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All Physics Chemistry Botany Zoology

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Which one is true for phellogen

thick layer cells

narrow, thin walled and nearly rectangular cells

gives rise to phellem and phelloderm

All of the above

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Explanation

Refer NCERT,heading 6.4.2 para 1, page 96

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Incorrect match is

Phellogen = cork cambium

Phellem = Cork

Phelloderm=cortex

Phelloderm=Secondary cortex

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Explanation

Refer NCERT,heading 6.4.2 para 1, page 96

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

Cork cambium

vascular cambium

Phellogen

Both A and C

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Explanation

Refer NCERT,heading 6.4.2 para 1, page 96

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

water, suberin

water, lignin

water, wax

water, cellulose

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Explanation

Refer NCERT,heading 6.4.2 para 1, page 96

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Bark non-technically refers to tissues which lies

exterior to vascular cambium

exterior to cork cambium

exterior to primary phloem

All of the above

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Explanation

Refer NCERT,heading 6.4.2 para 1, page 97

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Complimentary cells are formed by the activity of

phellogen

phellem

phelloderm

All of these

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Explanation

Refer NCERT,heading 6.4.2 para 1, page 97

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Which of the following is true for lenticels

lens shaped opening

occur in most woody trees

permit exchange of gases

All of the above

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Explanation

Refer NCERT,heading 6.4.2 para 1, page 97

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The function of lenticels are

exchange of gases

helps in transpiration

helps in vegetative reproduction

Both a and b

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Explanation

Refer NCERT,heading 6.4.2 para 1, page 97

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

thick, gain

thin, loss

dead, loss

strong, intake

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Explanation

Refer NCERT,heading 6.4.2 para 1, page 97

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

conjunctive tissue

pericycle

Endodermis

Both A and B

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Explanation

Refer NCERT,heading 6.4.3 para 1, page 97

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