Q. No.The length of different internodes in a culm of sugarcane is variable because of
1. Size of leaf lamina at the node below each internode
2. Intercalary meristem
3. Shoot apical meristem
4. Position of axillary buds
1. Size of leaf lamina at the node below each internode
2. Intercalary meristem
3. Shoot apical meristem
4. Position of axillary buds
The annular and spirally thickened conducting elements generally develop in the protoxylem when the root or stem is
| 1. differentiating | 2. maturing |
| 3. elongating | 4. widening |
Anatomically, fairly old dicotyledonous root is distinguished from the dicotyledonous stem by
1. Position of protoxylem
2. Absence of secondary xylem
3. Absence of secondary phloem
4. Presence of cortex
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Heart wood differs from sapwood in
1. Absence of vessels and parenchyma
2. Having dead and non-conducting elements
3. Being susceptible to pests and pathogens
4. Presence of rays and fibres
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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
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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
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