Question

Isogamous condition with non-flagellated gametes is found in
A. Chlamydomonas
B. Spirogyra
C. Volvox.
D. Fucus

Answer 1

Isogamy may be a style of reproduction that involves gametes of similar morphology, differing generally only in allelomorph expression in one or a lot of mating-type regions. As a result each gamete looks like, they can't be classified as "male" or "female". So we have to think about this morphological analysis.

Complete step-by-step answer:
Isogamous: a condition within which the sexual cells, or gametes, are of an equivalent type and size and are usually indistinguishable from one another. Several protoctists and a few fungi have Isogamous gametes. Spirogyra, a genus of some four hundred species of free-floating alga (division Chlorophyta), found in fresh environments round the world. Named for his or her beautiful spiral chloroplasts, {spirogyra|green protoctist|chlorophyte} species are thin algae that carry with them skinny, non branching chains of cylindrical cells.
green algae species will reproduce each sexually and asexually. Asexual, or vegetative, replica happens by straightforward fragmentation of the filaments. reproduction happens by a method referred to as conjugation, within which cells of 2 filaments lying aspect by aspect are joined by outgrowths known as conjugation tubes. this permits the contents of 1 cell to fully pass into and fuse with the contents of the opposite. The ensuing consolidated cell (zygote) becomes encircled by a thick wall and overwinters, whereas the vegetative filaments die.

So, B is the correct option.

Note: Spirogyra may be a filiform charophyte inexperienced protoctist of the Zygnematales, named for the turbinate or spiral arrangement of the chloroplasts that's characteristic of the genus. It's normally found in fresh habitats, and there square measure quite four hundred species of chlorophyte within the world.