What is the effect of rubbing on a leaf?

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(A) The mechanical stimulation caused by bending or rubbing the leaf blade is sufficient to induce a significant increase in the rate of respiration,t

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Increased respiration

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(A) The mechanical stimulation caused by bending or rubbing the leaf blade is sufficient to induce a significant increase in the rate of respiration,typically ranging from $20-183\%$. This elevated rate can persist for several days. If the mechanical treatment is repeated at regular intervals,the stimulus gradually loses its effectiveness in increasing the respiration rate.

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