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 |
Subtopic: Â Complex Tissue: Phloem |
 94%
From NCERT
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Phloem parenchyma is absent in most of the
1. Dicotyledons
2. Monocotyledon
3. Desert plants
4. None of the above
Subtopic: Â Complex Tissue: Phloem |
 91%
From NCERT
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Companion cells are closely associated with
(1) sieve elements
(2) vessel elements
(3) trichomes
(4) guard cells
Subtopic: Â Complex Tissue: Phloem |
 93%
From NCERT
NEET - 2012
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Phloem 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 |
Subtopic: Â Complex Tissue: Phloem |
 88%
From NCERT
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Phloem 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
Subtopic: Â Complex Tissue: Phloem |
 88%
From NCERT
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Phloem fibres are made up of
| 1. | Parenchymatous cells |
| 2. | Sclerenchymatous cells |
| 3. | Collenchymatous cells |
| 4. | None of the above |
Subtopic: Â Complex Tissue: Phloem |
 82%
From NCERT
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What 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 |
Subtopic: Â Complex Tissue: Phloem |
 82%
From NCERT
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Phloem in gymnosperms lacks:
1. Both sieve tubes and companion cells
2. Albuminous cells and sieve cells
3. Sieve tubes only
4. Companion cells only
Subtopic: Â Complex Tissue: Phloem |
 82%
From NCERT
NEET - 2019
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Identify 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 |
Subtopic: Â Complex Tissue: Phloem |
 78%
From NCERT
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Resin, latex and mucilage are found in
| 1. | Phloem parenchyma | 2. | Xylem parenchyma |
| 3. | Phloem pits | 4. | None of the above |
Subtopic: Â Complex Tissue: Phloem |
 81%
From NCERT
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