Q. No.Some vascular bundles are described as open because these
1. are surrounded by pericycle but no endodermis
2. are capable of producing secondary xylem and phloem
3. possess conjunctive tissue between xylem and phloem
4. are not surrounded by pericycle
1. are surrounded by pericycle but no endodermis
2. are capable of producing secondary xylem and phloem
3. possess conjunctive tissue between xylem and phloem
4. are not surrounded by pericycle
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Water containing cavities in vascular bundles are found in
| 1. Sunflower | 2. Maize |
| 3. Cycas | 4. Pinus |
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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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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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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Which of the following is made up of dead cells?
1. Xylem parenchyma
2. Collenchyma
3. Phellem
4. Phloem
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