How Surface Area Affects the Rate of Transpiration of Leaves
To show that transpiration did occur on a leaf we did a preliminary
experiment. We took two plants, and set them in a bell jar, one of the
plants was cut beneath its leaves, so that we could show that if it
did transpire it would be from the leaves and not the stem. The
experiment was set up like this:
Water appeared on the side of the bell jar, this shows that
transpiration does occur through the leaves of a plant.
For the method we are going to use to see if surface area affects the
size of a leaf we are going make sure that we keep the leaves in the
same conditions at all time, because light, wind or temperature might
affect it. So we are keeping the leaves away from the window and we
also will shut the windows, but we can't do much about that so we will
presume that the temperature will be kept constant. I think that our
results will show that surface area will not make any difference to
the amount perspired, even if a bigger leaf might have more
chlorophyll. I think that this will happen because I think that the
even if one leaf perspires faster in the end they would have perspired
the same amount.
I took 3 leaves of different shapes and took down their mass; we took
their mass on a weighing scale of two decimal points as it is more
accurate. We then hanged them up on a threat with a peg. The thread
was hold up by two stands and we let them be for 20 minutes. After 20
minutes we took the 3 leaves down and took down their mass again. We
did this 3 times, so we have 3 readings. All the way through we made
sure that the leaves were held at a distance so that if they did
touched it might have affected our readings. We only could do 3
readings as we only had a double lesson to do this experiment and if
then cut up 5 pieces of potato and weigh them to make sure they all
The Effect of Light Intensity on the Rate of Oxygen Production in a Plant While Photosynthesis is Taking Place
In my experiment, I will use an overall volume of 50 cm³ of 2moles of
I am going to carry out an experiment to measure the change in mass of
The cause of this change in mass is called osmosis. Osmosis is the movement of water. through cells in plants. I make my prediction on the pretext that water diffuses from high concentration cells to low concentration. cells.
I prepared two large test tubes, each should have an inch of KOH pellets on the bottom of the tube. Next, a cotton ball is placed in each of the two test tubes above the KOH to plug the tube. Now one tube is filled to the top with peas, the peas are then removed and weighed to the nearest.1 grams, this is the experimental tube. The control tube is filled with plastic balls to the same height as the experimental tube. Next, a rubber stopper with attached capillary tubing is inserted in each test tube.
We used wheatgrass were 40 wheatgrass seeds, two empty pots, soil, and water. We first added soil for both pots and 20 wheatgrass seeds in each pot. My partner and I decided that we label pot one experiment which is “sugar and water” and pot two control which is “water” only. The experiment was for almost four weeks we had to make sure both get the same room temperature and water, so we can see the results after this amount of time. Both pots had same room temperature so both can have the same amount of sunlight also, the same amount of water which is a glass of water from the sink once a week. In the experiment pot we added a glass of water with one teaspoon of sugar and the control pot glass of water. Every week we used to see both pots grow almost the same. At the end of the experiment, my partner and I measured the length for both plants and we recorded the average for each plant, so we can know the rate of growth
We will do this about 4 times and see the difference and see if there is any change.
Prepare casts of the leaves surfaces by painting the adaxial (top surface) of one leaf and the abaxial (bottom surface) of the other leaf with clear nail polish. Allow the nail polish to dry for approximately 10 minutes. While the nail polish is drying, label microscope slides as either adaxial (top of the leaf) or abaxial (bottom of the leaf). Cut a piece of sellotape approximately 1.5 cm in length. Fold the tape over on itself leaving 0.5 cm of sticky surface exposed.
The Reasoning behind the experiment is to see what effects Temperature has on the permeability of Phospholipid bi-layer of Beetroot cells and the amount of pigment released from the vacuole.
Investigating the Effect of Light Intensity on Photosynthesis in a Pondweed Aim: To investigate how the rate of photosynthesis changes at different light intensities, with a pondweed. Prediction: I predict that the oxygen bubbles will decrease when the lamp is further away from the measuring cylinder, because light intensity is a factor of photosynthesis. The plant may stop photosynthesising when the pondweed is at the furthest distance from the lamp (8cm). Without light, the plant will stop the photosynthesising process, because, light is a limited factor. However once a particular light intensity is reached the rate of photosynthesis stays constant, even if the light intensity is the greatest.
We then put the stopwatch on and left them for half an hour. After we weighed each potato tube and recorded our results. We did the experiment twice. We did this to make sure our results were correct. Preliminary method: We did everything the same as in our other experiment except we
- Suface Area: if you are to change the surface area it is going to
* Surface Area - This will not affect any of my results, as we are