Control and purpose

it acts as a control, to compare and confirm that any change in the volume of water is solely due to the number of leaves of the plant

it acts as a control, to compare and confirm that any change in the volume of water is solely due to the plsnt

it acts as a control, to compare and confirm that any change in the volume of water left in the beakers is solely due to the number of leaves of the plant

it acts as a control, to compare and confirm that any change in the volume of water left in the beakers is solely due to plant absorbing water through their roots.

Set-up C acts as a control set-up to compare and confirm that any change in the amount of light is solely due to the materials.

Set-up C acts as a control set-up to compare and confirm that any change in the amount of light is solely due to the light passing through the materials.

Set-up C acts as a control set-up to compare and confirm that any change in the amount of light detected by the light sensor is solely due to the materials.

Set-up C acts as a control set-up to compare and confirm that any change in the amount of light detected by the light sensor is solely due to the light passing through the materials.

To ensure that the data-logger records the results accurately.

To ensure that light from the laser does not reach the light sensor.

To ensure that light from surroundings does not reach the light sensor.

To ensure that light from the laser is reflected into the light sensor accurately.

This prevents the amount of roots from affecting the number of leaves of the plant.

This prevents the number of leaves from affecting the amount of roots of the plant.

This prevents the amount of roots from affecting the volume of water absorbed by the plant.

This prevents the number of leaves from affecting the volume of water absorbed by the plant.