The image shows a Visking tubing containing a suspension of banana paste, immersed in iodine solution. a) Name the physiological process being investigated. b) State the expected colour of the solutions inside and outside the visking tubing after 30 minutes. c) Explain the observation made in 10(b) above. 11. The figure below represents an organism.

10.

a) Name the physiological process being investigated.
The physiological process being investigated is diffusion.

b) State the expected colour of the solutions inside and outside the Visking tubing after 30 minutes.
Inside: Blue-black
Outside: Yellow-brown (or reddish-brown)

c) Explain the observation made in 10(b) above.
The Visking tubing acts as a partially permeable membrane. Iodine molecules are small enough to diffuse from the region of higher concentration (outside) into the Visking tubing. Inside, the iodine reacts with the starch in the banana paste, turning the solution blue-black. Starch molecules are too large to diffuse out of the Visking tubing, so the iodine solution outside remains yellow-brown.