Explanation: The energy flows in the ecosystem through each tropic level from one organism to another organism. The energy from the sun is used by the plants to make food by the help of the process known as photosynthesis.
The food prepared by the plants is used by the organism at various tropic levels and some amount of the energy is released into the environment in the form of heat.
When the P680 special pair of photosystem II absorbs energy, it enters an excited (high-energy) state. Excited P680 is a good electron donor and can transfer its excited electron to the primary electron acceptor, pheophytin.
