Q. No.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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Subtopic: Anatomy of Root |
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The term ‘stele’in a dicot root does not include:
| 1. | Endodermis | 2. | Pericycle |
| 3. | Vascular bundles | 4. | Pith |
Subtopic: Anatomy of Root |
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Initiation of lateral roots and vascular cambium during the secondary growth in dicot roots takes place in:
1. Epidermal cells
2. Cortex cells
3. Pericycle
4. Endodermis
1. Epidermal cells
2. Cortex cells
3. Pericycle
4. Endodermis
Subtopic: Anatomy of Root |
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Regarding endodermis of dicot roots:
1. I is correct; II is correct
2. I is incorrect; II is correct
3. I is incorrect; II is incorrect
4. I is correct; II is incorrect
| I: | It comprises a single layer of pear-shaped cells with well-developed intercellular spaces. |
| II: | The tangential as well as radial walls of the endodermal cells have a deposition of water-impermeable, waxy material suberin in the form of casparian strips. |
1. I is correct; II is correct
2. I is incorrect; II is correct
3. I is incorrect; II is incorrect
4. I is correct; II is incorrect
Subtopic: Anatomy of Root |
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Consider the given two statements:
| Assertion (A): | The presence of a casparian strip is characteristic of the endodermis in plant roots. |
| Reason (R): | The casparian strip is made up of cellulose and pectin which helps in regulating the flow of substances into the vascular tissue. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Anatomy of Root |
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As compared to a dicot root, a monocot root has
1. More abundant secondary xylem
2. Many xylem bundles
3. Inconspicuous annual rings
4. Relatively thicker periderm
Subtopic: Anatomy of Root |
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Monocot root anatomy is different from the anatomy of dicot root in all the following aspects except:
1. More developed pith
2. Polyarch vascular bundles
3. Absence of secondary growth
4. Presence of multicellular root hairs
Subtopic: Anatomy of Root |
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What will be true for the figure showing the transverse section of an angiosperm root?
I: It is a section of a dicot root.
II: Secondary growth will be well marked later in this root.
III: The vascular bundles shown are radial and polyarch.
I: It is a section of a dicot root.
II: Secondary growth will be well marked later in this root.
III: The vascular bundles shown are radial and polyarch.
| I | II | III | |
| 1. | T | T | T |
| 2. | F | F | F |
| 3. | F | F | T |
| 4. | T | T | F |
Subtopic: Anatomy of Root |
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Presence of exarch and polyarch vascular bundles is characteristically seen in:
| 1. | Monocot stem | 2. | Monocot root |
| 3. | Dicot stem | 4. | Dicot root |
Subtopic: Anatomy of Root |
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