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Q. No.Which of the following terms includes all others?
1. Phellem
2. Phellogen
3. Phelloderm
4. Periderm
Subtopic: Activity of Cork Cambium |
82%
From NCERT
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The non-technical term Bark in an old woody stem does not include:
| 1. | Cork | 2. | Secondary phloem |
| 3. | Secondary cortex | 4. | Vascular cambium |
Subtopic: Activity of Cork Cambium |
69%
From NCERT
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Phellogen cuts cells on both sides where:
| 1. | outer cells differentiate into cork or phelloderm and inner cells differentiate into secondary cortex or phellem |
| 2. | inner cells differentiate into cork or phelloderm and outer cells differentiate into secondary cortex or phellem |
| 3. | outer cells differentiate into cork or phellem and inner cells differentiate into secondary cortex or phelloderm |
| 4. | inner cells differentiate into cork or phellem and outer cells differentiate into secondary cortex or phelloderm |
Subtopic: Activity of Cork Cambium |
71%
From NCERT
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During secondary growth, the meristem that arises within the cortex is called as:
| 1. pith meristem | 2. cork cambium |
| 3. cortex cambium | 4. vascular cambium |
Subtopic: Activity of Cork Cambium |
80%
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What is not true for heartwood?
1. Deposition of organic compounds leading to dark brown color
2. Present in innermost or central layers of the stem
3. Dead elements with lignified walls
4. Conducts water and minerals
1. Deposition of organic compounds leading to dark brown color
2. Present in innermost or central layers of the stem
3. Dead elements with lignified walls
4. Conducts water and minerals
85%
From NCERT
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Match each item in Column I with one in Column II and select the correct answer from the codes given:
| A. Spring [early] wood | a. Xylary elements with wider cavities |
| B. Autumn [late] wood | b. Xylary elements with narrow vessels |
| C. Heartwood | c. Central or innermost layers of secondary xylem |
| D. Sapwood | d. Peripheral region of the secondary xylem |
| A | B | C | D | |
| 1. | a | b | c | d |
| 2. | a | b | d | c |
| 3. | b | a | c | d |
| 4. | b | a | d | c |
74%
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In a four-year-old stem, where would you expect to find the oldest secondary xylem?
1. adjacent to the pith
2. just inside the vascular cambium
3. just outside the vascular cambium
4. immediately adjacent to the primary phloem
1. adjacent to the pith
2. just inside the vascular cambium
3. just outside the vascular cambium
4. immediately adjacent to the primary phloem
51%
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Consider the given two statements:
| I. | In secondary growth in dicot stems, the amount of secondary phloem produced is more than secondary xylem |
| II. | The cambium is generally more active on the outer side than the inner |
| 1. | Both I and II are true and II explains I |
| 2. | Both I and II are true but II does not explain I |
| 3. | I is true but II is false |
| 4. | Both I and II are false |
73%
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The cambial ring in the dicot stem cuts:
| 1. | cells that mature into secondary xylem towards pith and into secondary phloem towards periphery |
| 2. | cells that mature into secondary xylem towards periphery and into secondary phloem towards pith |
| 3. | cells that mature into primary xylem towards pith and into primary phloem towards periphery |
| 4. | cells that mature into primary xylem towards periphery and into primary phloem towards pith |
Subtopic: Activity of Cork Cambium |
72%
From NCERT
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Interfascicular cambium in dicot stems is formed from the cells of:
| 1. pericycle | 2. medullary rays |
| 3. endodermis | 4. hypodermis |
76%
From NCERT
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