Question: 103: Hydrocolloid carrageen is obtained from:
(1) Rhodophyceae only
(2) Phaeophyceae only
(3) Chlorophyceae and Phaeophyceae
(4) Phaeophyceae and Rhodophyceae
Answer: Option (1)
Explanation:
Carrageenan is a hydrocolloid obtained from red algae.
Red algae belong to the class Rhodophyceae.
Carrageenan is extracted from species such as Chondrus and Gigartina.
Phaeophyceae, or brown algae, mainly yield algin, not carrageenan.
Chlorophyceae, or green algae, do not produce carrageenan.
Therefore, hydrocolloid carrageen is obtained only from Rhodophyceae.
Hence, option (1) is the correct answer.