Question

To which class space alga Chlorella belongs.
a) Cyanophyceae
b) Rhodophyceae
c) Phaeophyceae
d) Chlorophyceae

Answer 1

Chlorella is a genus of microscopic alga. These organisms are spherical in shape, around two to ten mm in diameter, and may or may not have flagella. It happens to contain the photosynthetic chemical pigments chlorophyll-a and chlorophyll-b in its plastid. Under ideal conditions it multiplies rapidly, requiring solely dioxide, water, sunlight, and a little number of minerals to breed.

Complete answer:
The algae are the flora of the microscopic world. The algae chlorella belongs to the class Chlorophyceae, which includes algae of freshwater green algae. These are aerobic microorganisms that are capable of fixing greenhouse gas from the atmosphere and further turn it into energy from sunlight and produce their own food.
The class Chlorophyceae can be divided into three categories in regard to the arrangement of flagella:
1. Volvocales, chaetophorales, chlorococcales
2. Chlorellales
3. Oedogoniales
Chlorella belongs to the category Chlorellales of the above-mentioned categories. These are important endosymbionts since they provide photosynthates to organisms like sponges, polyps, ciliates, etc in exchange for shelter inside them, hence are called photosynthates.

Thus, the correct answer is option D.

Additional information:
The word alga is taken from the Greek language which translates to inexperience. Algae play several imperative roles in refreshing the environment. They turn out gas and consume carbon dioxide. They take away nutrients and pollutants from water and stabilize sediments.
However, excessive protoctist growths cause prejudicious effects on aquatic systems. Uncontrolled growths can endanger the organisms that thrive in these systems.

Note: Algae are scarcely present in the soil and their presence in soil. Moreover, their activities are less observable in comparison to that of bacteria and fungi. Their population in soil typically ranges from one hundred to ten hundred per gram of soil.