In plants the replacement of the outer cortical and epidermal layers when they are broken are because of the

(A)Cork cambium

(B)vascular cambium

(C)Phellogen

(D)Both A and C

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The cork is impervious to ______due to __________deposition in the cell wall.

(A)water, suberin

(B)water, lignin

(C)water, wax

(D)water, cellulose

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Bark non-technically refers to tissues which lies

(A)exterior to vascular cambium

(B)exterior to cork cambium

(C)exterior to primary phloem

(D)All of the above

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How many of the followings constitute the bark?

( secondary phloem, secondary cortex, cork cambium, complimentary cells, epidermis, periderm )

(A)6

(B)5

(C)4

(D)3

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Which of the following is true for complementary cells?

(A)thin walled and colorless

(B)parenchymatous and rounded

(C)non- suberised

(D)All of the above

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Complimentary cells are formed by the activity of

(A)phellogen

(B)phellem

(C)phelloderm

(D) All of these

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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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