Occurs in the cell walls, sugars manufactured by chlorophyll, as well as chlorophyll itself. Carbon constitutes approximately 50% of a plant's dry weight. (H) Hydrogen

Important in nutrient cation exchange (the chemical reaction which causes roots to uptake nutrients) and in plant-soil relations. Hydrogen is also essential for the formation of sugars and starches and is easily obtained from water. Water also keeps the plants structure rigid through what is known as turgor pressure, notice when a plant is lacking water it will begin to lose turgor pressure and wilt. (O) Oxygen

Required to form sugars, starches and cellulose. Oxygen is essential for the process of respiration which provides energy plants utilize to grow. (N) Nitrogen

Necessary for the formation of amino acids, co-enzymes and chlorophyll.

For a plant to develop properly, it must have access to all the necessary elements. Because these four elements occur naturally, most people rarely consider them when discussing plant nutrition. It should be stressed that the exclusion or depletion of any one of these elements would cause death of the organism. Just as you are what you eat, so are your plants so feed them a well balanced diet.

The composition of Earth's atmosphere

□ Nitrogen «Oxygen □ Carbon Dioxide

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