Pressure gradient in the sieve tubes is maintained by
(1)companion cells
(2)phloem fibres
(3)phloem parenchyma
(4)All of these
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich of the following is true for phloem parenchyma?
(1)made up of elongated, tapering cylindrical cells
(2)have dense cytoplasm and nucleus
(3)stores food material and resins, latex and mucilage
(4)All of the above
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich element of the phloem becomes dead at maturity
(1)sieve tube elements
(2)companion cells
(3)phloem parenchyma
(4)phloem fibres
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyMetaphloem contains _________sieve tubes while protophloem contains____________ sieve tubes.
(1)bigger, narrow
(2)narrow, bigger
(3)narrow, no
(4)no, bigger
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyEpidermal tissue system consists of
(1)epidermal cells
(2)stomata
(3)trichomes, root hairs
(4)All of the above
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich one is true regarding epidermis?
(1)usually single layered
(2)made up of parenchymatous cells
(3)outermost layer of the primary plant body
(4)All of the above
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyStomata is a part of which type of tissue system
(1)Epidermal tissue system
(2)Ground tissue system
(3)Vascular tissue system
(4)Both A and B
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyStomatal apparatus comprises of
(1)stomatal aperture, guard cells
(2)stomatal aperture, guard and subsidiary cells
(3)stomatal aperture and guard, subsidiary and epidermal cells
(4)stomatal aperture and subsidiary cells
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIn grasses, ____________cells are dumb-bell shaped
(1)subsidiary cells
(2)guard cells
(3)Both A and B
(4)stomatal apparatus
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe epidermal hairs of root are usually _________while of shoots are usually________
(1)unicellular, multicellular
(2)multicellular, unicellular
(3)multicellular, multicellular
(4)unicellular, unicellular
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology