The two situations in which a cell would need to use active transport instead of diffusion are :
- Calcium uses energy from ATP to move between cells.
- Transportation of chloride and nitrate from the cytosol to the vacuole.
What do you mean by Active Transport?
Active transport may be defined as the migration of a chemical substance by the expense of energy against a gradient in concentration or in electrical potential across a plasma membrane.
The process of transportation happens in plants, while calcium movement takes place in both plants as well as animal cells for the proper functioning of the whole body.
Therefore, above are two situations in which a cell would need to use active transport instead of diffusion.
To learn more about Diffusion, refer to the link:
https://brainly.com/question/94094
