Elementary botany . Fig. tube filledwith CO2 from action ofyeast in a sugar solution. RES PIRA 117 239. Importance of green plants in maintaining purity of air.—By respi-ration, especially of animals, the air tends to become foul by the increaseofC02. Green plants, , plants with chlorophyll, purify the air duringphotosynthesis by absorbing CQ2 and giving off oxygen. Animals absorbin respiration large quantities of oxygen and exhale large quantities of absorb a comparatively small amount of oxygen in respiration andgive off a comparatively small amount of
Elementary botany . Fig. tube filledwith CO2 from action ofyeast in a sugar solution. RES PIRA 117 239. Importance of green plants in maintaining purity of air.—By respi-ration, especially of animals, the air tends to become foul by the increaseofC02. Green plants, , plants with chlorophyll, purify the air duringphotosynthesis by absorbing CQ2 and giving off oxygen. Animals absorbin respiration large quantities of oxygen and exhale large quantities of absorb a comparatively small amount of oxygen in respiration andgive off a comparatively small amount of C02. But they absorb duringphotosynthesis large quantities of CO, and give off large quantities of this way a balance is maintained between the two processes, so that thepercentage ofC02in the air remains approximately the same, viz., aboutfour-tenths of one per cent, while there are approximately 21 parts oxygenand 79 parts nitrogen 239a. Comparison of respiration and photosynthesis. Carbon dioxide is t
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Keywords: ., bookauthoratk, bookcentury1900, bookdecade1900, booksubjectbotany
