Investigate factors affecting rate of transpiration in a leafy shoot.

Authors Avatar

Transpiration Investigation.

Aim: the purpose of this investigation is to measure and investigate factors affecting rate of transpiration in a leafy shoot.

Materials:

  1. 4 - test tubes
  2. Tin foil
  3. 4 leafy shoot
  4. Test tube rack
  5. Sticky labels.
  6. Top - pan balance

Method: Select a suitable leafy plant, cut off 4 shoots from it.

  1. Weigh the shoots and record their weights.
  2. Fill the 4 test tubes with the same volume of water.
  3. Mark the water level on the test tube.
  4. Place the test tubes in a test tube rack.
  5. Cover the openings of the test tubes with tin foil.
  6. Push the shoots through the tin foil coverings and leave them in the test tubes.

NB: be careful not to break the shoot or create too big a hole in the covering.

  1. Using sticky labels, label the test tubes: Controlled
  • Warm
  • Dry
  • Windy
  1. Place all the test tubes into the environments they’ve been labelled with for the same length of time.
  2. After the chosen length of time, measure and record the difference in the water levels for each test tube.
  3. Re-weigh the plant shoots and record the change in weight.
Join now!

Predictions: I would expect all the test tube to show a decrease in their water levels because I expect all the plant to transpire.  But I expect the difference in water levels in each test tube to differ.  Of all the test tubes I expect the one labelled warm to show the greatest decrease in water level followed by the one labelled dry, then the test tube labelled windy.  The test tube labelled controlled should show the least decrease in water level.

Scientific knowledge: The external factor, which has the greatest effect on transpiration, is temperature. ...

This is a preview of the whole essay