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Q. No.For the formation of interfascicular cambium and cork cambium the parenchyma cells first undergo:
1. Differentiation
2. Dedifferentiation
3. Redifferentiation
4. Reverse differentiation
Subtopic: Activity of Cork Cambium |
75%
From NCERT
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Which of the following will not be true for gymnosperms?
| 1. | Gymnosperms lack vessels in their xylem. |
| 2. | Gymnosperms have albuminous cells and sieve cells. |
| 3. | Gymnosperms lack sieve tubes and companion cells. |
| 4. | Gymnosperms lack secondary growth. |
Subtopic: Complex Tissue: Xylem | Complex Tissue: Phloem | Secondary Growth in Root (OLD NCERT) |
74%
From NCERT
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Match each item in Column I with one in Column II and select the correct match from the codes given:
Codes:
| Column I [Plant part] | Column II [Vascular bundle] | ||
| A | Dicot root | P | Conjoint and open |
| B | Monocot root | Q | Conjoint and closed |
| C | Dicot stem | R | Radial, exarch, 2-6 in number |
| D | Monocot stem | S | Radial, exarch, polyarch [more than 6] |
| A | B | C | D | |
| 1. | R | S | Q | P |
| 2. | R | S | P | Q |
| 3. | P | Q | R | S |
| 4. | Q | P | S | R |
Subtopic: Anatomy of Root | Dicot Stem | Monocot Stem |
83%
From NCERT
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All the following produce secondary tissues in a plant body except:
1. Fascicular vascular cambium
2. Interfascicular cambium
3. Cork-cambium
4. Intercalary meristem
1. Fascicular vascular cambium
2. Interfascicular cambium
3. Cork-cambium
4. Intercalary meristem
Subtopic: Meristematic Tissue:Classification (OLD NCERT) |
89%
From NCERT
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In a monocot stem:
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
| I: | hypodermis is collenchymatous |
| II: | vascular bundles are conjoint and closed |
| III: | phloem parenchyma is absent |
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Monocot Stem |
77%
From NCERT
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A transverse section of a plant part shows the following features:
| I: | Innermost layer of cortex has casparian strips. |
| II: | Pericycle has parenchymatous cells. |
| III: | Radially arranged two to four xylem and phloem patches. |
This transverse section must be of:
1. Dicot root
2. Monocot root
3. Dicot stem
4. Monocot stem
Subtopic: Anatomy of Root |
85%
From NCERT
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Identify the incorrect statement regarding guard cells in the epidermal tissue system?
| 1. | They enclose stomata. |
| 2. | They are bean shaped in grasses. |
| 3. | The outer walls are thin and the inner walls are highly thickened. |
| 4. | They possess chloroplasts. |
Subtopic: Epidermal Tissue System |
83%
From NCERT
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Which of the following statements about cork cambium is/are correct?
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
| I: | It usually develops in the cortex region and is a couple of layers thick. |
| II: | It cuts off cells on both sides where the inner cells differentiate into cork and the outer cells differentiate into secondary cortex. |
2. Only II
3. Both I and II
4. Neither I nor II
Subtopic: Activity of Cork Cambium |
67%
From NCERT
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Identify the incorrect statement.
| 1. | Sapwood is involved in conduction of water and minerals from root to leafs. |
| 2. | Sapwood is the innermost secondary xylem and is lighter in colour |
| 3. | Due to deposition of tannins, resins, oils etc., heart wood is dark in colour. |
| 4. | Heart wood does not conduct water but gives mechanical support. |
Subtopic: Types of Wood (OLD NCERT) |
87%
From NCERT
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Identify the correctly matched pairs regarding anatomy of a dicot root:
1. Only II and III
2. Only I, II and III
3. Only I, III and IV
4. Only II, III and IV
| I: | Epiblema | Many of the cells of epiblema protrude in the form of unicellular root hairs. |
| II: | Endodermis | The tangential as well as radial walls of the cells have a deposition of suberin in the form of casparian strips. |
| III: | Pericycle | Initiation of lateral roots and vascular cambium during the secondary growth takes place in these cells |
| IV: | Pith | Large and well developed. |
2. Only I, II and III
3. Only I, III and IV
4. Only II, III and IV
Subtopic: Anatomy of Root |
81%
From NCERT
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