Question

Stomata in grass leaves are

• A. Rectangular
• B. Dumb-bell shaped
• C. Barrel-shaped
• D. Kidney shaped

Answer 1

The correct option is B

Dumb-bell shaped

The correct option is B

Explanation of the correct option:

1. Stomata are tiny openings that enable the exchange of gases.
2. Stomata are usually seen in plant leaves, but in some cases, also present in stems.
3. The opening and closing of pores are regulated by guard cells.
4. The pores often close when the guard cells shrink.
5. Apart from the water vapors lost through transpiration, the exchange of gases takes place through the stomata.
6. Stomata is usually open in the daytime and closes at night time.
7. In most cases, guard cells are present in bean shape, but grass (monocot) consists of two dumbbell-shaped guard cells joined by two lateral subsidiary cells.

Explanation of the incorrect option:

Option A:

Rectangular-shaped stomata do not occur.

Option C:

Barrel-shaped stomata do not occur.

Option D:

1. In dicots, the guard cells are kidney bean shaped.
2. The inner wall of guard cell surrounding the stomata are thicker than the outer wall

Final Answer: Stomata in grass leaves are dumb-bell shaped.