Q. No.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. Interfascicular cambium
2. Secondary medullary rays
3. Cork cambium
4. Intrafascicular cambium
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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. Tropical deciduous forest
2. Temperate deciduous forest
3. Tropical evergreen forest
4. Temperate evergreen forest
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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| 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. Bulliform cells
2. Hydathodes
3. Lenticels
4. Albuminous cells
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