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photosynthesis

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by

Nurul Sheefa

on 28 July 2013

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Transcript of photosynthesis

PHOTOSYNTHESIS
What are we going to learn today
_ What gas is given off during photosynthesis (how to test for it)

- How does the different
light intensities
,
temperature
,
carbon dioxide concentrations
affect the rate of photosynthesis

- The relationship between the amount of variables and the rate of photosynthesis
Investigation 7.6
Investigation 7.5
Investgation 7.7
Effect of
different temperature
on the rate of photosynthesis
chlorophyll is required for photosynthesis.
Investigation 7.7
1. Set up the experiment shown below.(same as first step of INVESTIGATION 7.6)
Investigation 7.7
2. Keep a lamp
10cm away from the experiment
throughout the investigation.

3. Fill ice-cold water in the water bath and keep the temperature at 5 degree celsius. Allow the plant
to adapt to the condition
.

4. Count the number of bubbles over a period of 5 minutes. Repeat this to get the average.

5. Repeat step 4 at temperatures of 15 , 25 , 35, 45 ,55, 65, 75 degree celsius.

6. Record your results in a table and polt a graph to show the rate of bubbling per minute against the temperature.

Investigation 7.7
Questions for you to think about

- What is the effect of increasing temperature from 5 to 35 degree celcius?

- Which temperature do you think the bubbling occurs the fastest?

-What happen when the temperature is increased beyond the optimum temperature.
Investigation 7.5
to find out what gas is given off during photosynthesis
1. 2- 10g of sodium hydrogencarbonate is placed in the beaker to provide carbon dioxide for the plant.

2. Place the apparatus under strong light for a few hours.
- This is to allow the plant to get sufficient light energy needed for the experiment.

3. Bubbles will form on the leaves before rising to the top of the test tube.

-Why do you think the bubbles are formed on the leaves?

4. When the test tube is half-filled with gas, remove the tube by placing a thumb
over its mouth.
- They test tube must be properly secured so that the gas will not escape from the test tube.

5. Test the gas with a glowing splinter. If oxygen is present, the splinter will relight itself.
This experiment assumes that the rate of oxygen produced is directly proportional to the rate of photosynthesis.
Investigation 7.8
to investigate the effect of
different carbon dioxide concentrations
on the rate of photosynthesis
THANK YOU FOR YOUR KIND ATTENTION
Equation:


Carbon dioxide + water

light energy
glucose + oxygen + water
Definition:
A process in which
light energy
absorbed by chlorophyll is transformed into
chemical energy
.

Water and carbon dioxide are the raw materials.
Oxygen is released during the process.
Investigation 7.6
How can we investigate the effect of
different light intensities on the rate of photosynthesis?
1. Set up the apparatus as shown in the figure with the cut end of the water plant
positioned upwards
.

2. Air bubbles are given off from the cut end of the plant. Allow some time for the plant to adapt to the conditions provided before taking the readings.

3. When the bubbles are produced at a regular rate, count the
number of bubbles
over a
period of 5 minutes
.

4. Repeat step 3 with the light source closer to the plant,
eg. 80cm, 40cm, 30cm, 20cm, 15cm and 10cm.
* Note that
the nearer the light source
is to the beaker, the
higher the light intensity
that the plant is exposed to.
The higher amount of carbon dioxide present in the water, the higher the rate of photosynthesis.
Investigation 7.8
What is the purpose of sodium hydrogencarbonate?
Why must the end of the plant be cutted?
Can the watts of the lamp be changed?
Note:
Conditions:
1. Set up the apparatus as shown in the figure with the cut end of the water plant
positioned upwards
.

2. Keep a lamp
10cm away from the experiment
throughout the investigation.
*Must be conducted at room temperature.

3. Use different concentrations of sodium hydrogencarbonate solutions.
* 0.01 mol dm-3 , 0.02 mol dm-3, 0.03 mol dm-3, 0.04 mol dm-3, 0.05 mol dm-3

4. When the bubbles are coming out at a regular rate, measure the rate of bubbling for each concentration of hydrogencarbonate solution.

6. Plot a graph to show the rate of bubbling against the concentration of the solution.
How do the concentrations of sodium hydrogencarbonate solutions affect the rate of photosynthesis?
Temperature
water
Done by:
Sheefa
Yao Dong
Kelly
Alicia
Raw materials:
Sunlight
Chlorophyll
Carbon Dioxide
The higher the light intensity, the faster the rate of photosynthesis.
The rate of photosynthesis is best at the optimum temperature.

The rate of photosynthesis decreases above the optimum temperature.
Full transcript