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Estimation of osmolarity in tissues by bathing samples in hypotonic and hypertonic solutions

Experiments

Here are experiments our science specialists have selected to support the IB* topic.

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Diffusion

Experiment #2 from Investigating Biology through Inquiry

After completing the Preliminary Activity, you will first use reference sources to find out more about diffusion and diffusion through a membrane before you choose and investigate a researchable question dealing with diffusion rate. Some topics to consider in your reference search are:

  • diffusion
  • facilitated diffusion
  • concentration gradient
  • salts
  • ion channels
  • ions
  • dialysis
  • semipermeable membrane
  • active transport

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Investigating Osmosis

Experiment #3 from Investigating Biology through Inquiry

In the Preliminary Activity, you will use a Gas Pressure Sensor to measure the rate of pressure change as water moves into or out of the cell (dialysis tube filled with sucrose solution). The pressure generated is called osmotic pressure and is in response to the overall movement of molecules, both water and sucrose, inside the dialysis cell.

After completing the Preliminary Activity, you will first use reference sources to find out more about osmosis and osmotic pressure before you choose and investigate a researchable question dealing with osmosis and osmotic pressure. Some topics to consider in your reference search are:

  • osmosis
  • diffusion
  • active and passive transport
  • semipermeable membrane
  • monosaccharide/disaccaride
  • hypotonic/hypertonic

Educational Standard
International Baccalaureate (IB)
Subject
Biology
Section
Prescribed Practicals
Topic
1.4 Membrane Transport

* The IB Diploma Program is an official program of the International Baccalaureate Organization (IBO) which authorizes schools to offer it. The material available here has been developed independently of the IBO and is not endorsed by it.

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