Q. No.You are given a fairly old piece of dicot stem and a dicot root. Which of the following anatomical structures will you use to distinguish between the two?
1. Secondary xylem
2. Secondary phloem
3. Protoxylem
4. Cortical cells
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A major characteristic of the monocot root is the presence of
1. Scattered vascular bundles
2. Vasculature without cambium
3. Cambium sandwiched between phloem and xylem along the radius
4. Open vascular bundles
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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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) |
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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The vascular cambium normally gives rise to
| 1. | Phelloderm | 2. | Primary phloem |
| 3. | Secondary xylem | 4. | Periderm |
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Plants having little or no secondary growth are
| 1. | Grasses | 2. | Cycads |
| 3. | Conifers | 4. | Deciduous angiosperms |
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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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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