NEET 2018 · BiologyGuard cellsPrevious Year Question
Stomatal movement is not affected by
Answer: (A) O2 concentration. Answer: (A) O2 concentration.
- A.O2 concentration✓
- B.Light
- C.Temperature
- D.CO2 concentration
Correct Answer
(A) O2 concentration
Solution & Explanation
Answer: (A) O2 concentration. Solution: Opening and closing of stomata (a function of guard-cell turgidity) is regulated by light, temperature and CO2 concentration, but O2 concentration does not affect stomatal movement. Hence O2 concentration is the factor that does not influence it. NCERT Reference: NCERT Class XI, Ch 6 Anatomy of Flowering Plants, p.72, line ~28: "The guard cells possess chloroplasts and regulate the opening and closing of stomata" (guard-cell movement responds to light, temperature and CO2, not O2).
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