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Q. No.Given below are two statements:
Assertion (A):
Long distance flow of photosynthates in plants occurs through sieve tubes
Reason (R):
A mature sieve tube has peripheral layer of cytoplasm without any nucleus
1.
Both (A) and (R) are true and (R) is the correct explanation of (A).
2.
Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.
(A) is true but (R) is false.
4.
Both (A) and (R) are false.
Subtopic: Complex Tissue: Phloem |
60%
Level 2: 60%+
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Given below are two statements:
| Assertion (A): | Cork prevents the loss of water by evaporation |
| Reason (R): | Cork cells are dead cells |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Activity of Cork Cambium |
55%
Level 3: 35%-60%
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Axillary buds are present in the axils of leaves and are capable of forming a branch or a flower.
Which of the following statements is not true for them?
Which of the following statements is not true for them?
| 1. | They are formed by some cells present in the mature regions of shoots |
| 2. | They are involved in primary growth |
| 3. | Some cells 'left behind' from shoot apical meristem, constitute them |
| 4. | They contribute to formation of primary plant body |
62%
Level 2: 60%+
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Collenchyma is also a living simple tissue just like parenchyma. However, it differs from the latter as it
| 1. | Contains cells that may be oval, spherical or polygonal |
| 2. | Has small intercellular spaces |
| 3. | Has pectin rich wall and provide mechanical support to growing parts of plants |
| 4. | Can perform photosynthesis |
Subtopic: Simple Tissue: Parenchyma | Simple Tissue: Chollenchyma & Sclerenchyma |
79%
Level 2: 60%+
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Gymnosperms
The correct one is/are
1. a and b only
2. a and c only
3. d only
4. a, b and d only
| a. | Lack vessels |
| b. | have sieve tube elements |
| c. | Have elongated tube like highly lignified main water transporting tissue |
| d. | Lack lateral meristem |
The correct one is/are
1. a and b only
2. a and c only
3. d only
4. a, b and d only
Subtopic: Complex Tissue: Xylem |
71%
Level 2: 60%+
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A mature sieve tube element transports food in plants
Which of the following features is/are true for this element?
1. Only c
2. Only a and c
3. Only b and c
4. All a, b and c
Which of the following features is/are true for this element?
| a. | Presence of peripheral cytoplasm |
| b. | Possesses a large vacuole |
| c. | Lacks nucleus |
1. Only c
2. Only a and c
3. Only b and c
4. All a, b and c
Subtopic: Complex Tissue: Phloem |
86%
Level 1: 80%+
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The companion cells are specialised parenchymatous cells which are closely associated with the sieve tubes elements. The sieve tube elements and companion cells are connected through
| 1. | Perforations in their common walls |
| 2. | Perforations in their end walls |
| 3. | Pit fields between their common longitudinal walls |
| 4. | Bordered pits in their oblique end plates |
Subtopic: Complex Tissue: Phloem |
71%
Level 2: 60%+
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Identify the anatomical structure found in flowering plants on the basis of following features and select the correct option regarding this
1. Produces secondary tissues
2. Gradually obliterated due to secondary growth
3. Performs photosynthesis
4. Conducts water and minerals only
| (i) | First formed primary complex tissue |
| (ii) | Has living elements |
| (iii) | Narrow sieve tubes |
1. Produces secondary tissues
2. Gradually obliterated due to secondary growth
3. Performs photosynthesis
4. Conducts water and minerals only
Subtopic: Complex Tissue: Phloem |
Level 3: 35%-60%
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Dicot leaves are different from monocot leaves as in the former
| 1. | Guard cells are dumb-cell shaped |
| 2. | More stomata are present at abaxial surface as compared to adaxial surface |
| 3. | Trichomes are usually unicellular |
| 4. | Guard cells possess chloroplasts |
Subtopic: Dicot Leaf | Monocot Leaf |
77%
Level 2: 60%+
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Vascular bundles in wheat stems are
| 1. | Scattered and open |
| 2. | Conjoint and open |
| 3. | Radial and closed |
| 4. | Conjoint and closed |
Subtopic: Vascular Tissue System |
71%
Level 2: 60%+
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