Anatomy Of Flowering Plants Question 85
Question: In trees, the growth rings represent:
Options:
A) Primary xylem
B) Secondary xylem
C) Secondary phloem
D) Cambium
Show Answer
Answer:
Correct Answer: B
Solution:
The inside of the tree gets a new vascular cambium every year and the outside of the cambium is responsible for the formation of xylem whose function is to transport the food which is produced in the leaves to the entire parts of the tree like shoots and roots.
The inside part of the cambium is developed into phloem having larger cells with then cell walls and their function is to transport water and nutrients from the roots to the leaves of the trees.
When the trees grow in cooler temperatures the phloem is of lighter color due to the thin cell walls and in the summer season the growth of trees slows down and the walls of phloem becomes thin in order to prevent water loss.
This is responsible for the color variations inside the tree. The xylem as it ages it from the bark of the tree.
Thus, we can conclude that the formation of annual rings is due to the variations in the phloem and xylem of the tree which are formed from the cambium of the tree.
BETA
