<prompt> Which of the following require energy?Simple diffusionFacilitated diffusionPassive transportActive transport  <response>: Ans: d Active transport Ref:Ganong, 22nd ed, p. 32The transport mechanism which requires energy is active transport. The different types of transport mechanisms are given below.Types of transport Passive transportSimple diffusionFacilitated diffusion Active transportSimple diffusion - along the cone gradient.No carrier involved.No energy requiredFacilitated diffusion - along the cone gradientCarrier mediatedNo energy required, bi-directionalActive transport - against the cone gradientCarrier mediatedRequire energy, unidirectional 