Question

When we observe the lower surface of a leaf through a magnifying lens we see numerous small openings. Which of the following is the term given to such openings?

• A. Stomata
• B. Lamina
• C. Midrib
• D. Veins

Answer 1

The correct option is A

Stomata

The correct option is A.

Explanation of correct option:

1. Plants have stomata, which are tiny openings on the epidermal of their leaves.
2. Stomata have a stoma, which is a tiny pore surrounded by guard cells.
3. The turgidity in the guard cell regulates the opening one closing of stomata.
4. They help in the exchange of gases between plants and the atmosphere.
5. It regulates the rate of transpiration in plants.
6. They also help in photosynthesis by facilitating the intake of CO2 and release of oxygen.

Explanation of incorrect option:

Option B:

1. Lamina is the flattened expanded part of the leaf which is attached to the petiole.
2. Lamina is the part where photosynthesis occurs.

Option C:

1. The midrib is a central prominent vein present on the dorsal side of the leaf.
2. It gives structural support to leaves

Option C:

1. Veins in the leaf contain vascular tissue like xylem and phloem.
2. It supports the transport of food and water in plants.

Final answer: When the lower surface of a leaf is observed through a magnifying lens the numerous small openings observed are called Stomata.