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Question
Assertion :Secondary growth in dicot roots occur with the help of vascular cambium and phellogen. Reason: Vascular cambium is formed from conjuctive parenchyma and part of pericycle.
Assertion :Secondary growth in dicot roots occur with the help of vascular cambium and phellogen. Reason: Vascular cambium is formed from conjuctive parenchyma and part of pericycle.
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Solution
The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
The roots of gymnosperms and most dicotyledons undergo secondary growth. Most of the dicot roots show secondary growth in thickness, similar to that of dicotyledonous stems. Some dicot roots do not show secondary growth. The secondary vascular tissue originates as a result of the cambial cavity. The phellogen gives rise to the periderm. Vascular cambium is a plant tissue located between the xylem and phloem of a vascular plant. It is made up of parenchyma cells between the vascular tissue and from the pericyle. So, the correct answer is option B.
The roots of gymnosperms and most dicotyledons undergo secondary growth. Most of the dicot roots show secondary growth in thickness, similar to that of dicotyledonous stems. Some dicot roots do not show secondary growth. The secondary vascular tissue originates as a result of the cambial cavity. The phellogen gives rise to the periderm. Vascular cambium is a plant tissue located between the xylem and phloem of a vascular plant. It is made up of parenchyma cells between the vascular tissue and from the pericyle. So, the correct answer is option B.
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