NEET 2017 · BiologyAlgaePrevious Year Question
An example of colonial alga is
Answer: (B) Volvox. Answer: (B) Volvox.
- A.Chlorella
- B.Volvox✓
- C.Ulothrix
- D.Spirogyra
Correct Answer
(B) Volvox
Solution & Explanation
Answer: (B) Volvox. Solution: Among the listed green algae, Volvox is the classic colonial form (a hollow sphere of many biflagellate cells). Chlorella is unicellular, while Ulothrix and Spirogyra are filamentous, so none of these is colonial. The NCERT text explicitly cites Volvox as the colonial example contrasted with the filamentous Ulothrix and Spirogyra. NCERT Reference: Class XI Biology, Plant Kingdom, p.24, lines 28-29 — "ranging from colonial forms like Volvox and the filamentous forms like Ulothrix and Spirogyra".
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