Biology =====

Download My App just search - Gujarat Biology NEET PLUS on google play store

Link 👇

https://play.google.com/store/apps/details?id=co.khal.izxjj

MANISH MEVADA

M.Sc, M.Phil, B.Ed

GUJARAT BIOLOGY NEET

NEET MATERIAL IN GUJARATI 

KNOWLEDGE ON THE WAY....................