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:  Complex Tissue: Phloem |
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Phloem parenchyma is absent in most of the

1. Dicotyledons

2. Monocotyledons

3. Desert plants

4. None of the above

Subtopic:  Complex Tissue: Phloem |
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Companion cells are closely associated with

(1) sieve elements

(2) vessel elements

(3) trichomes

(4) guard cells

Subtopic:  Complex Tissue: Phloem |
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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:  Complex Tissue: Phloem |
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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:  Complex Tissue: Phloem |
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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:  Complex Tissue: Phloem |
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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:  Complex Tissue: Phloem |
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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:  Complex Tissue: Phloem |
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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:  Complex Tissue: Phloem |
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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:  Complex Tissue: Phloem |
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