NEET 2018 · BiologyGuard cellsPrevious Year Question
Stomata in grass leaf are
Answer: (C) Dumb-bell shaped. Answer: (C) Dumb-bell shaped.
- A.Rectangular
- B.Kidney shaped
- C.Dumb-bell shaped✓
- D.Barrel shaped
Correct Answer
(C) Dumb-bell shaped
Solution & Explanation
Answer: (C) Dumb-bell shaped. Solution: Grass is a monocot, and in grasses the guard cells of the stomata are not bean-shaped as in dicots but are dumb-bell shaped (narrow in the middle, swollen at the ends). This shape lets the paired guard cells open and close the stomatal pore by changing turgor. Kidney/bean-shaped guard cells occur in dicots, while barrel-shaped cells describe endodermal cells, not guard cells. NCERT Reference: NCERT Class XI, Ch 6 Anatomy of Flowering Plants, p.72, line ~26: "In grasses, the guard cells are dumb-bell shaped."
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