Question

Each stoma has two bean-shaped cells called

• A. palisade.
  
• B. guard cells.
  
• C. epidermis.
  
• D. chloroplast.

Answer 1

The correct option is B

guard cells.

The correct option is B.

Explanation of the correct option :

1. There are some pores present on the lower surface of leaves that help in gas exchange and transpiration.
2. These pores are known as stomata.
3. Each stoma is guarded by two bean-shaped cells known as guard cells.
4. The inner wall of the guard cell is thick while the outer wall of the guard cell is thin.

Explanation of the incorrect option :

Option A:

1. Palisade cells are the type of mesophyll cells that are present below the epidermis of a leaf.
2. There are less or no intercellular spaces found in between these cells.

Option C:

1. The epidermis is the outermost protective layer that covers the whole plant body including the leaf.
2. It is usually one-celled thick.

Option D:

Chloroplast is a cell organelle present in the cell which contains chlorophyll.

Final answer: Each stoma has two bean-shaped cells called guard cells.