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Q. No.Collenchyma in plants:
I:
occurs in layers below the epidermis in most of the dicotyledonous plants.
II:
consists of cells that are much thickened at the corners due to deposition of cellulose, hemicellulose, and pectin.
III:
never contains chloroplasts.
IV:
provides mechanical support to the growing parts of the plant such as the young stem and petiole of a leaf.
1. Only I, II, and III are correct
2. Only I, II, and IV are correct
3. Only II, III, and IV are correct
4. Only I, III, and IV are correct
Subtopic: Simple Tissue: Chollenchyma & Sclerenchyma |
86%
From NCERT
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Primary xylem is of two types – protoxylem and metaxylem.
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: | In roots, the protoxylem lies towards the center (pith) and the metaxylem lies towards the periphery of the organ. This type of primary xylem is called endarch. |
| Statement II: | In stems, the protoxylem lies towards the periphery and the metaxylem lies towards the center. Such an arrangement of the primary xylem is called an exarch. |
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: Complex Tissue: Xylem |
76%
From NCERT
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| Statement I: | Phloem fibers (bast fibers) are made up of sclerenchymatous cells and are absent in the primary phloem but are found in the secondary phloem. |
| Statement II: | The phloem parenchyma stores food material and other substances like resins, latex, and mucilage and is absent in most of the monocotyledons. |
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: Complex Tissue: Phloem |
86%
From NCERT
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Guard cells:
1. are bean-shaped in grasses
2. have a thin inner and a thick outer wall
3. do not contain chloroplasts
4. regulate the opening and closing of stomata
1. are bean-shaped in grasses
2. have a thin inner and a thick outer wall
3. do not contain chloroplasts
4. regulate the opening and closing of stomata
Subtopic: Epidermal Tissue System |
90%
From NCERT
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In an isobilateral leaf:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | the stomata are present on both the surfaces of the epidermis |
| II: | the mesophyll is not differentiated into palisade and spongy parenchyma |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Monocot Leaf |
87%
From NCERT
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Which of the following is missing in sieve tube elements when they attain maturity?
| 1. | Nuclei | 2. | Cytoplasm |
| 3. | P-protein | 4. | Callose |
Subtopic: Complex Tissue: Phloem |
88%
From NCERT
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Initiation of lateral roots and vascular cambium during the secondary growth in dicot roots takes place in:
1. Epidermal cells
2. Cortex cells
3. Pericycle
4. Endodermis
1. Epidermal cells
2. Cortex cells
3. Pericycle
4. Endodermis
Subtopic: Anatomy of Root |
84%
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: | Fascicular vascular cambium, interfascicular cambium, and cork-cambium are examples of lateral meristems. |
| Statement II: | These are responsible for producing secondary tissues. |
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: Meristematic Tissue:Classification (OLD NCERT) |
88%
From NCERT
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Identify A, B, C and D in the given figure:
| A | B | C | D | |
| 1. | Bundle sheath cells | Palisade mesophyll | Spongy mesophyll | Abaxial epidermis |
| 2. | Bundle sheath cells | Palisade mesophyll | Spongy mesophyll | Adaxial epidermis |
| 3. | Spongy mesophyll | Bundle sheath cells | Palisade mesophyll | Abaxial epidermis |
| 4. | Palisade mesophyll | Spongy mesophyll | Bundle sheath cells | Adaxial epidermis |
Subtopic: Monocot Leaf |
80%
From NCERT
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Name the plant tissue shown in the given figure:
1. Parenchyma
2. Collenchyma
3. Fibres
4. Sclereids
1. Parenchyma
2. Collenchyma
3. Fibres
4. Sclereids
Subtopic: Simple Tissue: Chollenchyma & Sclerenchyma |
89%
From NCERT
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