After the poster gallery ,
we now know ...
1) Some similarities as well as the differences of photosynthesis and respiration (aerobic , anaerobic)
2) What plants require to photosynthesize.
3) How does a plant photosynthesize.
4)How respiration occur.
However ,
we're still stuck at ..
1) What is ATP all about ?
2) what is happening / what is dark stage ?
3) and , what is happening / what is light stage ?
Sunday, August 29, 2010
Saturday, August 28, 2010
To answer some QUESTION by ms wang
Why we need to have anaerobiv respiration as lactic acid produced as a waste product; not nearly as much energy is released as with aerobic respiration. However it is necessary if, for example, you are running. In this case, it won't be long before the body's demand for oxygen overtakes supply. This is where anaerobic respiration replaces aerobic respiration.
Once you have finished exercising, your heart and breathing rates continue to rise, in order for you to repay your oxygen debt.
Once you have finished exercising, your heart and breathing rates continue to rise, in order for you to repay your oxygen debt.
To add on to our poster about Aerobic and Anaerobic respiration :
Aerobic respiration is the process that takes place in presence of oxygen. Aerobic respiration is the metabolic process that involves break down of fuel molecules to obtain bio-chemical energy and has oxygen as the terminal electron acceptor. Fuel molecules commonly used by cells in aerobic respiration are glucose, amino acids and fatty acids.
it can be represented like that : Glucose + Oxygen →Energy + Carbon dioxide + Water.
Secondly : aerobic respiration is a high energy yielding process. During the process of aerobic respiration as many as 38 molecules of ATP are produced for every molecule of glucose that is utilized. Thus aerobic respiration process breaks down a single glucose molecule to yield 38 units of the energy storing ATP molecules.
Anaerobic respiration : It takes place without oxygen , it is the process of oxidation of molecules in the absence of oxygen, which results in production of energy in the form of ATP or adenosine tri-phosphate.
it can be represented / occur in these two ways :
1)Glucose (Broken down to) →Energy (ATP) + Ethanol + Carbon dioxide (CO2)
2) Glucose (Broken down to) →Energy (ATP) + Lactic acid
the difference betwen these two types of repiration is also that in aerobic respiration , it is a high energy yielding process whereas in anaerobic respiration , it is relatively less energy yielding as compared to the aerobic respiration process.
Secondly , anaerobic respiration breaks down one glucose molecule to obtain two units of the energy storing ATP molecules. However , in anaerobic repiration , a single glucose molecule is broken down to yield 38 units of the energy storing ATP molecules.
Our own theory : both photosynthesis and respiration involves chemical process but not chemical processes.
However , some says that both processes are chemical processes.
which is true ?
another post will be put up later.
Aerobic respiration is the process that takes place in presence of oxygen. Aerobic respiration is the metabolic process that involves break down of fuel molecules to obtain bio-chemical energy and has oxygen as the terminal electron acceptor. Fuel molecules commonly used by cells in aerobic respiration are glucose, amino acids and fatty acids.
it can be represented like that : Glucose + Oxygen →Energy + Carbon dioxide + Water.
Secondly : aerobic respiration is a high energy yielding process. During the process of aerobic respiration as many as 38 molecules of ATP are produced for every molecule of glucose that is utilized. Thus aerobic respiration process breaks down a single glucose molecule to yield 38 units of the energy storing ATP molecules.
Anaerobic respiration : It takes place without oxygen , it is the process of oxidation of molecules in the absence of oxygen, which results in production of energy in the form of ATP or adenosine tri-phosphate.
it can be represented / occur in these two ways :
1)Glucose (Broken down to) →Energy (ATP) + Ethanol + Carbon dioxide (CO2)
2) Glucose (Broken down to) →Energy (ATP) + Lactic acid
the difference betwen these two types of repiration is also that in aerobic respiration , it is a high energy yielding process whereas in anaerobic respiration , it is relatively less energy yielding as compared to the aerobic respiration process.
Secondly , anaerobic respiration breaks down one glucose molecule to obtain two units of the energy storing ATP molecules. However , in anaerobic repiration , a single glucose molecule is broken down to yield 38 units of the energy storing ATP molecules.
Our own theory : both photosynthesis and respiration involves chemical process but not chemical processes.
However , some says that both processes are chemical processes.
which is true ?
another post will be put up later.
Sunday, August 22, 2010
Question of teh day
Question of the day !
A plant that receives the nutrition it needs will continue to live.But what if we took all its oxygen away ?Do you think the plant can still grow ?Why ?
Ans :
No !The plant would not grow ,It is true that a plant need to take in carbon dioxide in order to survive and that it expels oxygen as the waste product of photosynthesis.But a plant doesnt only stores the food it produces-it uses some to feed itself.When a plant feeds on its own food ,The food is broken down in the same way that its broken down in an animal's body ,including yours,with oxygen .The oxygen needed to break down the carbohydrate molecules and release the energy stored in those molecules.While a plant is photosynthesising its producing more than enough oxygen to break down its own food.But if you were to take away the oxygen surrounding the plant ,The plant would in effect die.
A plant that receives the nutrition it needs will continue to live.But what if we took all its oxygen away ?Do you think the plant can still grow ?Why ?
Ans :
No !The plant would not grow ,It is true that a plant need to take in carbon dioxide in order to survive and that it expels oxygen as the waste product of photosynthesis.But a plant doesnt only stores the food it produces-it uses some to feed itself.When a plant feeds on its own food ,The food is broken down in the same way that its broken down in an animal's body ,including yours,with oxygen .The oxygen needed to break down the carbohydrate molecules and release the energy stored in those molecules.While a plant is photosynthesising its producing more than enough oxygen to break down its own food.But if you were to take away the oxygen surrounding the plant ,The plant would in effect die.
Thursday, August 19, 2010
Aerobic respiration :
if people are wondering about the equation ,
here's a more direct equation : (minimum knowledge)
Some organisms can respire in the absence of air: this is anaerobic respiration. This does not release so much energy and it produces much more toxic waste products. However, if Oxygen is not available, anaerobic respiration is better than nothing. When this happens in our muscles we produce lactic acid which gives you cramp. The bacteria in milk produce the same chemical when they turn it sour. "Lactic" means "of milk". So lactic acid is the acid in sour milk. Yeasts produce alcohol which is also toxic. Eventually there will be so much alcohol that the yeast cannot survive.
for more information , http://www.purchon.com/biology/aerobic.htm .
please do visit it .
a molecule of glucose contains six atoms of Carbon (shown in blue), twelve atoms of Hydrogen (shown in green), and six atoms of Oxygen (shown in red).
do you agree with that ? ^
if people are wondering about the equation ,
here's a more direct equation : (minimum knowledge)
Glucose + Oxygen = Carbon Dioxide + Water + Energy
Some organisms can respire in the absence of air: this is anaerobic respiration. This does not release so much energy and it produces much more toxic waste products. However, if Oxygen is not available, anaerobic respiration is better than nothing. When this happens in our muscles we produce lactic acid which gives you cramp. The bacteria in milk produce the same chemical when they turn it sour. "Lactic" means "of milk". So lactic acid is the acid in sour milk. Yeasts produce alcohol which is also toxic. Eventually there will be so much alcohol that the yeast cannot survive.
for more information , http://www.purchon.com/biology/aerobic.htm .
please do visit it .
a molecule of glucose contains six atoms of Carbon (shown in blue), twelve atoms of Hydrogen (shown in green), and six atoms of Oxygen (shown in red).
do you agree with that ? ^
Wednesday, August 18, 2010
Tracing paper
Experiment:
Hypothesis: A tracing paper covering a plant would affect the rate of photosynthesis.
Aim: To test whether light intensity affects the rate of photosynthesis.
Approach: A tracing paper is been covered over a plant and it is tested whether it affects the rate of photosynthesis.
Apparatus :Data logger x3 ,Hydrilla x3 ,Beaker x3 ,Lamp x1 ,Oxygen Sensor x2
Materials: Tracing paper x1, Trashbag x1
Steps: 1) Tracing paper covered over hydrilla which is inside a beaker of water.
2) Put it under lamp for 20-30 minutes
3) Use oxygen sensor and connect it to data logger and test for the amount of oxygen.
4) Compare results with the other 2 beakers.
5) Form a conclusion and check hypothesis.
Experimental Error: - Didn’t give enough time for hydrilla to adapt to the sodium hydrogen carbonate.
-Oxygen sensor faulty.
Results: The amount of oxygen produced by the hydrilla in the beaker of water decreases for the first 20 seconds and it started increasing for around 10 seconds. Starting from 20+ seconds. After which, it started decreasing again.
Conclusion: Tracing paper covering a plant placed in a beaker of water affects the rate of photosynthesis. (Rate goes slower)
Table:
Time/s 0 10 20 30 40
Amount of Oxygen /g/L 3.725 3.16 3.05 3.15 2.90
Hypothesis: A tracing paper covering a plant would affect the rate of photosynthesis.
Aim: To test whether light intensity affects the rate of photosynthesis.
Approach: A tracing paper is been covered over a plant and it is tested whether it affects the rate of photosynthesis.
Apparatus :Data logger x3 ,Hydrilla x3 ,Beaker x3 ,Lamp x1 ,Oxygen Sensor x2
Materials: Tracing paper x1, Trashbag x1
Steps: 1) Tracing paper covered over hydrilla which is inside a beaker of water.
2) Put it under lamp for 20-30 minutes
3) Use oxygen sensor and connect it to data logger and test for the amount of oxygen.
4) Compare results with the other 2 beakers.
5) Form a conclusion and check hypothesis.
Experimental Error: - Didn’t give enough time for hydrilla to adapt to the sodium hydrogen carbonate.
-Oxygen sensor faulty.
Results: The amount of oxygen produced by the hydrilla in the beaker of water decreases for the first 20 seconds and it started increasing for around 10 seconds. Starting from 20+ seconds. After which, it started decreasing again.
Conclusion: Tracing paper covering a plant placed in a beaker of water affects the rate of photosynthesis. (Rate goes slower)
Table:
Time/s 0 10 20 30 40
Amount of Oxygen /g/L 3.725 3.16 3.05 3.15 2.90
Tuesday, August 17, 2010
Lab Report - the one with trashbag
Lab Report – the one with trashbag
Hypothesis : A trashbag covering a plant would affect the rate of photosynthesis
Aim: To test whether light intensity affects the rate of photosynthesis
Approach : A trashbag is been covered over a plant and it is tested whether it affects the rate of photosynthesis
Apparatus : Datalogger x 1 , lamp x1 , oxygen sensor x3 , beaker x3
Materials : Trashbag x1 , Sodium hydrogen carbonate , hydrillas x3
Steps :
1 : Trashbag covered over hydrilla is placed inside a beaker of water
2: Put it in a dark area and wait for 20-30mins
3: Use oxygen sensor and connect it to the datalogger and into the beaker
4:Compare results with the other 2 beakers
5: Form a conclusion and check hypothesis
Experimental error : Did not allow hydrilla to adapt to the sodium hydrogen carbonate, oxygen sensor faulty etc .
Results : The amount of oxygen in the beaker with the hydrilla being covered by the trashbag decreases gradually. In which after 20 seconds, it started increasing for around 3 seconds. After that, it started going down again .
Conclusion : Amount of oxygen decreases which prove that the rate of photosynthesis is being affected by the trashbag covering over the plant .
Time/s 0 10 20 30 40 Amount of oxygen/g/L 8.5 5.5 4.4 4.2 4.0
Lab report 2 - no cover
Lab report 2. ( the one with no covering)
Aims : How light intensity can affect a plant from photosynthesizing.
Hypothesis : The plant can still photosynthesize as there is no restriction of light.
Approach : There will be a total of 3 set-ups. Place hydrilla into a beaker each and place it under the lamp.
( cover two with translucent / opaque. beaker 2 - translucent. beaker 3 - opaque)
wait for 20 - 30 minutes , record the results.
Apparatus : 1 datalogger
3 oxygen sensor
3 beakers
1 lamp
Materials : 3 hydrilla plant
Sodium Hydrogen Carbonate
Variables : type of plant , type of lamp ( colour of light ) ,
heat of the lamp , surroundings.
Procedure : 1) place the hydrilla into the beaker half filled with tapwater.
2) mix two teaspoon of Sodium Hydrogen Carbonate and wait
for 5-10 minutes for it to adapt.
3) place the beaker under the lamp for about 20 - 30 minutes.
4) place the oxygen sensor into the beaker and start recording the results for 50 seconds.
Conclusion : the graph showed that the plant's rate of photosynthesis is uneven even though it wasnt covered.
it went down slightly but rose at 20 seconds but fell at 25 seconds , then it rises again at 26 - 27
seconds. it goes down again slowly in steps , rises , and falls again continuously.
experimental error : the inaccuracy of the results is because we did not let the hydrilla adapt to the
Sodium Hydrogen Carbonate for a short period of time.
Discussions : the inaccuracy of the results shown , was because we did not let it adapt for a while.
another error could be that we did not cover it at all , which allowed the oxygen to go into the
beaker. is it right or wrong to say that ?
Table : (above)
Aims : How light intensity can affect a plant from photosynthesizing.
Hypothesis : The plant can still photosynthesize as there is no restriction of light.
Approach : There will be a total of 3 set-ups. Place hydrilla into a beaker each and place it under the lamp.
( cover two with translucent / opaque. beaker 2 - translucent. beaker 3 - opaque)
wait for 20 - 30 minutes , record the results.
Apparatus : 1 datalogger
3 oxygen sensor
3 beakers
1 lamp
Materials : 3 hydrilla plant
Sodium Hydrogen Carbonate
Variables : type of plant , type of lamp ( colour of light ) ,
heat of the lamp , surroundings.
Procedure : 1) place the hydrilla into the beaker half filled with tapwater.
2) mix two teaspoon of Sodium Hydrogen Carbonate and wait
for 5-10 minutes for it to adapt.
3) place the beaker under the lamp for about 20 - 30 minutes.
4) place the oxygen sensor into the beaker and start recording the results for 50 seconds.
Conclusion : the graph showed that the plant's rate of photosynthesis is uneven even though it wasnt covered.
it went down slightly but rose at 20 seconds but fell at 25 seconds , then it rises again at 26 - 27
seconds. it goes down again slowly in steps , rises , and falls again continuously.
experimental error : the inaccuracy of the results is because we did not let the hydrilla adapt to the
Sodium Hydrogen Carbonate for a short period of time.
Discussions : the inaccuracy of the results shown , was because we did not let it adapt for a while.
another error could be that we did not cover it at all , which allowed the oxygen to go into the
beaker. is it right or wrong to say that ?
Monday, August 16, 2010
Hello! We did our experiment last Friday! :D
We did changes to our experiment, below is the final one.
Aim: To test if the amount of light will affect the rate of photosynthesis (light intensity)
Materials / Apparatus: 1 Tracing paper. (translucent)
1 trashbag. (opaque)
3 beakers, 1 plant inside each beaker.
Steps : 1. Put 1 plant into 1 beaker each. Cover the first beaker with tracing paper.
2. Cover the second beaker with trashbag.
3. Leave the third beaker uncovered.
4. Shine light at the first & third beakers. Put the beaker covered by trashbag in a corner where there is no light.
5. Wait for 20-30 minutes and record the oxygen rate.
6. Study the graph. :)
Report 1 (TRACING PAPER)
The graph is prepared to record the changes in photosynthesis due to different light intensity. It was carried out using a beaker of water with a water plant inside it. The beaker was covered using a piece of tracing paper and light was shone at the beaker.
The experiment was carried out for around 20-30 minutes to see how much a plant can photosynthesize when it is covered with tracing paper.
A graph was recorded after the 20-30 minutes. The graph was recorded for 50seconds.
The graph that was recorded showed a quite smooth line but oxygen decreased from the start until around 20 seconds later. The oxygen then rose and fell again at the 30th second.
It continued decreasing slowly until the 50th second.
___
K bye! The other 2 reports will be up soon.
Be patient! :D
We did changes to our experiment, below is the final one.
Aim: To test if the amount of light will affect the rate of photosynthesis (light intensity)
Materials / Apparatus: 1 Tracing paper. (translucent)
1 trashbag. (opaque)
3 beakers, 1 plant inside each beaker.
Steps : 1. Put 1 plant into 1 beaker each. Cover the first beaker with tracing paper.
2. Cover the second beaker with trashbag.
3. Leave the third beaker uncovered.
4. Shine light at the first & third beakers. Put the beaker covered by trashbag in a corner where there is no light.
5. Wait for 20-30 minutes and record the oxygen rate.
6. Study the graph. :)
Report 1 (TRACING PAPER)
The graph is prepared to record the changes in photosynthesis due to different light intensity. It was carried out using a beaker of water with a water plant inside it. The beaker was covered using a piece of tracing paper and light was shone at the beaker.
The experiment was carried out for around 20-30 minutes to see how much a plant can photosynthesize when it is covered with tracing paper.
A graph was recorded after the 20-30 minutes. The graph was recorded for 50seconds.
The graph that was recorded showed a quite smooth line but oxygen decreased from the start until around 20 seconds later. The oxygen then rose and fell again at the 30th second.
It continued decreasing slowly until the 50th second.
___
K bye! The other 2 reports will be up soon.
Be patient! :D
Thursday, August 12, 2010
Our experiment
Aim : To test whether the amount of light will affect the rate of photosynthesis ( Light intensity)
Materials needed : - 4 Trashbags
- 3 land plants
- 3 beakers
-Light
These are the steps in which how we are carrying out our experiment :
1. Place the 1 of the land plant into 1 of the beaker and cover it over with 1 layer of trashbag
2. Place another plant into another beaker and cover it over with 2 layers or trashbags
3.Leave the last plant into the last beaker (uncovered)
4. Wait for 30mins .
5. Test if the plants whether oxygen is being produced.
6. Compare all the 3 plants and form a conclusion and see whether our hypothesis is right/wrong
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