(B) The concentration of $CO_2$ in the atmosphere is typically around $0.03\%$.An increase in the concentration of $CO_2$ from the normal level of $0.

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(B) The concentration of $CO_2$ in the atmosphere is typically around $0.03\%$.An increase in the concentration of $CO_2$ from the normal level of $0.03\%$ to $0.05\%$ triggers the closure of stomata.$CO_2$ acts as an antitranspirant because it reduces the rate of transpiration by inducing stomatal closure.