Q. No.In the dicot root, the vascular cambium originates from:
1.
Tissue located below the phloem bundles and a portion of pericycle tissue above protoxylem
2.
Cortical region
3.
Parenchyma between endodermis and pericycle
4.
Intrafascicular and interfascicular tissue in a ring
Regeneration of damaged growing grass following grazing is largely due to:
| 1. | Lateral meristem | 2. | Apical meristem |
| 3. | Intercalary meristem | 4. | Secondary meristem |
Which of the statements given below is not true about the formation of Annual Rings in trees?
| 1. | Annual rings are not prominent in trees of temperate regions. |
| 2. | Annual rings are a combination of spring wood and autumn wood produced in a year. |
| 3. | Differential activity of cambium causes light and dark bands of tissue - early and late wood respectively. |
| 4. | Activity of cambium depends upon variation in climate. |
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
Grass leaves curl inwards during very dry weather. Select the most appropriate reason from the following :
1. Tyloses in vessels
2. Closure of stomata
3. Flaccidity of bulliform cells
4. Shrinkage of air spaces in spongy mesophyll
1. bast fibers
2. sieve tubes
3. companion cells
4. sieve cells
1. Ventral meristem
2. secondary meristem
3. Primary meristem
4. All of these
1. Cucurbita
2. Salvia
3. Calotropis
4. None of these
1. Epidermal extensions
2. Hypodermis
3. Endodermis
4. Epidermal appendages
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