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
The companion cells help in maintaining the ________ in the sieve tube.
1. Temperature gradient
2. Cellulose gradient
3. Pressure gradient
4. Ion gradient
Resin, latex and mucilage are found in
| 1. | Phloem parenchyma | 2. | Xylem parenchyma |
| 3. | Phloem pits | 4. | None of the above |
Phloem parenchyma is absent in most of the
1. Dicotyledons
2. Monocotyledon
3. Desert plants
4. None of the above
Phloem fibres are made up of
| 1. | Parenchymatous cells |
| 2. | Sclerenchymatous cells |
| 3. | Collenchymatous cells |
| 4. | None of the above |
Which component of Jute, Flax and Hemp are commonly used?
| 1. | Phloem fibres | 2. | Xylem fibres |
| 3. | Sieve tubes | 4. | All of the above |
Epidermis in plant is generally
1. Single layered
2. Double layered
3. Triple layered
4. Present in patches
Epidermal cells are parenchymatous with __________ amount of cytoplasm lining, the cell wall and _______ vacuole.
| 1. | Small, large | 2. | Large, small |
| 3. | Small, no | 4. | Large, no |
A waxy thick layer which prevent water loss is
1. Cuticle
2. Guard cell
3. Epidermis
4. Stomata
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