Biology photosynthesis summary

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Biology photosynthesis summary

Photosynthesis

2.8.1. State that photosynthesis involves the conversion of light energy into chemical energy.

Photosynthesis involves the conversion of light energy into chemical energy.

2.8.2. State that white light from the sun is composed of a range of wavelengths (colors).

White light from the sun is composed of a range of yi on its structure, absorbs different wavelengths that correspond to different shades of color. The remaining wavelengths or colors are reflected and give rise to the percieved color of the plant.

2.8.5. State that light energy is used to split water molecules to give oxygen and hydrogen, and to produce ATP.

Light energy is used to split water molecules to yield oxygen and hydrogen, and to produce ATP.

2.8.6. State that ATP and hydrogen are used to fix carbon dioxide to make organic compounds.

ATP and hydrogen are used to fix carbon dioxide to make organic compounds.

2.8.7. Explain that the rate of photosynthesis can be measured directly by the production of oxygen or the uptake of carbon dioxide, or indirectly by the increase in biomass.

The rate of photosynthesis can be measured directly by the production of oxygen because oxygen is produced as water is split in photosynthesis. The more oxygen, the greater the rate at which photosynthesis is occuring. Carbon dioxide is needed for the Calvin cycle which eventually produces the carbohydrates of photosynthesis. Therefore, the more carbond dioxide, the greater the rate of photosynthesis. An increase in biomass means that more photosynthesis is occuring since the latter produces sugars which increase the biomass of the plant.

2.8.8. Outline the effects of temperature, light intensity and carbon dioxide concentration on the rate of photosynthesis.

An increase in temperature causes an increase in photosynthesis. However, in very high temperatures, the rate of photosynthesis dramatically drops after a period of time, due to the denaturing of key enzymes and proteins. The more light you have, the more photosynthesis occurs, as there is now more energy to drive the reaction. However, light intensity can lead to overly high temperatures and their previously noted damaging effects. Also, the more carbon dioxide you have, the greater the rate of photosynthesis. Carbon dioxide is used as the base molecule that will eventually be converted into a sugar. The greater abundance of it, the more will enter the plant, and the greater the rate at which photosynthesis can proceed.

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