Q. No.All the following are true for trichomes except:
1.
they are usually unicellular
2.
they may be branched
3.
they may be secretory
4.
they help in prevention of water loss due to transpiration
Permanent tissues in a plant body are formed following division of cells in:
1. Primary meristems only
2. Secondary meristems only
3. Both primary and secondary meristems
4. Neither primary nor secondary meristems
In the primary stems and roots, the type of cells usually present in cortex, pith and medullary rays is:
| 1. | Parenchyma | 2. | Collenchyma |
| 3. | Sclerenchyma | 4. | Meristem |
Mesophyll cells present in the ground tissue of leaves are:
1. chloroplasts lacking thin walled cells
2. chloroplasts containing thick walled cells
3. chloroplasts containing thin walled cells
4. chloroplasts lacking thick walled cells
Open vascular bundles:
| I: | have cambium present between xylem and phloem |
| II: | possess the ability to form secondary tissues |
| III: | are rare in dicotyledonous stems |
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
All the following are examples of secondary or lateral meristems except:
| 1. | Fascicular vascular cambium | 2. | Intercalary meristem |
| 3. | Interfascicular meristem | 4. | Cork cambium |
In conjoint type of vascular bundles:
| I: | xylem and phloem are jointly situated on the same radius of vascular bundles. |
| II: | xylem is usually located on the outer side of the phloem. |
| 1. Only I is correct | 2. Only II is correct |
| 3. Both are correct | 4. Both are incorrect |
Casparian strips are:
| 1. | waxy deposition of suberin on only the tangential walls of the endodermal cells |
| 2. | waxy deposition of suberin on only the radial walls of the endodermal cells |
| 3. | waxy deposition of suberin on both tangential and radial walls of the endodermal cells |
| 4. | waxy deposition of lignin on both tangential and radial walls of the endodermal cells |
During the formation of leaves and the elongation of stem, some cells are left behind from the shoot apical meristem and constitute the:
1. Leaf primordium
2. Shoot apical meristematic zone
3. Differentiating vascular tissue
4. Axillary bud
In a dicot root, the number of patches of xylem and phloem are usually:
| 1. | 2 to 4 | 2. | 4 to 6 |
| 3. | 6 to 8 | 4. | 8 to 10 |
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