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Question

Intrafascicular cambium, interfascicular cambium and cork cambium constitutes?

A
Wound meristem
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B
Intercalary meristem
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C
Lateral meristem
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D
Primary meristem
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Solution

The correct option is A Primary meristem
Intrafascicular cambium is present in the vascular bundles of dicot stems. It is present in between primary xylem and primary phloem. It is a primary meristem as it is derived from embryonic meristems. It is present in the plant from the very beginning only so it is primary in origin . It produces primary xylem on inner side and primary phloem on outer side. When secondary growth takes place , the parenchyma cells lying in between the vascular bundles , at the level of intrafascicular cambium, undergo dedifferentiation and by divisions and redivisions form interfascicular cambium ( I.e in between the intrafascicular cambia of vascular bundles ). Both inter and intrafascicular cambia join together to form a continuous ring of vascular cambium which starts showing its activity. I. e it will form secondary phloem on the outer side and secondary xylem on the inner side.
So the correct option is 'primary meristem'.

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