Question

Ring porous wood is found in ________.

• A. Diospyros melanoxylon
• B. Toona ciliata
• C. Acacia catechu
• D. Mesua ferrea

Hint:

Deciduous species with distinct seasonal dormant periods (like Teak, Toon, and Mulberry) are classic examples of ring-porous woods in India, whereas evergreens are primarily diffuse-porous.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Based on the size and spatial distribution of water-transporting vessels (pores) within annual growth rings, angiosperm wood is classified into ring-porous wood and diffuse-porous wood.

Step 2: Detailed Explanation:
- In ring-porous wood, the vessels produced early in the growing season (earlywood) are significantly larger than those produced later (latewood), forming a distinct, visible ring of large pores.
- Toona ciliata (commonly known as Toon or Red Cedar) is a deciduous tree that exhibits distinct seasonal growth, resulting in the formation of clear ring-porous to semi-ring-porous wood.
- In contrast, tropical evergreen trees like Mesua ferrea (Nagkesar) and some semi-evergreen/dry-deciduous trees like Diospyros and Acacia catechu produce diffuse-porous wood, where vessels are of fairly uniform size and are distributed evenly throughout the growth ring.

Step 3: Final Answer:
Ring porous wood is found in Toona ciliata.