explain photosynthesis
plants and photosynthesisGreen plants make their own food
photosynthesis 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
Elements, mixtures and compounds
Electricity

Energy
Forces
Genetics

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

light and photosynthesis

 

Carbon dioxide in photosynthesis

Plants get carbon dioxide from the air through their leaves. The carbon dioxide diffuses through small holes in the underside of the leaf called stomata. (singular: stoma. plural: stomata)

The lower part of the leaf has loose-fitting cells, to allow carbon dioxide to reach the other cells in the leaf. This also allows the oxygen produced in photosynthesis to leave the leaf easily.

stoma


Carbon dioxide is present in the air we breathe, at very low concentrations. Even though it forms about .04% of the air, it is a needed factor in light-independent photosynthesis.

In higher concentrations, more carbon is incorporated into carbohydrates, therefore increasing the rate of photosynthesis in light-independent reactions.

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green plants make their own food