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Q. No.Gymnosperms lack:
1.
Secondary growth
2.
Vessels in their xylem
3.
Albuminous cells
4.
A dominant sporophyte
Subtopic: Complex Tissue: Xylem |
85%
From NCERT
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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 |
76%
From NCERT
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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%
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 |
80%
From NCERT
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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 |
85%
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 |
74%
From NCERT
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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
1. Sclerenchymatous hypodermis2. Collenchymatous hypodermis
3. Suberised casparian strip
4. Starch sheath
Subtopic: Monocot Stem |
81%
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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%
From NCERT
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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%
From NCERT
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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 |
88%
From NCERT
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