The type of primary xylem when protoxylem lies towards the pith is known as

(A)endarch

(B)exarch

(C)endoexarch

(D)Both A and C

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Phloem in angiosperms is composed of

(A)sieve tube elements, companion cells, phloem parenchyma, phloem fibres

(B)sieve cells, companion cells, phloem parenchyma, phloem fibres

(C)albuminous cells, companion cells, phloem parenchyma, phloem fibres

(D)Both A and B

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Gymnosperms have

(A)albuminous cells

(B)sieve cells

(C)Both A and B

(D) comapanion cells

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A mature sieve tube elements have

(A)large vacuole

(B)peripheral cytoplasm

(C)lack nucleus

(D)All of the above

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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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