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Q. No.All the following statements regarding collenchyma in plants is true except:
1.
Occurs in layers below the epidermis in most of the dicotyledonous plants
2.
Cells are thickened at the corners due to deposition of cellulose, hemicelluloses and pectin
3.
There is considerable amount of intercellular space between cells
4.
Provide mechanical support to the growing parts of the plants
Subtopic: Simple Tissue: Chollenchyma & Sclerenchyma |
84%
From NCERT
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Palisade parenchyma:
| 1. | are prominent in isobilateral leaf |
| 2. | is abaxially placed in dorsi-ventral leaf |
| 3. | are loosely arranged oval or round cells extending to the lower epidermis in dorsi-ventral leaf |
| 4. | is made of elongated cells vertically arranged parallel to each other in dorsi-ventral leaf |
Subtopic: Dicot Leaf |
78%
From NCERT
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Which of the following is/are a correct match?
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
| I: | Bulliform cells | large, bubble-shaped epidermal cells that occur in groups on the upper surface of the leaves of many monocots. |
| II: | Lenticells | a porous tissue consisting of cells with large intercellular spaces in the periderm of the secondarily thickened organs and the bark of woody stems and roots of dicotyledonous flowering plants |
2. Only II
3. Both I and II
4. Neither I nor II
Subtopic: Monocot Leaf | Activity of Cork Cambium |
55%
From NCERT
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Both Xylem and Phloem are complex tissues. At maturity, the living component of xylem and the dead component of phloem respectively are:
1. Xylem parenchyma and Phloem parenchyma
2. Xylem parenchyma and Phloem fibres
3. Xylem fibres and Phloem fibres
4. Xylem fibres and Phloem parenchyma
1. Xylem parenchyma and Phloem parenchyma
2. Xylem parenchyma and Phloem fibres
3. Xylem fibres and Phloem fibres
4. Xylem fibres and Phloem parenchyma
Subtopic: Complex Tissue: Xylem | Complex Tissue: Phloem |
82%
From NCERT
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Consider the two statements:
| I: | Intercalary meristem is a primary meristem and contributes to the formation of the primary plant body. |
| II: | Cork cambium is a lateral meristem and produces secondary tissues. |
| 1. | Only I is correct |
| 2. | Only II is correct |
| 3. | Both I and II are correct |
| 4. | Both I and II are incorrect |
Subtopic: Meristematic Tissue:Classification (OLD NCERT) | Activity of Cork Cambium |
88%
From NCERT
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Identify the incorrect statement:
| 1. | Heart wood does not conduct water but it gives mechanical support to the stem. |
| 2. | Autumn wood or late wood has a large number of xylary elements having vessels with wider cavities. |
| 3. | Phloem fibers are generally absent in the primary phloem |
| 4. | Gymnosperms lack sieve tubes and companion cells |
Subtopic: Activity of Cork Cambium | Types of Wood (OLD NCERT) |
80%
From NCERT
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Which of the following statements is true regarding the complex tissues found in plants?
| 1. | Phloem parenchyma is absent in most of the dicotyledons |
| 2. | Vessels are the characteristic feature of gymnosperms |
| 3. | The radial conduction of water takes place by the ray parenchymatous cells |
| 4. | The first formed phloem consists of bigger sieve tubes and is referred to as protophloem |
Subtopic: Complex Tissue: Xylem |
82%
From NCERT
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What is the function of trichomes on the stems?
| 1. | They help in absorption of water and minerals. |
| 2. | They help in preventing water loss due to transpiration. |
| 3. | They help in transpiration of water, the biological process by which water is lost in the form of water vapour from the aerial parts of the plants. |
| 4. | They allow interchange of gases between the internal tissue and the atmosphere. |
Subtopic: Epidermal Tissue System |
76%
From NCERT
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The ‘ring’ arrangement of vascular bundles is a characteristic of:
1. Dicot stem
2. Monocot root
3. Dicot root
4. Monocot stem
1. Dicot stem
2. Monocot root
3. Dicot root
4. Monocot stem
Subtopic: Dicot Stem |
81%
From NCERT
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Identify the incorrect statement regarding the secondary growth seen in plants:
| 1. | Secondary growth does not occur in monocotyledons |
| 2. | The cells of secondary cortex are parenchymatous |
| 3. | Bark refers to all the tissues exterior to the vascular cambium, therefore it does not include secondary phloem |
| 4. | In the dicot root, the vascular cambium originates from the tissue located just below the phloem bundles, a portion of pericycle tissue, above the protoxylem forming a complete and continuous wavy ring, which later becomes circular |
Subtopic: Activity of Vascular Cambium (OLD NCERT) | Activity of Cork Cambium |
76%
From NCERT
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