In dicot root the complete ring of vascular bundle is formed by

(A)conjunctive tissue

(B)pericycle

(C)Endodermis

(D)Both A and B

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In dicot root vascular cambium is _________in origin.

(A)Primary

(B)Secondary

(C)Both A and B

(D)neither primary nor secondary

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The shape of the vascular bundle is __________in the beginning and later it becomes ___________in dicot root.

(A)wavy, circular

(B)circular, wavy

(C)circular , rectangular

(D)wavy, and trapezoid

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In dicot roots, secondary phloem is formed towards the _________ and secondary xylem is formed towards the __________ by the activity of vascular cambium.

(A)periphery, centre

(B)centre, periphery

(C)innerside, outerside

(D)Both B and C

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There are _________types of medullary rays formed in dicot roots during secondary growth.

(A)one

(B)two

(C)three

(D)many

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The common medullary rays between dicot stem and root is

(A)primary medullary rays

(B)secondary medullary rays

(C)Both A and B

(D)None of the above

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Annual rings are present in

(A)dicot stem

(B)dicot root

(C)Both A and B

(D)none of these

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Secondary growth occurs in

(A)dicot root and stem of angiosperms

(B)dicot root and stem of gymnosperms

(C)monocot roots

(D)Both A and B

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Lenticels are present in

(A)stem only

(B)root only

(C)Both A and B

(D)root, stem and leaf

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The more correct function of the medullary rays in dicot roots are

(A) water conduction only

(B)food conduction only

(C)food and water conduction

(D) food and water conduction in radial direction

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