Lenticels are involved in:
1. Gaseous exchange | 2. Food transfer |
3. Photosynthesis | 4. Transpiration |
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The cork cambium, cork and secondary cortex are collectively called
1. phellogen | 2. periderm |
3. phellem | 4. phelloderm |
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Vascular bundles in monocotyledons are considered closed because
1. | Cambium is absent |
2. | There are no vessels with perforations |
3. | Xylem is surrounded all around by phloem |
4. | A bundle sheath surrounds each bundle |
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Which of the following statements about cork cambium is incorrect?
1. | It forms a secondary cortex on its outside |
2. | It forms a part of periderm |
3. | It is responsible for the formation of lenticels |
4. | It is a couple of layers thick |
Match List-I with List-II.
List -I | List -I I | ||
(a) | Lenticels | (i) | Phellogen |
(b) | Cork cambium | (ii) | Suberin deposition |
(c) | Secondary cortex | (iii) | Exchange of gases |
(d) | Cork | (iv) | Phelloderm |
Choose the correct answer from the options given below.
(a) | (b) | (c) | (d) | |
1. | (ii) | (iii) | (iv) | (i) |
2. | (iv) | (ii) | (i) | (iii) |
3. | (iv) | (i) | (iii) | (ii) |
4. | (iii) | (i) | (iv) | (ii) |
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Which of the following is made up of dead cells?
1. Xylem parenchyma
2. Collenchyma
3. Phellem
4. Phloem