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Q. No.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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The parallel venation in monocot leaves is reflected in the:
| 1. | near similar sizes of vascular bundles, including main veins, as seen in vertical sections of the leaves. |
| 2. | near similar sizes of vascular bundles, except in main veins, as seen in vertical sections of the leaves. |
| 3. | large sizes of vascular bundles in mid rib and smaller in veins, as seen in vertical sections of the leaves. |
| 4. | smaller sizes of vascular bundles in mid rib and larger in veins, as seen in vertical sections of the leaves. |
Subtopic: Monocot Leaf |
71%
From NCERT
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Bulliform cells:
| 1. | are adaxial epidermal cells in grasses that are large, empty, colourless cells and involved in folding and unfolding of leaf tissue in order to reduce overall water loss. |
| 2. | are adaxial epidermal cells in grasses that are large, empty, colourless cells and involved in regulating the opening and closing of stomata for exchange of gases. |
| 3. | are adaxial epidermal cells in dicot leaves that are filled with thick sap and involved in regulating water content in leaf. |
| 4. | are abaxial epidermal cells in dicot leaves that are similar to vacuoles and involved in storage of toxins and water. |
Subtopic: Vascular Tissue System |
85%
From NCERT
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The given figure shows the transverse section of:
| 1. | Isobilateral (Monocotyledonous) Leaf; where A is xylem and B is phloem |
| 2. | Isobilateral (Monocotyledonous) Leaf; where A is phloem and B is xylem |
| 3. | Dorsiventral (Dicotyledonous) Leaf; where A is xylem and B is phloem |
| 4. | Dorsiventral (Dicotyledonous) Leaf; where A is phloem and B is xylem |
Subtopic: Monocot Leaf |
78%
From NCERT
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How many of the given statements regarding stomata in plants are correct?
1. 2
2. 3
3. 4
4. 5
| I: | Stomata are structures present in the epidermis of leaves. |
| II: | Stomata regulate the process of transpiration and gaseous exchange. |
| III: | Each stoma is composed of two bean-shaped cells known as subsidiary cells which enclose stomatal pore. |
| IV: | In grasses, the guard cells are dumb-bell shaped. |
| V: | The inner walls of guard cells (towards the stomatal pore) are thin and the outer walls (away from the stomatal pore) are highly thickened. |
1. 2
2. 3
3. 4
4. 5
Subtopic: Epidermal Tissue System |
64%
From NCERT
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The number of correct statements regarding anatomy of dicot stems is:
1. 1
2. 2
3. 3
4. 4
| Statement I: | Hypodermis consists of a few layers of collenchymatous cells. |
| Statement II: | The cells of the endodermis are rich in protein granules. |
| Statement III: | Pericycle is in the form of semi-lunar patches of sclerenchyma. |
| Statement IV: | The ‘ring’ arrangement of vascular bundles is a characteristic of dicot stem. |
2. 2
3. 3
4. 4
Subtopic: Dicot Stem |
70%
From NCERT
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