active transport moves a substance from a more dilute concentration to a more concentrated solution therefore against the concentration gradient
active transport in the small intestine:
e.g sugars use activetransport to move from the lumen of the small intestine inside the cell - these cells have lots of mitochondria which use respiration to provide energy
active transport in plant:
ions in the soil move into the roothair cell these have lots of mitochondria to provide energy
plant cells use active transport to absorb mineral ions