Q.

Assertion (A) : Stems of dicots show secondary growth. 
Reason (R) : Vascular bundles of dicot root have cambium between xylem and phloem.

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a

A and R are true and R is not the correct explanation of A.
 

b

A is correct, R is not correct. 
 

c

A and R are true and R is the correct explanation of A.
 

d

Both A and R are not correct.

answer is A.

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Detailed Solution

NCERT CLASS-XI : Page No. 90, 94.

In dicotyledonous stems, cambium is present between phloem and xylem. Such vascular bundles because of the presence of cambium possess the ability to form secondary xylem and phloem tissues.

In the dicot root, the vascular cambium is completely secondary in origin. 

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