YEAR 10 – Topic 9 – Gas Exchange

Question 1

What is diffusion?

Answer 1

Diffusion is the net movement of particles from an area of high concentration to low concentration, going down a concentration gradient.

Question 2

How are gases exchanged in plants for photosynthesis and respiration?

Answer 2

For gas exchange the guard cells open and close the stoma to allow CO2 in for photosynthesis, then some of the oxygen produced goes out, but most is used for aerobic respiration to release energy from glucose.