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Q.
The given experimental set-up demonstrates
Respiration in Plants
Solution:
In the test tube full of mercury (figure $A$) there is no air and, therefore, the introduced soaked seeds do not get air for their respiration. But they are capable of respiration in the absence of oxygen as is indicated by the evolution of carbon dioxide (figure $B$). Therefore, anaerobic respiration takes place in the seeds in the absence of free oxygen. The experiment also shows that $CO_2$ is evolved in anaerobic respiration of seeds.
