Which type of cavity is present within the vascular bundles of monocot stem
(1)air cavity
(2)water cavity
(3) Both A and B
(4) Food cavity
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyPrimary xylem is of two types, they are-
(1) Protoxylem and metaxylem
(2) Xylem parenchyma and xylem fibres
(3) Tracheids and vessels
(4) Simple xylem and complex xylem
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIn roots, the Protoxylem lies toward __________ and Metaxylem lies toward the _______ respectively.
1. Periphery, centre
2. Centre, periphery
3. Above, below
4. Below, 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 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 & BiologyFunction 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 & BiologyThe companion cells help in maintaining the ________ in the sieve tube.
(1) Temperature gradient
(2) Cellulose gradient
(3) Pressure gradient
(4) Ion gradient
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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 & 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 & 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 & Biology