NEET 2021 · BiologyAlgaePrevious Year Question
Which of the following algae contains mannitol as reserve food material?
Answer: (C) Ectocarpus. Answer: (C) Ectocarpus.
- A.Volvox
- B.Ulothrix
- C.Ectocarpus✓
- D.Gracilaria
Correct Answer
(C) Ectocarpus
Solution & Explanation
Answer: (C) Ectocarpus. Solution: In brown algae (Phaeophyceae) food is stored as the complex carbohydrates laminarin or mannitol; Ectocarpus is a brown alga, so it contains mannitol as reserve food. Volvox and Ulothrix are green algae that store starch, while Gracilaria is a red alga that stores floridean 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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