Surface life on Earth could not survive without the Sun as a primary energy source.
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Peer-reviewed biological literature and reference sources confirm that the Sun serves as the primary energy source powering photosynthesis, which produces the essential sugars and organic compounds necessary for animal and human life to survive.
In any attempt to teach the relation of plants to man and the impact of plants on man's past and daily life, the biology teacher should have a clear concept of man's position in the community of living things and his relation to environment. As a background of general knovledge the teacher should recognize for proper perspective that: A. Man and all other animals are in reality guests of plants on this earth, and without green plants as a direct or indirect source of food, animal life would soon cease. Of all living organisms on this planet, green plants alone are able to deal directly with the world's only great source of energy-the sun. They have a monopoly of the business of trapping, converting and storing the sun's energy as food and other products without which man or animals cannot survive. Despite all efforts so far, man has been unable to break this monopoly. Accordingly, photosynthesis is the most basic of all plant-animal relationships, and forms the background for the panorama of life's existence. The chloroplasts have been described as the chief agency which stands between man's eventual starvation and extinction. Although civilized man is a guest of plants he is the arch predator and the pre-eminent deranging and destructive force in Nature. He has always been a disturbing biological force because of his depredations, but within the past century he has also become a major geological force. His construction of huge dams, super-highways, use of atomic power for de
The Sun is the star located at the centre of the Solar System. It is a massive sphere of hot plasma, heated to incandescence by nuclear fusion reactions in its core, radiating the energy from its surface mainly as visible light and infrared radiation with 10% at ultraviolet energies. It is the main source of energy for life on Earth. The Sun has been an object of veneration in many cultures and a
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Those carbohydrates are the energy source that heterotrophs use to power the synthesis of ATP via respiration. Therefore, photosynthesis powers 99 percent of Earth’s ecosystems. When a top predator, such as a wolf, preys on a deer (Figure 8.3), the wolf is at the end of an energy path that went from nuclear reactions on the surface of the sun, to visible light, to photosynthesis, to vegetation, to deer, and finally to the wolf. Photosynthesis is a multi-step process that requires specific wavelengths of visible sunlight, carbon dioxide (which is low in energy), and water as substrates (Figure 8.4). After the process is complete, it releases oxygen and produces glyceraldehyde-3-phosphate (G3P), as well as simple carbohydrate molecules (high in energy) that can then be converted into glucose, sucrose, or any of dozens of other sugar molecules. These sugar molecules contain energy and the energized carbon that all living things need to survive. The following is the chemical equation for photosynthesis (Figure 8.5):
Although the equation looks simple, the many steps that take place during photosynthesis are actually quite complex.
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