Question

Which of the following statements is incorrect about companion cell?

• A. It is a specialised parenchymatous cell.
• B. Its nucleus controls the function of sieve tube.
• C. It helps in maintaining the pressure gradient in sieve tube.
• D. It is present in all vascular plants having phloem.

Answer 1

The correct option is D It is present in all vascular plants having phloem.

Companion cells are specialized parenchyma cell, located in the phloem of flowering plants and closely associated with the development and function of a sieve-tube element. Its nucleus regulates the activity of the adjacent sieve element and to take part in loading and unloading sugar into the sieve element by maintaining pressure in sieve tube. Companion cells are present only in flowering plants but not in all vascular plants.

So, the correct answer is 'It is present in all vascular plants having phloem'.