NEET 2023 Phase 2 · BiologyAlgaePrevious Year Question
Which of the following is incorrectly matched?
Answer: (B) Ulothrix - Mannitol. Answer: (B) Ulothrix - Mannitol.
- A.Ectocarpus - Fucoxanthin
- B.Ulothrix - Mannitol✓
- C.Porphyra - Floridian Starch
- D.Volvox - Starch
Correct Answer
(B) Ulothrix - Mannitol
Solution & Explanation
Answer: (B) Ulothrix - Mannitol. Solution: Ulothrix is a green alga (Chlorophyceae) and its stored food is starch, not mannitol; mannitol is the reserve carbohydrate of brown algae (Phaeophyceae), so the Ulothrix–Mannitol pairing is incorrect. The other pairs are correct: Ectocarpus (Phaeophyceae) bears the pigment fucoxanthin, Porphyra (Rhodophyceae) stores floridean starch, and Volvox (Chlorophyceae) stores starch. NCERT Reference: Class XI Biology, Plant Kingdom, p.27, lines 3-4 — "Food is stored as complex carbohydrates, which may be in the form of laminarin or mannitol".
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