Movement and accumulation of ions across a membrane against their concentration gradient can be explained by
- AActive Transport
- BOsmosis
- CFacilitated Diffusion
- DPassive Transport
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| Column-$I$ | Column-$II$ |
| $(a)$ Passive transport | $(p)$ Movement from higher concentration to lower concentration, no energy required |
| $(b)$ Active transport | $(q)$ Movement along the concentration gradient, requiring carrier proteins |
| $(c)$ Facilitated diffusion | $(r)$ Movement against the concentration gradient, requiring energy |
| $(d)$ Osmosis | $(s)$ Diffusion of solvent molecules across a semi-permeable membrane |
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$R$: Passive transport does not require energy.
$R$: Passive transport does not require energy.
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