Osmosis Flashcards – AQA GCSE Biology - Foundation (8461)

What is osmosis?

The diffusion of water through a partially permeable membrane.

In which direction is the net movement of water by osmosis between solutions of different concentrations?

From the more dilute solution to the more concentrated solution.

Why can water move into or out of a cell by osmosis?

The cell membrane is partially permeable.

How do you calculate the percentage change in plant tissue mass?

$\frac{\text{final mass} - \text{initial mass}}{\text{initial mass}} \times 100\%$

What do positive and negative percentage changes in plant tissue mass indicate?

A positive result indicates a percentage gain; a negative result indicates a percentage loss.

Why do percentage changes allow plant tissues with different starting masses to be compared?

Each change is expressed relative to the tissue’s initial mass.