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Botany MCQs for NEET — Practice Questions with Answers

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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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In dicot root vascular cambium is _________in origin.

Primary

Secondary

Both A and B

neither primary nor secondary

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Explanation

Refer NCERT,heading 6.4.3 para 1, page 97

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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.

periphery, centre

centre, periphery

innerside, outerside

Both B and C

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Explanation

Refer NCERT,heading 6.4.3 para 1, page 98, figure 6.11

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

one

two

three

many

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Explanation

primary medullary rays & secondary medullary rays are two types of medullary rays

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The common medullary rays between dicot stem and root is

primary medullary rays

secondary medullary rays

Both A and B

None of the above

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Explanation

Secondary medullary rays are common in both

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Lenticels are present in

stem only

root only

Both A and B

root, stem and leaf

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Explanation

It is also present in roots in less number.

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

water conduction only

food conduction only

food and water conduction

food and water conduction in radial direction

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Explanation

It conducts food and water conduction in radial direction

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