The Sun as a Source of Energy (Cambridge (CIE) O Level Biology) : Revision Note
Transfer of Energy
Transfer of Energy
The Sun is the principal source of energy input to biological systems
All energy transfers on Earth can be traced back to the Sun
Solar energy powers photosynthesis
So all life depends, directly or indirectly, on photosynthesis
Flow of Energy from the Sun to Earth Diagram

Around half of the Sun's energy that enters the atmosphere reaches the surface. Some of this energy powers photosynthesis which all life depends upon.
Energy flows through living organisms
Including light energy from the Sun and chemical energy in organisms
Energy is eventually transferred to the environment eg. as heat
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