experiment to show the process of transpiration
Answers
Answer:
Simple experiments can be conducted to demonstrate these factors. Transpiration is a process that involves loss of water vapour through the stomata of plants. Transpiration is thought to be a 'necessary cost or evil' to allow the plant to absorb water from the soil. It is an inevitable process.
As the leafy twig transpires, the air bubble moves to towards the plant. The quicker the air bubble moves, the faster the leafy twig is transpiring.
potometer measures the rate of transpiration.
Determining the effect of environmental conditions on transpiration rate using a potometer
aim:
To determine the effect of environmental conditions on transpiration rate using a simple potometer.
Apparatus:
drinking straw or clear plastic tubing
soft green leafy shoot
Vaseline
marking pen
play dough / putti/ Prestick
plastic bag
elastic band
ruler
method:
A potometer measures the rate of transpiration by measuring the movement of water into a plant. The following experiment uses a simple hand made potometer.
Learners will be divided into four groups as each group will investigate a different factor and then all the results can be shared at the end of the investigation.
Perform the following steps under water:
1.Cut the stem of the leafy shoot (at an angle to increase the surface area) under water . The reason we cut it under water is to prevent air bubbles entering the xylem vessel. You must use a very sharp knife or new scalpel and cut at an angle in order to increase surface area for water uptake in the xylem. Florists who cut plants before immersing them in water follow the same procedure for this reason.
Test to make sure the stem of the leafy twig will fit snugly into the top of the straw.
2.Remove the leafy shoot from the straw and set aside, keeping the stem submerged, and the leaves above water.
3.Fill the straw with water. Place your finger over one end of the straw to stop the water from running out.
4.Put the leafy shoot into the open end and seal it with play dough/ putti/ Prestick while removing it from water KEEPING YOUR FINGER ON THE STRAW! Perform the following steps above water.
5.Seal with Vaseline. Make sure it is air tight and water tight. If not, all the water will run out when you take your finger off the straw.
6.Mark the water level on the straw.
Place your potometer under one of the following conditions for one hour:
as is, in a warm, sunny place (no wind)
as is, in a warm, windy place
with a plastic bag tied around the leaf, in a warm, sunny place
a shady place.
7.Every 10 minutes use a marking pen to mark the change in water level on the straw. Continue taking measurements for 1 hour.
8.Measure the distance the water moves during each time interval.
Results
9.Each of the four groups that investigated different environmental conditions should contribute their results for the final analysis.
10.Draw a table and record the class' results.
11.Plot a bar graph to compare the total distances the water moved in the different straws in 1 hour under the four different environmental conditions.
12.At the end of the experiments, all students must plot the following line graphs:
(1)the effect of temperature on the rate of transpiration
(2)the effect of light intensity on the rate of transpiration
(3)the effect of relative humidity on the rate of transpiration
(4)the effect of wind on the rate of transpiration
observation:
Record your observation from the table, bar graph and line graphs.
conclusion:
What can you conclude from this investigation?
Give two ways in which you can improve your experimental results.
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