Computers & Science - Part 4
Definition and main principles of photosynthesis
Photosynthesis is a process of producing organic agents out of carbon dioxide and water with the help of sunlight and special photosynthetic pigments (chlorophyll in plants and bacteriochlorophyll or bacteriorhodopsin in bacteria). Plants, many algae and bacteria (with the exception of archaea) are able to feed themselves with the help of photosynthesis, that is why they are called photoautotrophs. Since the waste product of this process is oxygen, photosynthesis is vital for all the living and breathing organisms on the Earth.
You have definitely heard of such ecological problem as acid rain, yet when asked about its nature most people are at a loss. Acid rain is the so-called by-product of certain industries and vehicles. They emit sulphur dioxide and nitrogen oxides which under the influence of the sun and moisture change into sulphates and nitrates and then into sulphuric and nitric acid that come down as acid rain. This phenomenon seems to have a variety of negative effects on our lives.