PrepBharat

1. Gymnosperm posses
a) Sieve tubes
b) Companion cells
c) Albuminous cell and sieve cells
d) All of these

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2. Select the incorrect statement from the following:
a) End walls of sieve tube have sieve plates.
b) Sieve tube and companion cells are connected by pit present between common longitudinal wall.
c) Companion cells are specialized parenchymatous cells having nucleus which controls the function of sieve tubes
d) Phloem parenchyma is present in most of the monocots.

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3. The following are live components of phloem except
a) Sieve tube
b) Companion cell
c) Phloem parenchyma
d) Phloem fibre (bast fibre)

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4.The following are dead components of xylem except
a) Tracheids
b) Vessels
c) Xylem sclerenchyma (wood fibres)
d) Xylem parenchyma

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5. Select the correct statement from the following:
a) Companion cells help in maintaining pressure gradients in the sieve tubes.
b) Phloem parenchyma stores food material.
c) Bast fibres are generally absent in the primary phloem but are found in secondary phloem.
d) All of these

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6. Following are the features of phloem fibres except
a) Pointed apices
b) More elongated
c) Branched
d) Unbranched

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7. Phloem fibre, which is commercially used is actually
a) Jute
b) Flax
c) Hemp
d) All of these

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8. Select the incorrect matching:
a) Protophloem – Narrow sieve tubes
b) Metaphloem – Bigger sieve tubes
c) Gymnosperm – Albuminous cells and sieve cells
d) Gymnosperm – Vessels in xylem

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9. A mature sieve tube differs from vessel in
a) Being nearly dead
b) Lacking cytoplasm
c) Lacking a functional nucleus
d) Absence of lignified walls

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10. In pteridophyta and gymnosperms, which cells are present in place of companion cell?
a) Sclereids
b) Albuminous cells
c) Idioblasts
d) None of these

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