Experiment to show oxygen in aerobic respiration
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1. Experiment to demonstrate the utility of oxygen in respiration:
Requirements:
A conical flask, a bent tube, germinating seeds, caustic potash in a small container, a mercury dish.
Method:
Germinating seeds are taken in a conical flask in which a container of caustic potash is also put. The mouth of this conical flask is closed by a single-holed cork through which a glass tube bent twice at right angles in inserted. The far end of this tube is put in the mercury dish. Now this apparatus is left undisturbed for some time.
Observation:
The mercury in far end of bent glass tube rises to a height of 15 cm.
Explanation:
The germinating seeds undergo aerobic respiration as they use the oxygen available inside the conical flask. As whole of the oxygen is used up by the germinating seeds, the pressure inside the flask is decreased. Hence, consequently the mercury level rises in the far end of the bent glass tube.
This level reaches only a height of 15 cm in the glass tube. As this level is about one-fifth the air. As oxygen constitutes one fifth of total composition, it is reasonable to infer that the seeds have used this gas of the air in respiration.
hope it helps.....
Requirements:
A conical flask, a bent tube, germinating seeds, caustic potash in a small container, a mercury dish.
Method:
Germinating seeds are taken in a conical flask in which a container of caustic potash is also put. The mouth of this conical flask is closed by a single-holed cork through which a glass tube bent twice at right angles in inserted. The far end of this tube is put in the mercury dish. Now this apparatus is left undisturbed for some time.
Observation:
The mercury in far end of bent glass tube rises to a height of 15 cm.
Explanation:
The germinating seeds undergo aerobic respiration as they use the oxygen available inside the conical flask. As whole of the oxygen is used up by the germinating seeds, the pressure inside the flask is decreased. Hence, consequently the mercury level rises in the far end of the bent glass tube.
This level reaches only a height of 15 cm in the glass tube. As this level is about one-fifth the air. As oxygen constitutes one fifth of total composition, it is reasonable to infer that the seeds have used this gas of the air in respiration.
hope it helps.....
Answered by
2
it is due to the fact that co2 given out during respiration has been absorbed by caustic potash producing partial vacuum oxygen present in the flask has been nitrogen we know that nearly one fifth of the volume of air is oxygen.
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