Question

Synzoospore is found in
A. Ulothrix
B. Volvox
C. Vaucheria
D. Oedogonium

Answer 1

Hint: Zoospores are large, multinucleate and multiflagellate structures. They are formed from club shaped zoosporangia which develop at the end of the side branch. It is the method of asexual reproduction in aquatic forms.

Complete answer:
Vaucheria grows in shallow freshwater or marine environments (streams, rivers, ponds). In vaucheria, both sexual and asexual reproduction occurs. Asexual reproduction occurs by the formation of zoospores, aplanospores and Akinetes. The zoospore of vaucheria is a compound structure which is formed by the failure of the protoplast within the zoosporangium to divide into uninucleate, biflagellate zoospore. It is also known as Synzoospore or conidiospores and these spores generally develop in aquatic forms of vaucheria.
When an aquatic and terrestrial species of vaucheria are exposed to low temperature, the branched filaments divide into short segments of thick, gelatinous cross walls and protoplast becomes laden with oil. These resting, multinucleate thick- walled segments are called the cysts, hypnospores or akinetes. The cyst is connected by the parent membrane of the filament, which appears like another alga Gongrosira. Thus this stage of vaucheria is also called Gongrosira stage.

Ulothrix is a member of filamentous green algae, generally found in fresh and marine water. Both sexual (by biflagellate gametes) and asexual reproduction (by aplanospores and zoospores) occurs in Ulothrix.
Volvox is a member of Chlorophyceae (green algae) and lives in freshwater habitats. Asexual reproduction occurs by the gonidia of females and sperm of males.
Oedogonium is a filamentous, free-living green algae generally found in freshwater. It reproduces asexually by fragmentation, aplanospores and zoospores.

So the correct answer is option C.

Note: The formation of synzoospore occurs only in the vaucheria. Vaucheria is a member of class Xanthophyceae (yellow-green) algae. The body of Vaucheria consists of an aseptate, tubular, irregularly branched, coenocytic filament. It is usually attached to the substratum by means branched and colourless holdfast.