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Question

The given diagram represents secondary growth in a typical dicot root. In which one of the options are all the four parts A, B, C and D correctly identified?


A
A - Primary Xylem; B - Primary Phloem; C - Secondary Phloem;
D - Secondary Xylem
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B
A - Primary Phloem; B - Vascular Cambium; C - Secondary Xylem;
D - Secondary Phloem
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C
A - Vascular Cambium; B - Primary Xylem; C - Secondary Xylem;
D - Secondary Phloem
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D
A - Primary Phloem; B - Vascular Cambium; C - Secondary Phloem;
D - Secondary Xylem
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Solution

The correct option is D A - Primary Phloem; B - Vascular Cambium; C - Secondary Phloem;
D - Secondary Xylem
Given below is the correct labels:

Vascular cambium is composed meristematic cells that give rise secondary xylem and phloem during secondary growth in dicot plants. This secondary growth results in increase in the girth of the plant.

Primary phloem is formed from procambium during the primary growth of the plant. This primary growth results in increase in the length of the plant.

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