EVERYDAY SCIENCE

Detailed explanation-1: -Most of the algal species have the same chemical composition in the cell wall and the same photosynthetic pigment which can be chlorophyll a, b, carotenoids, etc. so, ‘ the correct option is-Natura of stored food materials in the cell’.

Detailed explanation-2: -The foundation for categorizing distinct groupings of algae into different classes is provided by these pigments. Chlorophyceae are known for having chlorophyll a and b pigments, but Phaeophyceae, Bacillariophyceae, Rhodophyceae, Fucoxanthin, and Cyanophyceae all have their own unique pigments.

Detailed explanation-3: -Algae are classified into the following groups based on their photosynthetic pigments: Chlorophyceae are green algae that contain chlorophyll a, chlorophyll b, and zeaxanthin. Phaeophyceae: Brown algae that contain chlorophyll a, chlorophyll c, beta-carotene, and xanthophyll (fucoxanthin is dominant).

Detailed explanation-4: -Hence, chlorophyll a is the pigment that is common to all of the algal classifications.

Detailed explanation-5: -The absence or presence of pigments is the prime basis for algae classification. In blue-green algae or Chlorophyceae, the existence of chlorophyll a and b give green colour to it. In brown algae or Phaeophyceae, fucoxanthin and chlorophyll a and c are found. The fucoxanthin provides the brown colour.