Question

Compare the phenomenon of fertilization of Ectocarpus and polysiphonia.​

Answer 1

Alternation of generations (also known as metagenesis) is the type of life cycle that occurs in those plants and algae in the Archaeplastida and the Heterokontophyta that have distinct haploid sexual and diploid asexual stages. In these groups, a multicellular haploid gametophyte with n chromosomes alternates with a multicellular diploid sporophyte with 2n chromosomes, made up of n pairs. A mature sporophyte produces haploid spores by meiosis, a process which reduces the number of chromosomes to half, from 2n to n.

Answer 2

Answer:

Ø The cell below the carpogonium in the carpogonial filament is called the supporting cell. Ø The fertilization in Polysiphonia is affected by the water current. Ø The non-motile male gamete (spermatium) reaches the trichogyne of the carpogonium. ... Ø After the

fertilization, the trichogyne disintegrates and falls off.