Question

Tyloses thickenings are seen in

• A. Phloem cells
• B. Ray parenchyma only
• C. Collenchyma
• D. Xylem tracheids and vessels

Answer 1

The correct option is D Xylem tracheids and vessels

Tyloses are balloon-like structures produced by the xylem and ray parenchyma seen adjacent to the xylem vessels. Tyloses form naturally in heartwood and are observed in the xylem of leaves during senescence. Tyloses form in xylem vessels in response to various environmental stimuli.
Thus, the correct answer is option D.