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Q. No.Vascular bundles in monocotyledons are considered closed because
1. Cambium is absent
2. There are no vessels with perforations
3. Xylem is surrounded all around by phloem
4. A bundle sheath surrounds each bundle
1. Cambium is absent
2. There are no vessels with perforations
3. Xylem is surrounded all around by phloem
4. A bundle sheath surrounds each bundle
Subtopic: Activity of Cork Cambium |
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In a dicot stem, the pericycle is present on the inner side of the endodermis and:
| 1. | above the phloem, in form of semi-lunar patches of sclerenchyma |
| 2. | above the xylem, in form of semi-lunar patches of sclerenchyma |
| 3. | above the phloem, in form of semi-lunar patches of collenchyma |
| 4. | above the xylem, in form of semi-lunar patches of collenchyma |
Subtopic: Dicot Stem |
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In a dicot stem the term 'starch sheath' is used for:
| 1. | Epidermis with guard cells | 2. | Hypodermis |
| 3. | Endodermis | 4. | Pericycle |
Subtopic: Dicot Stem |
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Subtopic: Meristematic Tissue: Root Apex (OLD NCERT) |
71%
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Regarding the guard cells:
| 1. | walls away from the stomatal pores are thin and those towards the stomatal pores are thick |
| 2. | walls away from the stomatal pores are thick and those towards the stomatal pores are thin |
| 3. | chloroplasts are mostly absent |
| 4. | play no role in the regulation of opening and closing of stomata |
Subtopic: Dicot Leaf | Monocot Leaf |
83%
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All the following statements regarding the anatomy of a typical dicotyledonous root are correct except:
| 1. | Many cells of the epiblema protrude in the form of unicellular root hairs. |
| 2. | The innermost layer of the cortex is called as the endodermis. |
| 3. | Pericycle is made up of collenchymatous cells. |
| 4. | Parenchymatous conjunctive tissue lies between the xylem and phloem. |
Subtopic: Anatomy of Root |
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The type of vascular bundles shown in the given figure would most likely be seen in:
| 1. | Dicotyledonous stem | 2. | Roots |
| 3. | Monocotyledonous stem | 4. | Leaves |
Subtopic: Vascular Tissue System |
80%
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What would be true for A and B shown in the given diagram?
| 1. | A shows open stomatal aperture while B shows closed stomatal aperture |
| 2. | A shows closed stomatal aperture while B shows open stomatal aperture |
| 3. | A shows the stomata in grasses |
| 4. | B shows the stomata in grasses |
Subtopic: Epidermal Tissue System |
81%
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The meristem that helps grasses regenerate parts removed by the grazing herbivores is the:
| 1. | Shoot apical meristem | 2. | Root apical meristem |
| 3. | Intercalary meristem | 4. | Lateral meristem |
Subtopic: Meristematic Tissue:Classification (OLD NCERT) |
91%
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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 |
Subtopic: Meristematic Tissue:Classification (OLD NCERT) |
77%
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