Question

Opening and closing of pores is a function performed by

• A. Stomata
• B. Chlorophyll
• C. Chloroplast
• D. Guard cell​

Answer 1

The correct option is D

Guard cell​

The correct option is option D.

Explanation of correct option:

1. Guard cells are specialized plant cells in the epidermis of leaves, stems, and other organs that regulate gas exchange.
2. They grow in pairs, with a stomatal pore bridging the gap between them.
3. When water is abundant and the guard cells are turgid, the stomatal pores are the largest; when water is scarce and the guard cells become flaccid, the stomatal apertures close.

Explanation of incorrect option:

Option A:

1. A stoma, also known as a stomate, is a pore that controls the rate of gas exchange in the epidermis of leaves, stems, and other organs in botany.

Option B:

1. Chlorophyll is a group of similar green pigments found in cyanobacteria's mesosomes and algae's and plants' chloroplasts.
2. Chlorophyll allows plants to absorb light energy and perform the photosynthesis process.

Option C:

1. In plant and algal cells, a chloroplast is a plastid (membrane-bound organelle) that performs photosynthesis.
2. While liberating oxygen from water in the cells, the photosynthetic pigment chlorophyll collects energy from sunlight, transforms it, and stores it in the energy-storage molecules ATP and NADPH.

Final answer: Opening and closing of pores is a function performed by guard cells