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Q. No.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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In old trees the greater part of secondary xylem is dark brown and resistant to insect attack due to :
| a. | secretion of secondary metabolites and their deposition in the lumen of vessels. |
| b. | deposition of organic compounds like tannins and resins in the central layers of stem. |
| c. | deposition of suberin and aromatic substances in the outer layer of stem. |
| d. | deposition of tannins, gum, resin and aromatic substances in the peripheral layers of stem. |
| e. | presence of parenchyma cells, functionally active xylem elements and essential oils. |
Choose the correct answer from the options given below
1. (b) and (d) Only
2. (a) and (b) Only
3. (c) and (d) Only
4. (d) and (e) Only
56%
Level 3: 35%-60%
NEET - 2022
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