Which element of the phloem becomes dead at maturity
1. sieve tube elements
2. companion cells
3. phloem parenchyma
4. phloem fibres
1. sieve tube elements
2. companion cells
3. phloem parenchyma
4. phloem fibres
Metaphloem contains _________sieve tubes while protophloem contains____________ sieve tubes.
1. bigger, narrow
2. narrow, bigger
3. narrow, no
4. no, bigger
Epidermal tissue system consists of
| 1. | epidermal cells |
| 2. | stomata |
| 3. | trichomes, root hairs |
| 4. | All of the above |
Which one is true regarding epidermis?
(1)usually single layered
(2)made up of parenchymatous cells
(3)outermost layer of the primary plant body
(4)All of the above
Stomata is a part of which type of tissue system
| 1. | Epidermal tissue system |
| 2. | Ground tissue system |
| 3. | Vascular tissue system |
| 4. | Both 1 and 2 |
Stomatal apparatus comprises of
| 1. | stomatal aperture, guard cells |
| 2. | stomatal aperture, guard and subsidiary cells |
| 3. | stomatal aperture and guard, subsidiary and epidermal cells |
| 4. | stomatal aperture and subsidiary cells |
In grasses, ____________cells are dumb-bell shaped
1. subsidiary cells
2. guard cells
3. Both A and B
4. stomatal apparatus
The epidermal hairs of root are usually _________while of shoots are usually________
| 1. | unicellular, multicellular |
| 2. | multicellular, unicellular |
| 3. | multicellular, multicellular |
| 4. | unicellular, unicellular |
Which of the following is true for trichomes
| 1. | usually multicellular |
| 2. | may be branched or unbranched |
| 3. | prevent transpirational water loss |
| 4. | All of the above |
Which one is incorrect statement
| 1. | subsidiary cells are specialised epidermal cells |
| 2. | cuticle is always present on epidermal tissue system |
| 3. | cuticle is absent in roots |
| 4. | Guard cells surround the stoma |
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