Question

Stomata in grass leaf are

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

Answer 1

The Correct Option is A

The given question asks about the shape of stomata in grass leaves. Let's explore the concept to arrive at the right answer.

Explanation:

Stomata are small openings on the surfaces of leaves and stems that allow for gas exchange. They are bordered by guard cells that regulate the opening and closing of the pore. The shape of the guard cells can vary depending on the type of plant.

In most dicotyledons, such as beans and roses, the stomata have a kidney-shaped design, meaning the guard cells are shaped like kidney beans.

However, grasses, which belong to the monocotyledon group, possess a different stomatal shape. Here, the stomata are dumb-bell shaped. The guard cells in grass leaves have a unique shape that resembles dumb-bells, with enlarged ends connected by a narrower middle section. This design helps in efficient gas exchange and water regulation, even under rigorous environmental conditions like those experienced in grassland habitats.

Conclusion:

Thus, the correct option is dumb-bell shaped for the stomata in grass leaves.

Let's briefly rule out the other options:

• Rectangular: Stomata are not shaped this way in any known plants.
• Kidney shaped: This shape is common in dicots, not monocots like grasses.
• Barrel shaped: This is not an accurate description for typical stomatal shapes.

Therefore, the correct answer is Dumb-bell shaped.