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Photosynthesis Energy Genetics reproduction Ecosystems

light and photosynthesis

 

Light for photosynthesis

A leaf usually has a large surface area, so that it can absorb a lot of light. Its' top surface is protected from water loss, disease and weather damage by a waxy layer. The upper part of the leaf is where the light falls, and it contains a type of cell called a palisade cell. This is adapted to absorb a lot of light. It has lots of chloroplasts.
light for photosynthesis

In light-dependent reactions (as explained in light and dark reactions), photosynthesis increases with more light. More chlorophyll molecules are ionised and more ATP and NADPH are generated as more light photons are focussed on a green leaf. Even though light is extremely important in light-dependent reactions, it is important to note that excessive light can damage chlorophyll and photosynthesis can reduce.

Light-dependant reactions do not rely too much on temperature, water or carbon dioxide, even though they are all necessary for the process to complete. This means cold or hot, the reactions will occur as long as there is enough light.


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green plants make their own food



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