| 41. | The evaporation of water from leaves is called |
| a. | transpiration |
| b. | cohesion |
| c. | tension |
| d. | pressure flow |
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Answer: (a).transpiration
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| 42. | Normally CO2 and O2 enter a plant by |
| a. | osmosis |
| b. | active transport |
| c. | diffusion |
| d. | evaporation |
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Answer: (c).diffusion
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| 43. | The cohesion-tension theory of water movement helps to explain how water moves from soil into root? |
| a. | Through the phloem |
| b. | From leaf to root |
| c. | Through the xylem |
| d. | Into the guard cells |
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Answer: (c).Through the xylem
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| 44. | When guard cells swell |
| a. | stomata close |
| b. | stomata open |
| c. | photosynthesis stops |
| d. | evaporation stops |
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Answer: (b).stomata open
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| 45. | Water moves into roots of plants by |
| a. | osmosis |
| b. | active transport |
| c. | diffusion |
| d. | pressure flow mechanism |
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Answer: (a).osmosis
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