Why do plants not have respiratory organs?

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(A) $(1)$ Each plant part takes care of its own gas-exchange needs.$(2)$ There is very little transport of gases from one plant part to another.$(3)$

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Plants have low metabolic rates.

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(A) $(1)$ Each plant part takes care of its own gas-exchange needs.$(2)$ There is very little transport of gases from one plant part to another.$(3)$ Plants do not present great demands for gas exchange.$(4)$ Roots,stems,and leaves respire at rates far lower than animals do.$(5)$ Only during photosynthesis are large volumes of gases exchanged,and each leaf is well adapted to take care of its own needs during these periods. When cells photosynthesize,the availability of $O_{2}$ is not a problem in these cells since $O_{2}$ is released within the cells.$(6)$ The distance that gases must diffuse,even in large,bulky plants,is not great.

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