Question

Spring wood is (a) in colour & has (b) density as compared to heart wood.
A) (a)-Darker, (b)-Heavier
B) (a)-Lighter, (b)-Lower
C) (a)-Darker, (b)-Lower
D) (a)-Lighter, (b)-Heavier.

Answer 1

Hint:Springwood is produced by a plant in the spring and early summer and consists of large thin-walled xylem cells compared to summerwood. Heart wood also called as dead of three, its cells usually contain tannins or other substances.

Complete answer:
To answer this question, first, we need to know about the spring wood and heart wood. Reactivation of the cambium takes place during spring season. The cambium becomes more active during this season and forms plenty of xylem vessels with wider cavities known as spring wood. While heartwood is the dead wood from inside that usually involves the most of a cross-sectioned stem.

Now, let us find the solution from the option.
>Springwood is formed because of the continuous functioning of the vascular cambium. The vessels are wider in lumen. It is light and has low density. Heartwood is the wood that has non-functional vessels due to deposition of lignin by tyloses. It appears dark and has more density.
>Springwoods are not darker and heart woods are not heavier as all the reasons mentioned above.

Thus, the correct option is B. i.e. (a)-Lighter, (b)-Lower.

Note:Springwood is a new cambium layer notified as a brand new development season. In oak and ash, this developmental stage is constant and huge cells with thin walls are generated. They look denser or deeper in color than the summerwood which would develop after. Heart wood is known to the woody part of the tree in which the cells are not active. The color blacken is because of the availability of components like tannins and less oxygen.