Answers

2015-06-13T09:12:09+05:30
 When molecule travels from a higher concentration to a lower concentration through a concentration gradient.It is known as passive transport. eg -- diffusion
and osmosis.
Active transport refers to when molecule travels from a region of lower concentration to a region of higher concentration against the concentration . gradient. eg - Na/K pump .
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2015-06-13T12:30:16+05:30
  Passive - from a region of high concentration to a region of low concentration down its concentration gradient. 

Active - from a region of low concentration to a region of high concentration up its concentration gradien
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