As the observation is that its against the concentration gradient its a active transport.
Active transport involves the movement of chemicals from a low-concentration location to a high-concentration area in opposition to the concentration gradient. Being "active" means that this process uses energy (usually in the form of ATP). Passive transport is in opposition to it
There are two types of active transport mechanisms. In primary active transport, molecules are moved across a membrane against their gradient directly using a chemical energy source (such as ATP). On the other hand, secondary active transport (cotransport) does not directly require a chemical source of energy like ATP since it leverages an electrochemical gradient created by active transport as an energy source to move molecules against their gradient.
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