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
What is incorrect about Cycas?
| 1. | Its xylem has vessels |
| 2. | It has circinate venation |
| 3. | It does not have well organised female flower |
| 4. | Its roots possess some blue-green algae |
1. shoot apical meristem
2. position of axillary buds
3. size of leaf lamina at the node below each internode
4. intercalary meristem
The annular and spirally thickened conducting elements generally develop in the protoxylem when the root or stem is:
1. maturing
2. elongating
3. widening
4. differentiating
1. phellogen
2. periderm
3. phellem
4. phelloderm
| 1. | all tissues except epidermis and vascular bundles |
| 2. | epidermis and cortex |
| 3. | all tissues internal to endodermis |
| 4. | all tissues external to endodermis |
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