Question

Read the following statements.
A. Heartwood is durable, dark and central in position.
B. Tyloses are balloon like outgrowths of xylem parenchyma into the lumen of vessels.
C. Late wood is formed during spring season.

• A. All are correct
• B. Only A is correct
• C. Only B is incorrect
• D. Only C is incorrect

Answer 1

The correct option is D Only C is incorrect

Heartwood:
In old trees, greater part of secondary xylem (wood) is dark brown due to deposition of organic compounds. These compounds make it hard, durable and resistant to attack of insects. Such type of wood is called heartwood.

Tyloses:
These are the ballon like outgrowths of xylem parenchyma cells into the lumen of adjacent xylem vessels.

Late wood:
Late wood is formed during winter season when the cambium is less active.

Early wood is formed during spring season when the cambium is very active.

So, only statement (C) is incorrect.