Question

Which of the following is a flagellated alga?
A. Chlamydomonas
B. Ulothrix
C. Saccharomyces
D. Agaricus

Answer 1

Hint: Flagellates are those organisms that have one or more whip-like appendages or flagella. The flagellum is a long, whip-like structure composed of microtubules. They help in the locomotion of cells and organisms. It is present in green algae.

Complete answer: Chlamydomonas is a unicellular chlorophyte that can use both autotrophic and heterotrophic metabolic pathways. They use flagella for movements and for the cell to cell recognition during reproduction. Chlamydomonas has great importance in studying chloroplast dynamics and flagellar motility. So, it is used as a model organism in the laboratory. They are green algae that have two flagella, found in stagnant water, in freshwater, seawater, and on moist soil and even in the snow.
a) Ulothrix is filamentous green algae with a cosmopolitan distribution in fresh and marine water.
b) Saccharomyces is a unicellular fungus. They don't have any flagella. These organisms are also known as baker’s and brewer’s yeast. This yeast is used for fermentation and in the production of alcohol.
c) Agaricus is a fungus that has no flagella in them. It is an edible fungus which is commonly called as the mushroom. The genus has both edible as well as poisonous species. This fungus mainly grows in a humid environment.
Hence, the correct answer is option A.

Note: Most species are obligate phototrophs but C. reinhardtii and C. dysostosis are facultative heterotrophs that can grow in the dark in the presence of acetate as a carbon source. Asexual reproduction occurs by zoospores, aplanospores, etc.