2.37 describe experiments to investigate the evolution of carbon dioxide and heat from respiring seeds or other suitable living organisms

Collect the gas coming off from the seeds and bubble through lime water to see if it turns cloudy.

Experiment uses to find out if living seed release heat when they respire:

-        Set up 2 flasks and place them inside a beaker

-        Inside the flasks place moist cotton wool at the bottom

-        Put living sees in one flask and dead seeds in the other

-        Put cotton wool blocking the opening of the flask

-        Stick thermometer through the cotton wool and leave the experiment for a week

-        Record the temperature

Since the living seeds release heat when they respire, the flask with the living seeds will have a higher temperature. The flask with the dead seeds will have no change in temperature because they wont be respiring.

A respirometer is: a device which measures the rate of consumption of oxygen by a living organism

A respirometer can also measure how much carbon dioxide is produced or how much heat energy is released. These can be used to investigate the rate of respiration