Question

Which cell does not have a perforated cell wall?

• A. Tracheids
• B. Companion cells
• C. Sieve tubes
• D. Vessels

Answer 1

The correct option is A

Tracheids

The correct option is: A

Explanation of correct option:

1. Tracheids are elongated cells with tapering ends present in the xylem of vascular plants.
2. They are a type of conductive cell.
3. They help in conducting water and minerals in plants.
4. Cell walls of tracheids have pits that allow water to flow between cells.
5. Tracheids lack perforated cell wall-like vessel components as they are single-celled.

Explanation of incorrect options:

Option B:

1. They are specialized parenchyma cells present in phloem tissue.
2. They are found connected to a sieve tube via plasmodesmata.
3. They help sieve tubes by providing them energy during food transport.
4. The formation of plasmodesmata shows the presence of pores in their cell wall.

Option C:

1. Sieve tubes are specialized conducting cells of phloem.
2. As the name says they have sieve regions on the cell wall which has pores.
3. These pores help them in connecting to adjacent cells through plasmodesmata formation.
4. They work in association with companion cells.

Option D:

1. Vessels are a type of conducting cells found in the xylem.
2. They help in conducting water in plants
3. Vessels along with the tracheids from tracheary elements of the xylem.
4. Vessels are long cells with a lignified cell wall.
5. Their cell wall has pits that have pores.
6. Tracheids also have pits but they do not contain pores.

Final answer: Tracheids do not have a perforated cell wall.