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Botany MCQs for NEET — Practice Questions with Answers

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In grasses leaves are exposed when bulliform cells becomes_________ and leaves curl inwards when they are _________

flaccid ,turgid

plasmolysed, turgid

turgid, flaccid

Both B and A

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Explanation

Refer NCERT, heading 6.3.6 page 94 para 2

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In onion and garlic, the leaves are

cylindrical

bifacial

unifacial

Both A and C

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Explanation

In onion and garlic there is no differentiation of upper and lower surface

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Secondary growth is because of

vascular cambium

cork cambium

lateral meristem

All of the above

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Explanation

Refer NCERT, heading 6.4 para 1, page 94

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Secondary growth is present in

stelar region

extra stelar region

Both A and B

None of these

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Explanation

Refer NCERT,heading 6.4 para 1, page 95

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Interfascicular cambium is formed from

medullary rays

intrafascicular cambium

cork cambium

pericycle

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Explanation

Refer NCERT,heading 6.4 para 1, page 95

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The cells which are formed from vascular cambium towards the centre are____________and towards the periphery are _________________

secondary xylem, secondary phloem

bast, wood

wood, bast

Both A and C

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Explanation

Refer NCERT,heading 6.4.1.2 para 1, page 95

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The secondary xylem is produced more because

cambium is more active towards the inner side

cambium is more active towards the outer side

xylem is more important than phloem

All of the above

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Explanation

Refer NCERT,heading 6.4.1.2 para 1, page 95

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The primary and secondary phloems get gradually crushed because of

continuous formation and accumulation of secondary xylem

discontinuous formation and accumulation of secondary xylem

by pressure of secondary xylem as they are continuously formed

Both A and C

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Explanation

Refer NCERT

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Primary xylem remains less or more intact towards the __________

around the centre

around the periphery

outer to the pith

Both A and C

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Explanation

Refer NCERT,heading 6.4.1.2 para 1, page 95

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Secondary medullary rays are formed from

rays initials of vascular cambium

fusiform initials of vascular cambium

Both A and B

neither fusiform initials nor ray initials

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Explanation

Refer NCERT,heading 6.4.1.2 para 1, page 95 and fusiform initials form secondary medullary rays

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