Photosynthesis

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  • Created by: Brooklyn
  • Created on: 09-01-14 23:03
What do green plant use and what for?
They use light energy to make their food.
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Where do they obtain the new materials from?
In order to make food they obtain new materials from the soil (water) and the atmosphere (carbon dioxide)
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Give the equation for photosynthesis
Carbon dioxide + water (+light intensity) ----------> Glucose + Oxygen
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How is the light energy absorbed?
It is absorbed by the green pigment called CHLOROPHYLL
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Where is chlorophyll found?
Chlorophyll is found in chloroplasts in some plant and algae.
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How is the light energy used?
The light energy is used to convert the carbon dioxide into GLUCOSE. OXYGEN is released as a by-product.
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Give 6 ways in which plants are adapted to carry out photosynthesis...
Leaves are broad- big surface area for light to fall on. Contain chlorophyll in chloroplasts to absorb light energy. Air spaces- allow carbon dioxide to get to the cells and oxygen to leave. PTO
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Veins- bring plenty of water to the cells of the leaves. Leaves are spread out- all mesophyll cells can absorb the most light they can. Leaves are thin- light can be absorbed all the way through. PTO
Also it is a shorter distance for carbon dioxide to travel; therefore diffusion time more efficient.
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What is a limiting factor?
A limiting factor is something that slows down or stops a reaction even when other factors are in full supply.
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Give 3 factors the rate of photosynthesis may be limited by-
Low temperature, Shortage of carbon dioxide and low light intensity.
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What is the amount of photosynthesis determined by?
It is determined by whichever raw material is in short supply.
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Why is light needed in photosynthesis?
Light is needed in photosynthesis to provide the energy for the process of photosynthesis.
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What is the affect of light on photosynthesis rate?
The brighter the light, the greater the rate of photosynthesis.
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Why is carbon dioxide needed in photosynthesis?
Carbon dioxide is needed in photosynthesis to make glucose.
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What is the affect of carbon dioxide on photosynthesis rate?
The higher the concentration of carbon dioxide, the faster the rate of photosynthesis.
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What can be done to the level of carbon dioxide in greenhouses?
The carbon dioxide in the air can be artificially raised and this can increase the rate of photosynthesis. Farmers use this as a method of increasing the rate of plant growth.
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Why is the temperature important in photosynthesis?
Temperate has an effect on all chemical reactions.
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What is the affect of temperature on the photosynthesis rate? And why?
As the temperature increases, so does the rate of photosynthesis This is because the molecules have more kinetic energy, so more collisions take place.
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What is photosynthesis controlled by?
It is controlled by enzymes.
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What are enzymes?
Enzymes are proteins that denature (destroyed) above 40 degrees C.
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What affect will these enzymes have on photosynthesis?
If the temperature goes to high so the enzymes become denatured, the rate of photosynthesis willl fall because the enzymes controlling it are destroyed.
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What is the glucose produced in photosynthesis used for?
Converted into insoluble starch for storage. Used for respiration. Used to produce fat or oil for storage. Used to produce cellulose, which strengthens the plant cell wall. Used for proteins (Plants also use nitrate oils absorbed in soil)
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Other cards in this set

Card 2

Front

Where do they obtain the new materials from?

Back

In order to make food they obtain new materials from the soil (water) and the atmosphere (carbon dioxide)

Card 3

Front

Give the equation for photosynthesis

Back

Preview of the front of card 3

Card 4

Front

How is the light energy absorbed?

Back

Preview of the front of card 4

Card 5

Front

Where is chlorophyll found?

Back

Preview of the front of card 5
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