Question
Biology Question on Algae
Agar-agar is obtained from which of the following?
A
Gelidium
B
Nostoc
C
Chlamyodomonas
D
Ulothrix
Answer
Gelidium
Explanation
Solution
A jelly-like substance called agar-2 (or agar), is a complex polysaccharide (phycocolloid), is extracted in water from certain sps. of red algae belonging to Gelidium, Gracillaria and Gigartima and some other genera, this is produced and stored in their cell walls along cellulose. It is gel containing galactose and sulphate. Its m.p. is 90-100?? and at lower temperature it solidifies.