Question

agree or disagree with the following statement and justify your answer with evidence. passive transport requires energy because ions are moved against the concentration gradient.

Explanation:

Passive transport does not require energy. It is the movement of substances (including ions in some cases like facilitated diffusion) down their concentration gradient. Active transport is what requires energy as it moves substances against the concentration gradient. For example, simple diffusion (a type of passive transport) of oxygen across the cell membrane occurs from an area of higher oxygen concentration to lower without energy input. Facilitated diffusion (also passive) uses transport proteins but still moves substances down the gradient (e.g., glucose entering cells via glucose transporters when there's a higher glucose concentration outside the cell initially).

Answer:

Disagree. Passive transport moves substances down the concentration gradient and does not require energy. Active transport is what requires energy for movement against the concentration gradient.