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Assertion: Late wood has fewer xylary elements with narrow vessels.
Reason: Cambium is less active in winters.
A
Both A and R are true and R is the correct explanation of A
B
Both A and R are true but R is NOT the correct explanation of A
C
A is true but R is false
D
A is false but R is true
Explanation
In winter the cambium is less active and forms fewer xylary elements with narrow vessels (late wood).
Detailed Solution
In winter, the cambium is less active and forms fewer xylary elements that have narrow vessels, and this wood is called autumn wood or late wood.