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Q. No.The main function of the companion cell in angiosperms is:
1. To provide mechanical strength to the phloem
2. To conduct water and minerals.
3. To regulate the metabolic activity of the enucleated sieve tube element
4. To store ergastic substances like resin and gum.
1. To provide mechanical strength to the phloem
2. To conduct water and minerals.
3. To regulate the metabolic activity of the enucleated sieve tube element
4. To store ergastic substances like resin and gum.
Subtopic: Complex Tissue: Phloem |
81%
Level 1: 80%+
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While studying the anatomy of a plant organ, you observe the following: collateral and open vascular bundles arranged in a ring, and a distinct cortex, endodermis, pericycle, and pith. This transverse section is definitely from
1. A monocot stem
2. A dicot stem
3. A monocot root
4. A dicot root
1. A monocot stem
2. A dicot stem
3. A monocot root
4. A dicot root
Subtopic: Dicot Stem |
73%
Level 2: 60%+
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Collenchyma is a living mechanical tissue that provides tensile strength and contains lignified cell walls.
1. True
2. False
1. True
2. False
Subtopic: Simple Tissue: Chollenchyma & Sclerenchyma |
Level 3: 35%-60%
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In a dicot root, the vascular cambium originates from:
| 1. | Only pericycle |
| 2. | Only conjunctive tissue |
| 3. | Both pericycle and conjunctive tissue |
| 4. | Endodermis and pericycle |
Subtopic: Anatomy of Root |
Level 4: Below 35%
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In a dicot root, the vascular cambium originates from which combination of tissues?
1. Conjunctive tissue between xylem and phloem, and tissue internal to endodermis
2. Cortical cells adjacent to endodermis, and pith cells in the centre of the stele
3. Pericycle cells lying below the protoxylem, and parenchyma between xylem and phloem
4. Medullary rays between vascular bundles, and cells derived from procambium
1. Conjunctive tissue between xylem and phloem, and tissue internal to endodermis
2. Cortical cells adjacent to endodermis, and pith cells in the centre of the stele
3. Pericycle cells lying below the protoxylem, and parenchyma between xylem and phloem
4. Medullary rays between vascular bundles, and cells derived from procambium
Subtopic: Anatomy of Root |
Level 3: 35%-60%
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Which statement correctly describes the differences between adaxial and abaxial surfaces of a dorsiventral leaf?
1. Adaxial epidermis has more stomata and less prominent cuticle compared to abaxial epidermis
2. Adaxial epidermis has fewer stomata and more prominent cuticle compared to abaxial epidermis
3. Adaxial epidermis lacks chloroplasts while abaxial epidermis contains abundant chloroplasts
4. Adaxial epidermis has loosely arranged cells while abaxial epidermis has compactly arranged cells
1. Adaxial epidermis has more stomata and less prominent cuticle compared to abaxial epidermis
2. Adaxial epidermis has fewer stomata and more prominent cuticle compared to abaxial epidermis
3. Adaxial epidermis lacks chloroplasts while abaxial epidermis contains abundant chloroplasts
4. Adaxial epidermis has loosely arranged cells while abaxial epidermis has compactly arranged cells
Subtopic: Dicot Leaf |
75%
Level 2: 60%+
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Which feature distinguishes vessels from tracheids in xylem tissue?
1. Vessels have lignified walls while tracheids have cellulosic walls
2. Vessels are unicellular structures while tracheids are multicellular tubes
3. Vessels have perforations in their end walls while tracheids lack such perforations
4. Vessels are living at maturity while tracheids are dead at functional maturity
1. Vessels have lignified walls while tracheids have cellulosic walls
2. Vessels are unicellular structures while tracheids are multicellular tubes
3. Vessels have perforations in their end walls while tracheids lack such perforations
4. Vessels are living at maturity while tracheids are dead at functional maturity
Subtopic: Complex Tissue: Xylem |
77%
Level 2: 60%+
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The vascular bundles in a monocot stem are described as scattered and closed because:
1. They are randomly distributed and lack cambium between xylem and phloem
2. They are arranged in rings and possess cambium between xylem and phloem
3. They are confined to the cortex and lack secondary growth capability
4. They form a continuous cylinder and possess interfascicular cambium
1. They are randomly distributed and lack cambium between xylem and phloem
2. They are arranged in rings and possess cambium between xylem and phloem
3. They are confined to the cortex and lack secondary growth capability
4. They form a continuous cylinder and possess interfascicular cambium
Subtopic: Monocot Stem |
77%
Level 2: 60%+
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Collenchyma tissue provides mechanical support to growing organs primarily due to:
1. Presence of lignin deposition in primary and secondary walls of cells
2. Thickening of corners with cellulose and pectin in living cells
3. Development of thick secondary walls with suberin deposition
4. Formation of extensive intercellular spaces filled with air
1. Presence of lignin deposition in primary and secondary walls of cells
2. Thickening of corners with cellulose and pectin in living cells
3. Development of thick secondary walls with suberin deposition
4. Formation of extensive intercellular spaces filled with air
Subtopic: Simple Tissue: Chollenchyma & Sclerenchyma |
75%
Level 2: 60%+
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Meristematic tissues are characterised by:
| 1. | Dense cytoplasm and large vacuoles |
| 2. | Dense cytoplasm and prominent nuclei |
| 3. | Thin cytoplasm and small nuclei |
| 4. | Thin cytoplasm and large vacuoles |
Subtopic: Meristematic Tissues |
78%
Level 2: 60%+
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