IGCSE Biology Paper-1: Specimen Questions with Answers 135 - 135 of 208

In the given experiment sucrose solution is taken in funnel which is separated from water through semi-permeable membrane. Water will move into funnel till the equilibrium is reached.

Which processes is responsible for these changes?

Answer

a.

Explanation

• Common experiment for demonstrating osmosis is thistle funnel experiment.
• Thistle funnel experiment - In the experiment sucrose solution is taken in funnel which is separated from water through semi-permeable membrane. Water will move into funnel till the equilibrium is reached.
• Osmosis is a kind of diffusion that plays a role in the movement of water into & within plants. In plants, it is the diffusion of water from higher concentration to lower concentration across a semi – permeable or differentially – permeable membrane.
• The net direction and rate of osmosis depends on pressure and concentration gradient. A solution which can cause the osmotic entry of water into it is said to be osmotically active solution.