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Photosynthesis - Coggle Diagram
Photosynthesis
Plants make their own food through photosynthesis.
They produce glucose from carbon dioxide and water using light energy.
It's an endothermic reaction.
The light energy needed is absorbed by chlorophyll.
The carbon dioxide enters the leaves through the stomata.
Water enters through the roots and is transported to the leaves in the xylem.
Oxygen is formed as a waste product.
Factors affecting photosynthesis
measuring the rate - the rate of oxygen output, the rate of carbon dioxide uptake, the rate of carbohydrate production.
factors affecting photosynthesis - light intensity, carbon dioxide concentration, temperature
Light intensity - increase in light intensity = increase in the rate of photosynthesis
Carbon dioxide concentration - increase in concentration = increase in rate
Temperature - low temperature = rate is limited, high temperature = enzymes are denatured
Affecting photosynthesis
Water - In the UK this is usually the main limiting factor for photosynthesis.
Light - It fluctuates through the day meaning the rate will change with the time of day.
Carbon dioxide - important limiting factor for photosynthesis.
Temperature - optimum temperature is between 15 and 40 degrees.
Importance of limiting factors
Light - increasing light intensity in greenhouses - use greenhouse constructed of glass, artificial lighting systems
Carbon dioxide - increasing concentration - use paraffin heaters on a small scale, liquid carbon dioxide applied through pipes.
Water - Irrigation systems in greenhouses help to increase yields. Plants in greenhouses are often sprayed with water to keep the humidity high.
Temperature - Heat is often used in greenhouses and makes plant growth possible when the weather is cold outside.