Photosynthesis 2

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  • Created on: 10-11-20 21:50
What are the 4 limiting factors of photosynthesis?
1. Temperature
2. Carbon Dioxide Concentration
3. Chlorophyll Concentration
4. Light Intensity
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What limiting factor are we likely to see occur at night?
Light Intensity
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What limiting factor are we likely to see in warm and bright conditions?
Carbon Dioxide Concentration
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What limiting factor are we likely to see in mineral-deficient soil?
Chlorophyll concentration
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What limiting factor are we likely to see during winter?
Temperature
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CO2 concentration, light levels and temperature are all at optimum values. What might be the limiting factor of rate of photosynthesis, and why?
The concentration of mineral ions in the soil is probably the limiting factor.
Chlorophyll absorbs light energy and the production of chlorophyll requires these mineral ions.
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What does lighting and heating in greenhouses increase in farming?
Increasing lighting and heating increases more energy making photosynthesis work at a faster rate. As a result of this, farmers will create more plants and therefore have a bigger crop yield.
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What's one problem that farmers have to manage when they start to increase lighting and heating in greenhouses?
They have to evaluate the trade-off between the costs of lighting and heating and the rate of photosynthesis. Farmers may find it too expensive to get lighting and heating to compete with crop yields.
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What 5 things can glucose be converted into?
(An easy way to remember this is CROPS)
1. Cellulose
2. Respiration
3. Oils and Fats
4. Proteins
5. Starch
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When glucose converts into starch, what is the starch used for?
As starch is insoluble, it is stored in the stem, leaves and roots for energy use.
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When glucose converts into cellulose, what is the cellulose used for?
Cellulose is used to strengthen the cell walls in a plant. This can be very useful for fast-growing plants that need stability.
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When glucose converts into proteins, what are the proteins used for?
Proteins are essential for the growth and repair of a cell. For glucose to convert into proteins, it needs a special nutrient called nitrogen- this can be absorbed via nitrate ions in the soil.
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What is the test for photosynthesis?
You will use an aquatic plant (pondweed) and put it under water. A lamp will be shone on it at different distances (light intensity) and you will record how many bubbles that were produced per set time (3 per 30 seconds).
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What will be the independent and dependent variable in the photosynthesis test?
Independent (what is changed) - the light intensity
Dependent (what is measured) - the number of bubbles per set time
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Why should you wait a few minutes after setting the experiment up before you start to collect your results?
The pondweed needs to acclimatise to the new environment to increase the validity of the results.
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What is likely to happen if the lamp is moved closer to the pondweed in the photosynthesis test?
Rate of photosynthesis will increase because light intensity has increased.
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What gas will be inside the bubbles produced in the photosynthesis test?
Oxygen (this is the product of photosynthesis)
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What is the 'Inverse Square Law' ?
light intensity= 1 ÷ (distance squared)
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What do the terms accuracy, reliability and validity mean?
Accuracy- how close a measured value is to it's actual value.

Reliability- the ability of an experiment to produce consistent results.

Validity- how appropriate the experimental method is at achieving the aim of the experiment.
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How could you increase the reliability of the test on photosynthesis?
Measuring the rate of photosynthesis multiple times during the experiment.
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In the test for photosynthesis, why is measuring the amount of bubbles per set time an invalid experimental method?
Not all the bubbles will contain oxygen. This is because plants are consistently respiring so carbon dioxide is being produced too. However, the assumption that oxygen is in all the bubbles allows us to have an educated estimate on the rate of photosynthe
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How can the limitation of accuracy be seen in the test for photosynthesis?
The bubbles produce at speed so, trying to count all the bubbles is very hard- this limits the accuracy of the correct value of bubbles.
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Other cards in this set

Card 2

Front

What limiting factor are we likely to see occur at night?

Back

Light Intensity

Card 3

Front

What limiting factor are we likely to see in warm and bright conditions?

Back

Preview of the front of card 3

Card 4

Front

What limiting factor are we likely to see in mineral-deficient soil?

Back

Preview of the front of card 4

Card 5

Front

What limiting factor are we likely to see during winter?

Back

Preview of the front of card 5
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