Keep in mind active transport is always against the concentration gradient.
For active transport pumps or chaanel protiens needed so if these are pasaing through phospholipids than most probably it is passive transport.
Listen dear it is it is more important that movement is along or against the concentration gradient than what is moving if it is along concentration gradient than it is passive and if against gardient it is active
Simple to remember is energy ATP is used active other wise passive .
