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a
Each plant part takes care of its own gas-exchange needs.
b
When cells photosynthesise, availability of O2 is not a problem in these cells since O2 is released within the cell.
c
Entire plant body is made up of living photosynthetic cells.
d
Plants do not present great demands for gas exchange. Roots, stems and leaves respire at rates far lower than animals do.
answer is D.
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