Q. No.Gymnosperms are also called soft wood spermatophytes because they lack
1. Cambium
2. Phloem fibres
3. Thick-walled tracheids
4. Xylem fibres
1. Cambium
2. Phloem fibres
3. Thick-walled tracheids
4. Xylem fibres
As compared to a dicot root, a monocot root has
1. More abundant secondary xylem
2. Many xylem bundles
3. Inconspicuous annual rings
4. Relatively thicker periderm
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Age of a tree can be estimated by:
1. biomass
2. number of annual rings
3. diameter of its heartwood
4. its height and girth
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Interfascicular cambium develops from the cells of:
| 1. Xylem parenchyma | 2. Endodermis |
| 3. Pericycle | 4. Medullary rays |
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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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Tracheids differ from the tracheary elements in
1. Having casparian strips
2. Being imperforate
3. Lacking nucleus
4. Being lignified
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) |
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