Which of the following is true for lenticels

(A)lens shaped opening

(B) occur in most woody trees

(C)permit exchange of gases

(D)All of the above

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The function of lenticels are

(A)exchange of gases

(B)helps in transpiration

(C)helps in vegetative reproduction

(D)Both a and b

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If bark is removed then plants becomes_________ due to excess of water________

(A)thick, gain

(B)thin, loss

(C)dead, loss

(D)strong, intake

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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

Please attempt this question first.

Difficulty Level: