Difference between revisions of "Photosynthesis"
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*[[Temperature]] - [[Photosynthesis]] works best at 30[[°C]]. Too much colder or too much warmer and [[photosynthesis]] will slow down. | *[[Temperature]] - [[Photosynthesis]] works best at 30[[°C]]. Too much colder or too much warmer and [[photosynthesis]] will slow down. | ||
*[[Carbon Dioxide]] - [[Photosynthesis]] needs [[Carbon Dioxide]]. The more [[Carbon Dioxide]], the quicker [[photosynthesis]] can happen. | *[[Carbon Dioxide]] - [[Photosynthesis]] needs [[Carbon Dioxide]]. The more [[Carbon Dioxide]], the quicker [[photosynthesis]] can happen. | ||
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| + | ===Photosynthesis and the Atmosphere=== | ||
Revision as of 09:23, 20 September 2018
Contents
Key Stage 1
Meaning
Photosynthesis is how plants make their own food.
Key Stage 2
Meaning
Photosynthesis is a process that plants use make their own food using the sunlight.
About Photosynthesis
- Photosynthesis is what makes plants producers as they are able to make their own food.
- Without sunlight plants cannot do photosynthesis.
- Plants cannot survive for very long without sunlight or they will run out of food.
Key Stage 3
Meaning
Photosynthesis is the process that takes place in the chloroplasts in cells which uses Carbon Dioxide and Water to produce Glucose and Oxygen using the energy transferred to the organism by sunlight.
Word Equation
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| The word equation for photosynthesis showing Carbon Dioxide and Water reacting together in the presence of light to produce Glucose and Oxygen. |
Symbol Equation
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| The balanced symbol equation for photosynthesis showing 6 Carbon Dioxide and 6 Water molecules reacting together in the presence of light to produce 1 Glucose and 6 Oxygen molecules. |
About Photosynthesis
- Photosynthesis takes place in the chloroplast.
- Chlorophyll is a catalyst for photosynthesis.
- Without chlorophyll, photosynthesis cannot happen.
Adaptations for Photosynthesis
- Plants have evolved an organ called a leaf which is specially adapted for photosynthesis.
- Leaves are thin and wide to create a large surface area to collect light.
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- The leaf has Xylem vessels to supply water collected by the roots.
- The leaf has air gaps to allow carbon dioxide and oxygen to flow through the leaf.
- The leaf has a layer of palisade cells which have lots of chloroplasts inside for photosynthesis.
- The leaf has guard cells and stomata which can open and close. This way if the leaf gets dehydrated the stomata will close and stop carbon dioxide getting in, stopping photosynthesis.
Factors Affecting Photosynthesis
- Light - The more light, the faster photosynthesis can happen.
- Water - Photosynthesis needs water. If there is not enough water photosynthesis will slow down.
- Temperature - Photosynthesis works best at 30°C. Too much colder or too much warmer and photosynthesis will slow down.
- Carbon Dioxide - Photosynthesis needs Carbon Dioxide. The more Carbon Dioxide, the quicker photosynthesis can happen.