Question
Biology Question on Anatomy of Dicotyledonous and Monocotyledonous Plants
Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion (A): Libriform fibres are true fibres.
Reason (R): Libriform fibres develop from non-functional tracheids by reduction.
In the light of the above statements, choose the correct answer from the options given below
Both Assertion and Reason are true and Reason is the explanation of Assertion
Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
Assertion is true but Reason is false
Assertion is false but Reason is true
Assertion is true but Reason is false
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 the fibres and normal tracheids. These transitional forms are designated as fibre tracheids. A line of demarcation cannot be drawn between tracheids and fiber tracheids.