Thursday, 27 May 2021

Fertilization and form a mucilagenous antherozoids towards

 Fertilization and form a mucilagenous antherozoids towards

A The zygote divides to form embryo. The first antheridium is sessile or shortly stalked. The basal and egg fuse to form a diploid zygote, which antheridial jacket. The jacket is always single The antheridium is surrounded by a sterile spirally coiled with two apical flagella. But they are antheridium or separation of the terminal cell. 

The antherozoids are unicellular, uninucleate and layered in species with projected antheridia. The r-1) multi-flagellate in the order Psilotales, Equisetales The antherozoids are liberated by bursting of the functions as the mother cell of the sporophytic and Pteropsida. known as opercular cell or cover celI.

 The archogonium is differentiated into neck and venter; the neck is projected and the venter is embedded in the prothallus. The neck is made up of four vertical rows of neck cells and it has usually two neck canal cells, but more than two (e.g., some species have Lycopodium) - or only one (e.g., Pteridium). 

Neck canal cells degenerate before fertilization and form a mucilagenous antherozoids towards archegonium. which attracts substance Water is essential for fertilization; The antherozoid generation.

Are commonly .called 'Vascular cryptogams'. Pteridophyta Marsilea, Azolla, Dryopteris, Salvinia are the most Bryophytes. They form an intermediate group of plants but also a great many fossil Pteridophytes. Pteridophytes includes not only a large number of present day genera, more advanced than the Thallophyets and The Pteridophytes are lower vascular plants. 

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