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Q. No.Which of the following is/are a correct match?
I:
Bulliform cells
large, bubble-shaped epidermal cells that occur in groups on the upper surface of the leaves of many monocots.
II:
Lenticels
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
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
Subtopic: Monocot Leaf | Activity of Cork Cambium |
57%
Level 3: 35%-60%
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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 |
Subtopic: Complex Tissue: Xylem | Complex Tissue: Phloem |
83%
Level 1: 80%+
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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: Activity of Cork Cambium |
89%
Level 1: 80%+
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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 |
79%
Level 2: 60%+
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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 |
83%
Level 1: 80%+
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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 |
78%
Level 2: 60%+
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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 |
83%
Level 1: 80%+
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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 Cork Cambium |
73%
Level 2: 60%+
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A diagram of the transverse section of a monocot leaf is given below with certain parts indicated as letters of the alphabet. Select the option which incorrectly matches the alphabet with the part it represents:
| 1. | A - Adaxial epidermis | 2. | B - Phloem |
| 3. | C - Mesophyll | 4. | D - Abaxial epidermis |
Subtopic: Monocot Leaf |
81%
Level 1: 80%+
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Read the following statements about the vascular bundles:
Choose the correct answer from the options given below:
| a. | In roots, xylem and phloem in a vascular bundle are arranged in an alternate manner along the different radii. |
| b. | Conjoint closed vascular bundles do not possess cambium. |
| c. | In open vascular bundles, cambium is present in between xylem and phloem. |
| d. | The vascular bundles of dicotyledonous stem possess endarch protoxylem. |
| e. | In monocotyledonous root, usually there are more than six xylem bundles present. |
| 1. | (a), (c), (d) and (e) only | 2. | (a), (b) and (d) only |
| 3. | (b), (c), (d) and (e) only | 4. | all statements are correct |
Subtopic: Vascular Tissue System |
65%
Level 2: 60%+
NEET - 2022
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