Q. No.Function of sieve tubes are controlled by
1. Nucleus of sieve tube
2. Nucleus of companion cell
3. Nucleus of parenchyma
4. No function as they are dead cells
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyPhloem parenchyma is absent in most of the
1. Dicotyledons
2. Monocotyledons
3. Desert plants
4. None of the above
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyCompanion cells are closely associated with
(1) sieve elements
(2) vessel elements
(3) trichomes
(4) guard cells
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyPhloem of gymnosperm consist of
1. Albuminous cells and Sieve cells
2. Sieve tubes and companion cells
3. Phloem parenchyma and phloem fibres
4. None of the above
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyPhloem in angiosperm is composed of
a. Sieve tube element
b. Companion cell
c. Phloem parenchyma
d. Phloem fibres
e. Tracheids
f. Vessels
1. a,b,c,d
2. b,c,d,e
3. c,d,e,f
4. None
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyPhloem fibres are made up of
1. Parenchymatous cells
2. Sclerenchymatous cells
3. Collenchymatous cells
4. None of the above
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhat is incorrect for companion cell?
1. It is specialized parenchymatous cell.
2. It helps in maintaining the pressure gradient in the sieve tubes.
3. It does not retain nucleus throughout the life.
4. It is absent in gymnosperms
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyPhloem in gymnosperms lacks:
1. Both sieve tubes and companion cells
2. Albuminous cells and sieve cells
3. Sieve tubes only
4. Companion cells only
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIdentify the incorrect statement:
1. The presence of vessels is a characteristic of angiosperms
2. In roots the primary xylem is exarch
3. Gymnosperms lack albuminous cells and sieve cells
4. Bast fibers are generally absent in primary phloem
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyResin, latex and mucilage are found in
1. Phloem parenchyma
2. Xylem parenchyma
3. Phloem pits
4. None of the above
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology
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