Which of the following statements about diffusion is false?

Question

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Diffusion is powered by the potential energy of a concentration gradient. Though it does not require an input of energy (e.g. ATP needed for active transport), the potential energy of the gradient drives the process of diffusion.
Some molecules, such as carbon dioxide and oxygen, can move across the plasma membrane directly, but other molecules do not have that ability and need help to move across the membrane. In a process called facilitated diffusion, membrane proteins (channels or carriers) help to facilitate the movement of molecules across the plasma membrane.
Gas exchange for photosynthesis is an example of diffusion - carbon dioxide from air to leaf, oxygen from leaf to air.
Gas exchange at the alveoli is also an example of diffusion- oxygen from air to blood, carbon dioxide from blood to air.
You may use the diagram below as a visual reference for the process of diffusion.
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Which of the Following Statements About Diffusion Is False