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Q.

Choose the correct statement.

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a

Secondary phloem rays are present only in woody dicot stems but not in its roots

b

Complete vascular cambium of woody  dicot stem is secondary meristem.

c

Bark of dicot stem has all the tissues derived from cork cambium only

 cork cambium

d

Annual rings are shown by both roots and stems of temperate woody dicot trees.

answer is D.

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Detailed Solution

Secondary phloem rays are present in both roots and stems of woody dicots. Bark of dicot stem has all tissues obtained from cork cambium and only secondary phloem obtained from vascular cambium. Vascular cambium of dicot stem is partially primary meristem (fascicular cambium) and partially secondary meristem (interfascicular cambium)

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