Q.

Secondary xylem and secondary phloem in dicot stem are produced by

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a

Vascular cambium

b

Phellogen

c

Apical meristem 

d

Axillary meristem

answer is A.

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Detailed Solution

Vascular cambium cuts the cells towards pith as well as periphery. Cells that are cut towards the pith develop into secondary xylem. Cells that are cut towards the periphery develop into secondary phloem. The cambium is generally more active on the inner side than on the outer.

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