2012 Biology HSC QUESTION- HELP (1 Viewer)

ellie95

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Hi Guys,

The 2012 Paper, question 10,

http://www.boardofstudies.nsw.edu.au/hsc_exams/hsc2012exams/pdf_doc/2012-hsc-exam-biology.pdf

What type of process is modelled in the diagram?
(A) Osmosis
(B) Filtration
(C) Diffusion
(D) Active transport

I thought it was A, but the answer says active transport. I don't understand how it is active transport. Active transport requires an expenditure of energy as well as does not travel against a concentration gradient. Shouldn't it be osmosis?
 

Menomaths

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Osmosis is for when water moves across the concentration gradient to where there is a higher concentration of ions. Active transport is the movement of ions from a lower concentration to a higher concentration, which requires energy expenditure.
 

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