Question

Which of the following statements are true :

(I) Uneven thickening of the cell walls is a characteristic of sclerenchyma.

(II) Tracheids are the chief water transporting elements in gymnosperms.

(III) Companion cells are devoid of nucleus at maturity.

• A. I , II and III
• B. II and III
• C. I and II
• D. Only II

Answer 1

The correct option is D

Only II

The correct option is D:

Explanation of the correct option :

Statement I:

1. Tracheids are hollow cells with tapering ends that are found in gymnosperms and angiosperms.
2. They have thick and lignified walls.
3. They are devoid of protoplasm and are dead.
4. Tracheids form a long row, placed one above the other, and form a continuous channel for the conduction of water and minerals from the roots to other parts of plants.
5. Hence, they are chief water transporting elements in gymnosperms.

Statement II:

Uneven thickening is a characteristic feature of collenchyma and not sclerenchyma.

Statement III:

Companion cells have a nucleus.

Final answer: The statement “Tracheids are the chief water transporting elements in gymnosperms” is true.