A) phloem
B) cortex
C) heart wood
D) sap wood
Correct Answer: C
Solution :
As tree grows older, xylem vessels of heart wood are no longer involved in water transport and gets impregnated with organic compound like tannin, resin and oil due to which it becomes dark and increase in thickness. Cortex is commonly of thin walled parenchymatous cells that lies between endodermis and hypodermis or epidermis. Phloem is a tissue in the vascular system of plants that moves dissolved sugars and other products of photosynthesis from the leaves to other regions of the plant. Phloem tissue consists of cell called sieve tubes and companion cells. Sapwood is the layer of secondary xylem that are still functional in older woody plants, visible as the outer lighter areas in the cross section of a tree trunk.
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