active transport

• Active transport is the movement of molecules across a membrane, from a region of low concentration to a region of higher concentration. This requires energy from respiration.
• Is active transport a passive or active process?

  active because it requires energy
• True or false? Active transport can only take place across a membrane.

  true
• Which process provides the energy required for active transport?

  Respiration
• Why can't plants absorb mineral ions by diffusion?

  Their concentration is higher in the cell than in the soil
• Which cells in the plant are adapted to absorb mineral ions?

  root hair cells
• Other than mineral ions, which other molecule do root hair cells absorb? 

  water