E-PolyLearning

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

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

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

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

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