This detailed and engaging lesson describes the movement of water molecules by osmosis and this is explained in terms of water potential. Both the PowerPoint and accompanying resources have been designed to cover the third part of specification point 2.3 as detailed in the AQA A-level Biology specification and they also describe the impact of solutions of different water potentials on suspended animal and plant cells.
It’s likely that students will have used the term concentration in their osmosis definitions at GCSE, so the aim of the starter task is to introduce water potential to allow students to begin to recognise osmosis as the movement of water molecules from a high water potential to a lower potential, with the water potential gradient. Time is taken to describe the finer details of water potential to enable students to understand that 0 is the highest value (pure water) and that this becomes negative once solutes are dissolved. Exam-style questions are used throughout the lesson to check on current understanding as well as prior knowledge checks which make links to previously covered topics such as the lipid bilayer of the cell membrane. The remainder of the lesson focuses on the movement of water when animal and plant cells are suspended in hypotonic, hypertonic or isotonic solutions and the final appearance of these cells is described, including any issues this may cause.
This lesson has been specifically written to tie in with the previous two lessons in topic 2.3 that cover the cell membrane and diffusion as well as an upcoming lesson on active transport and co-transport.
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Topic 2: Cells (AQA A-level Biology)
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Topic 2.3: Transport across cell membranes (AQA A-level Biology)
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Good progression through lesson with easy to understand tasks. Thank you
Another great resource for online teaching . Thank you.
Some useful explanations, thank you for sharing.
Thank you, very detailed and engaging
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