Q. No.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
| 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 |
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1. Phellem
2. Phellogen
3. Phelloderm
4. Periderm
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1. Cork
2. Secondary phloem
3. Secondary cortex
4. Vascular cambium
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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
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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 |
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1. adjacent to the pith
2. just inside the vascular cambium
3. just outside the vascular cambium
4. immediately adjacent to the primary phloem
| 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 |
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| 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 |
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| 1. pericycle | 2. medullary rays |
| 3. endodermis | 4. hypodermis |
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