Pressure gradient in the sieve tubes is maintained by

(A)companion cells

(B)phloem fibres

(C)phloem parenchyma

(D)All of these

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Which of the following is true for phloem parenchyma?

(A)made up of elongated, tapering cylindrical cells

(B)have dense cytoplasm and nucleus

(C)stores food material and resins, latex and mucilage

(D)All of the above

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Phloem fibres  are

(A)also known as bast fibres

(B)made up of sclerenchymatous cells

(C)absent in primary phloem

(D)All of these

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Which element of the phloem becomes dead at maturity

(A)sieve tube elements

(B)companion cells

(C)phloem parenchyma

(D)phloem fibres

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Which element of the phloem is absent in most of the monocots?

(A)sieve tube elements

(B)companion cells

(C)phloem parenchyma

(D)phloem fibres

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Metaphloem contains _________sieve tubes while protophloem contains____________ sieve tubes.

(A)bigger, narrow

(B)narrow, bigger

(C)narrow, no

(D)no, bigger

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Find the incorrect statement

(A)The presence of vessels is the characteristic feature of angiosperms

(B)sieve tubes are present in gymnosperms

(C)The radial conduction of water takes place by the ray parenchymatous cells.

(D)Xylem fibres have highly thickened walls and obliterated central lumens

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Epidermal tissue system consists of

(A)epidermal cells

(B)stomata

(C)trichomes, root hairs

(D)All of the above

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Which one is true regarding epidermis?

(A)usually single layered

(B)made up of parenchymatous cells

(C)outermost layer of the primary plant body

(D)All of the above

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Stomata is a part of which type of tissue system

(A)Epidermal tissue system

(B)Ground tissue system

(C)Vascular tissue system

(D)Both A and B

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