NEET 2022 · BiologyAlgaePrevious Year Question
Hydrocolloid carrageen is obtained from
Answer: (C) Rhodophyceae only. Answer: (C) Rhodophyceae only.
- A.Chlorophyceae and Phaeophyceae
- B.Phaeophyceae and Rhodophyceae
- C.Rhodophyceae only✓
- D.Phaeophyceae only
Correct Answer
(C) Rhodophyceae only
Solution & Explanation
Answer: (C) Rhodophyceae only. Solution: Carrageen is a hydrocolloid (water-holding substance) produced by red algae (Rhodophyceae); NCERT explicitly pairs algin with brown algae and carrageen with red algae. Hence carrageen comes from Rhodophyceae only, ruling out the options that include Chlorophyceae or Phaeophyceae. NCERT Reference: Class XI Biology, Plant Kingdom, p.26, lines 10-12 — "Certain marine brown and red algae produce large amounts of hydrocolloids (water holding substances), e.g., algin (brown algae) and carrageen (red algae)".
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