. Elementary botany. Botany. RESPJRA TION. "3 227. Respiration is necessary for growth.—After performing experiment in paragraph 221, it the vessel has not been open too long so that oxygen has entered, we may use the vessel for another , or set up a new one to be used in the course of r2 to 24 hours, after some oxvgen has been consumed. Place some folded damp filter paper on the germinating peas in the jar. Upon tliis place one-half dozen peas which have just been germinated, and in which the roots are about 20-25 """ 'ong- The vessel should be covered tightly a
. Elementary botany. Botany. RESPJRA TION. "3 227. Respiration is necessary for growth.—After performing experiment in paragraph 221, it the vessel has not been open too long so that oxygen has entered, we may use the vessel for another , or set up a new one to be used in the course of r2 to 24 hours, after some oxvgen has been consumed. Place some folded damp filter paper on the germinating peas in the jar. Upon tliis place one-half dozen peas which have just been germinated, and in which the roots are about 20-25 """ 'ong- The vessel should be covered tightly again and set aside in a warm Fig. 104. Pea seedlings; the one at the left had nu oxygen and little growth took place, the one at the right A second jar with water in the bottom instead in oxygen and growth - , . 1111 . was eWdent. of the germinatmg peas should be set up as a check. Damp folded filter paper should be supported above the water, and on this should be placed one- half dozen peas with roots of the same length as those in the jar containing carbon dioxide. 228. In 24 hours examine and note how much growth has taken place. It wdU be seen that the roots have elongated but very little or none in the first jar, while in the second one we see that the roots have elongated consider- ably, if the has been carried on carefully. Therefore in an atmosphere devoid of oxygen very little growth will take place, which shows that normal respira- tion with access of oxygen (aerobic respiration) is necessary for growth. 229. Another way of perform- ing the experiment.—If we wish we may use the following experi- ment instead of the simple one indicated above. Soak a handful of peas in water for 12-24 hours, and germinate so that twelve with the radicles 20-25 '""^ ^o^^g ^^J. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may no
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