A) (A) and (R) are true and (R) .is the explanation for
B) (A) and (R) are true but (R) is not the explanation for
C) (A) is true but (R) is false
D) (A) is false but (R) is true
Correct Answer: C
Solution :
When the fibres possess very thick walls and reduced simple pits they are known as libriform wood fibres because of their similarity to phloem fibres. Libriform wood fibres chiefly occur in woody dicotyledons. There are many transitional forms between fibres and normal tracheids, these transitional forms are designated as fiber tracheids. A line of demarcation cannot be drawn between tracheids and fibre tracheids.
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