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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 |
86%
Level 1: 80%+
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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 |
77%
Level 2: 60%+
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Gymnosperms lack:
| 1. | Secondary growth | 2. | Vessels in their xylem |
| 3. | Albuminous cells | 4. | A dominant sporophyte |
Subtopic: Complex Tissue: Xylem |
85%
Level 1: 80%+
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What is true regarding bulliform cells seen in grasses?
| 1. | they are certain adaxial epidermal cells that when flaccid make the leaves curl inwards |
| 2. | they are certain abaxial epidermal cells that when flaccid make the leaves curl inwards |
| 3. | they are certain adaxial epidermal cells that when turgid make the leaves curl inwards |
| 4. | they are certain abaxial epidermal cells that when turgid make the leaves curl inwards |
Subtopic: Monocot Leaf |
75%
Level 2: 60%+
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The description of the vascular bundle shown in the figure would be:
| 1. | Radial and closed | 2. | Conjoint and open |
| 3. | Conjoint and closed | 4. | Radial and open |
Subtopic: Vascular Tissue System |
89%
Level 1: 80%+
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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 |
74%
Level 2: 60%+
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In the transverse section of monocot stem, the highlighted portion [marked as X] is:
| 1. | Sclerenchymatous hypodermis |
| 2. | Collenchymatous hypodermis |
| 3. | Suberised casparian strip |
| 4. | Starch sheath |
Subtopic: Monocot Stem |
81%
Level 1: 80%+
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The phloem parenchyma is absent, and water-containing cavities are present within the vascular bundles in:
| 1. | Monocot roots | 2. | Dicot roots |
| 3. | Monocot stems | 4. | Dicot stems |
Subtopic: Monocot Stem |
85%
Level 1: 80%+
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Consider the given two statements:
1. Statement I is correct; Statement II is correct
2. Statement I is incorrect; Statement II is correct
3. Statement I is correct; Statement II is incorrect
4. Statement I is incorrect; Statement II is incorrect
| Statement I: | The root hairs are unicellular elongations of the epidermal cells and help absorb water and minerals from the soil. |
| Statement II: | The trichomes in the shoot system are usually multicellular, branched or unbranched, soft or stiff, may even be secretory and help in preventing water loss due to transpiration. |
1. Statement I is correct; Statement II is correct
2. Statement I is incorrect; Statement II is correct
3. Statement I is correct; Statement II is incorrect
4. Statement I is incorrect; Statement II is incorrect
Subtopic: Epidermal Tissue System |
93%
Level 1: 80%+
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Identify the correct description of the structure shown in the given figure:
| 1. | It shows stomatal apparatus of almost all plants except grasses where A represents guard cells and B represents subsidiary cells. |
| 2. | It shows stomatal apparatus of almost all plants except grasses where A represents subsidiary cells and B represents guard cells. |
| 3. | It shows stomatal apparatus of grasses where A represents subsidiary cells and B represents guard cells. |
| 4. | It shows stomatal apparatus of grasses where A represents guard cells and B represents subsidiary cells. |
Subtopic: Epidermal Tissue System |
87%
Level 1: 80%+
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