explain photosynthesis


Green plants make their own foodphotosynthesis in green plants
what is light reactions and dark reactions
The internal structure of a leaf
What conditions are needed for photosynthesis
The chloroplast
CO2 for photosynthesis
Sunlight for photosynthesis
Water and photosynthesis
The root structure

OTHER LESSONS
Asexual Reproduction
Clouds
Charact' of Living Things
Ecosystems
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Energy
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Genetics

Needs of Living Things
Nutrients in Food
Rock Cycle
Simple Machines
Soils
States of Matter
Symbiosis
The Five Senses
Water Cycle
Winds

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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