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Other Root Modification

Vascular camb...

Question

Vascular cambium of dicot root is purely secondary in origin and arise from

A

cells of conjuctive parenchyma just below phloem

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B

cells of pericycle just outside protoxylem

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C

cells of parenchyma between xylem and phloem

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D

More than one option is correct

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Solution

The correct option is D More than one option is correct
Vascular cambium originates or arises from the cells of pericycle just outside protoxylem and cells of conjunctive parenchyma which is present just below the phloem and cells of parenchyma between Xylem and phloem. Vascular Cambium is formed in mature dicot stems after stem elongation stops. So, the correct answer is option D more than one option is correct.

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Q. 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.

Q. Assertion :In the dicot root, the vascular cambium is secondary in origin. Reason: Secondary growth occurs in stems and roots of gymnosperms also.

Q. Identify the correct pair of statements.
(i) Pericycle parenchymatous in dicot root but sclerenchymatous in mature monocot root
(ii) Pericycle of both dicot and monocot root produces lateral roots during secondary growth
(iii) All cells of dicot root endodermis are passage cells
(iv) Xylem is produced in centripetal manner in roots of fruit bearing plants.

Q. Choose the appropriate terms for the following definitions.

Phloem, Vascular cambium, Mesophyll, Schizogenous, Dendrochronology, Aerenchyma, Velamen, Tylosis, Parenchyma, Collenchyma, Lysogenous, transfer cell

.......... lateral meristem that produces secondary phloem and secondary xylem.

Q. The formation of secondary meristems; interfascicular cambium and cork cambium from differentiated parenchyma cells is dedifferentiation.

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