Biology Topic 7, 8


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T7- What is the function of photosynthesis?
It produces glucose by converting sunlight into chemical energy. (released through respiration.)
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T7- Where does the process of photosynthesis take place?
In the chloroplasts in leaf cells. (chloroplasts are concentrated in the pallisade cells.)
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T7- What is the chemical equation for photosynthesis?
6H2O + 6CO2 ----> C6H12O6 + 6O2
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T7- Describe the order/structure of a leaf.
Waxy cuticle and upper epidermis. Pallisade mesophyll layer. Spongy mesophyll layer. Lower epidermis. Waxy cuticle and guard cells/stomata.
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T7- How are leaves adapted for efficient photosynthesis?
Broad- larger SA exposed to light. Chloroplasts in pallisade- easily reach light. Upper epidermis is transparent- light can reach pallisade. Waxy cuticle reduces water loss. Gases diffuse from stomata. Vascular bundle bring nutrients, take glucose.
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T7- What is a limiting factor?
Stop photosynthesis happening at a faster rate and is dependent on the environment.
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T7- What would the graph look like for rate of photosynthesis if you changed light intensity, but kept CO2 and temperature the same.
It would initially rise, but reach a peak rate, when carbon dioxide and temperature now become the limiting factors, since they are fixed.
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T7- What would the graph look like for rate of photosynthesis if you changed CO2, but kept light intensity and temperature the same.
At the beginning, the rate of ps would proportionally rise with the CO2, but would reach a peak where light and temperature would be limiting factors as they do not increase with it.
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T7- What would the graph look like for rate of photosynthesis if you changed temperature, but kept CO2 and light intensity the same.
As the temperature increases, the rate would increase initially. When the temperature is raised too high, the enzymes in the plant would de-nature, slowing the reaction down.
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T8- Describe the process to test a leaf for starch.
1) kill the plant by dunking it in boiling water, so that the reactions in the leaf cease. 2) Heat the leaf with ethanol in a tube, turning it white. 3) rinse the leaf in cold water and add iodine solution. Blue/black is positive.
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T8- What is an experiment to show the effects of chlorophyll on photosynthesis?
Take a variegated leaf, and record which parts are green (containing chlorophyll.) Expose these leaves on the plant to light, After a day or two, Use the iodine starch test (as photosynthesis produces starch,) the green parts will be blue/black.
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T8- What is an experiment to show the effects of CO2 on photosynthesis?
Place a plant in a bell jar with soda lime which absorbs and removes the carbon dioxde. Have a light shining through the bell jar, and a constant temperature. When you test the leaves, starch will not be present.
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T8- What is an experiment to show the effects of light on photosynthesis?
Place the plant in a cupboard with constant carbon dioxide, temperature, water etc. There will be no starch present when tested.
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T8- What can the rate of photosynthesis be indicated by?
the rate at which oxygen is produced (products formed rate.)
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T8- What would be the independent variable in the light-distance experiment?
The distance in cm/mm of the light source from the test tube.
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T8- What would be the dependent variable in the light-distance experiment?
The volume of oxygen given off from the Canadian pondweed in a set time(collected in gas syringe.)
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T8- What would be the control variables in this experiment?
The temperature, the CO2 provided, the same light source, same time left for, the samee species/type/size.amount of pondweed.
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Card 2

Front

T7- Where does the process of photosynthesis take place?

Back

In the chloroplasts in leaf cells. (chloroplasts are concentrated in the pallisade cells.)

Card 3

Front

T7- What is the chemical equation for photosynthesis?

Back

Preview of the front of card 3

Card 4

Front

T7- Describe the order/structure of a leaf.

Back

Preview of the front of card 4

Card 5

Front

T7- How are leaves adapted for efficient photosynthesis?

Back

Preview of the front of card 5
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