. Beginners' Zoology . Fig. 4. — Breathing into a bottle. Fig. 5. — Testing the air in the bottle. Oxidation and Deoxidation. —The union of oxygen withcarbon and other substances, which occurs in fires andin the bodies of animals, is called oxidatioji. The separa-tion of the oxygen from carbon such as occurs in theleaves of plants is called deoxidation. The first processcets energy free, the other piocess stores it 7ip. Animalsgive off carbon dioxide from their lungs or gills, and plantsgive off oxygen from their leaves. But plants need someenergy in growing, so oxidation also occurs in plants
. Beginners' Zoology . Fig. 4. — Breathing into a bottle. Fig. 5. — Testing the air in the bottle. Oxidation and Deoxidation. —The union of oxygen withcarbon and other substances, which occurs in fires andin the bodies of animals, is called oxidatioji. The separa-tion of the oxygen from carbon such as occurs in theleaves of plants is called deoxidation. The first processcets energy free, the other piocess stores it 7ip. Animalsgive off carbon dioxide from their lungs or gills, and plantsgive off oxygen from their leaves. But plants need someenergy in growing, so oxidation also occurs in plants, butto a far less extent than in animals. At night, becauseof the absence of sunlight, no deoxidation is taking place 6 BEGINNERS ZOOLOGY in the plant, but oxidation and growth continue; so atnight the plant actually breathes out some carbon deepest part of the lungs contains the most carbondioxide. Why was it necessary to empty the lungs asnearly as possible in the experiment with the candle ? Whywo
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