Question

Which one of the following is not found in Gymnosperms?

• A. Sieve cells
• B. Albuminous cells
• C. Tracheids
• D. Vessels

Answer 1

The Correct Option is D

Gymnosperms are a group of seed-producing plants that includes conifers, cycads, Ginkgo, and Gnetales. They are characterized by the absence of flowers and fruits, and their seeds are not enclosed within an ovary (hence the term "gymnosperm" which means "naked seeds"). To determine what is not found in gymnosperms, let's examine the options:

1. Sieve cells: Gymnosperms possess sieve cells as part of their phloem tissue, which is responsible for the transport of nutrients.
2. Albuminous cells: These cells are found in gymnosperms and are associated with sieve cells, assisting in the transport process in the phloem.
3. Tracheids: Gymnosperms predominantly have tracheids as their water-conducting cells within the xylem tissue, making it an essential feature of these plants.
4. Vessels: Unlike angiosperms, gymnosperms generally lack vessels, which are specialized tubular cells in the xylem for efficient water transport. Some Gnetales (e.g., Ephedra) have vessel elements, but they are not a general feature of gymnosperms.

Based on the examination of these options, the correct answer is Vessels. This is because vessels are absent in most gymnosperms, whereas the other components (sieve cells, albuminous cells, and tracheids) are present.

Thus, the option not found in gymnosperms is vessels.