Question

Phloem in gymnosperms lack:

• A. Both sieve tubes and companion cells
• B. Albuminous cells and sieve cells
• C. Sieve tubes only
• D. Companion cells only

Answer 1

The correct option is A

Both sieve tubes and companion cells

The correct option is A:

Explanation of the correct answer:

1. Long, narrow, pointed tubes present in the phloem of angiosperms are called sieve tubes.
2. Companion cells are attached to the sieve tubes and regulate their activity.
3. Phloem in gymnosperms doesn't have either.
4. Instead, they have sieve cells and albuminous cells for the conduction of food material.

Explanation of the incorrect options:

Option B:

The sieve element is a sieve cell in gymnosperms and other primitive vascular plants, while the associated cell is referred to as an albuminous cell.

Option C:

Gymnosperms lack sieve tubes as well as companion cells.

Option D:

Gymnosperms lack companion cells as well as sieve tubes.

Final answer: Phloem in gymnosperms lack both sieve tubes and companion cells.