Q. Agar-agar, an important solidifying agent used in the culture medium, is obtained from:
NTA AbhyasNTA Abhyas 2022
Solution:
Algae have been classified into several classes, out of which three are prominent and important. The bases of classification for this diverse group are as follows:
A. Nature of pigment present in the organism (like Chlorophyll-a and chlorophyll-d are present in Rhodophyceae members and no chlorophyll-b).
B. Nature of cell wall present in the organism (like Cellulosic cell wall is found in Chlorophyceae members, whereas Algin, Cellulose is found in Phaeophyceae).
C. Presence of flagella in the gametes of the organisms. Rhodophyceae members do not possess flagella in their gametes. Chlorophyceae has 2, equal, whiplash-like flagella.
D. Nature of stored food present in the organism, like Laminarin and Mannitol is present in Phaeophyceae members.
Many algae are economically important. For example, Gelidium and Gracilaria, two Rhodophyceae members yield agar-agar, a hydrocolloid that is extensively used in plant tissue culture and biochemical research.
A. Nature of pigment present in the organism (like Chlorophyll-a and chlorophyll-d are present in Rhodophyceae members and no chlorophyll-b).
B. Nature of cell wall present in the organism (like Cellulosic cell wall is found in Chlorophyceae members, whereas Algin, Cellulose is found in Phaeophyceae).
C. Presence of flagella in the gametes of the organisms. Rhodophyceae members do not possess flagella in their gametes. Chlorophyceae has 2, equal, whiplash-like flagella.
D. Nature of stored food present in the organism, like Laminarin and Mannitol is present in Phaeophyceae members.
Many algae are economically important. For example, Gelidium and Gracilaria, two Rhodophyceae members yield agar-agar, a hydrocolloid that is extensively used in plant tissue culture and biochemical research.