Q. No.The cross-section shown in the given diagram shows the structure of a:
1.
Monocot stem
2.
Monocot root
3.
Dicot root
4.
Dicot stem
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In which of the following pairs of parts of a flowering plant is epidermis absent?
| 1. | Root tip and shoot tip | 2. | Shoot bud and floral bud |
| 3. | Ovule and seed | 4. | Petiole and pedicel |
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In the primary stems and roots, the type of cells usually present in cortex, pith and medullary rays is:
| 1. Parenchyma | 2. Collenchyma |
| 3. Sclerenchyma | 4. Meristem |
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Regarding the guard cells:
1. walls away from the stomatal pores are thin and those towards the stomatal pores are thick
2. walls away from the stomatal pores are thick and those towards the stomatal pores are thin
3. chloroplasts are mostly absent
4. play no role in the regulation of opening and closing of stomata
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Plants having little or no secondary growth are
| 1. | Grasses | 2. | Cycads |
| 3. | Conifers | 4. | Deciduous angiosperms |
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The vascular cambium normally gives rise to
| 1. | Phelloderm | 2. | Primary phloem |
| 3. | Secondary xylem | 4. | Periderm |
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Cortex is the region found between
1. endodermis and vascular bundle
2. epidermis and stele
3. pericycle and endodermis
4. endodermis and pith
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Read the different components from (a) to (d) in the list given below and tell the correct order of the components with reference to their arrangement from outer side to inner side in a woody dicot stem
(a) Secondary cortex
(b) Wood
(c) Secondary phloem
(d) Phellem
The correct order is:
| 1. (a), (b), (d), (c) | 2. (d), (a), (c), (b) |
| 3. (d), (c), (a), (b) | 4. (c), (d), (b), (a) |
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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