Question

Which of the following is not correctly matched?
A. Chlamydomonas- Unicellular flagellated alga
B. Laminaria- Flattened leaf-like thallus
C. Chlorella- Non-filamentous non flagellated
D. Spirogyra- Filamentous structure
E. Volvox- Colonial non-flagellated

Answer 1

Hint:
Algae are single-celled plants which have chlorophyll having thallus like body organization, autotrophic and they are largely aquatic organisms. They are found in a large number of habitats including association with fungi and animals. They have a variable size.

Complete step by step answer:
Option -A- Chlamydomonas- Unicellular flagellated alga
Chlamydomonas is an alga which is single-celled organisms I.e they are unicellular. They have two apical flagella which an alga use for transduction function and movement around in a wet environment.

Option -B- Laminaria- Flattened leaf-like thallus
Laminaria is a genus of algae having 31 species which is known as brown algae. As algae have thallus like organisation I.e. They have a simple organisation without leaves, stem and roots. Laminaria is known to have a typical alga organisation with flattened leaf-like thallus.

Option -C- Chlorella- Non-filamentous non flagellated
Chlorella is a genus of green algae which is single called having no flagella in them. They are known to be non-filamentous as they do not form a thread-like huge mass on the ponds.

Option -D- Spirogyra- Filamentous structure
Spirogyra is a very common genus of green algae which floats in static water or near the surface of water bodies or in masses in the sediment as masses of green, wet, soapy like a mass of algae. Sometimes extensive masses of this alga block the dams and channels of water bodies.

Option -E- Volvox- Colonial non flagellated
Volvox is a genus of green algae, it is a type of chlorophyte. It is found in colonies of up to 50,000 cells which are spherical shaped colonies. Mature volvox colony consists of several flagella which allows them to attach to the surfaces and move in the water current. So this is an incorrect option.

So, the correct answer to this question is the option"E".

Note:
Algae reproduce by vegetative, sexual and asexual reproduction. Vegetative reproduction is using fragmentation. Asexual reproduction is by the formation of spores mostly zoospores. Their sexual mode of reproduction is by the formation of gametes and the fusion of two gametes.