The article describes the presupposed physical mechanism of solar activity effect on molecular processes taking place on the Earth. It is derived from the well-known fact that weekly low magnetic fields can have selective effect on radical chemical reactions. There are several methods to bring the exited molecular system to the main quiescent state, depending on its orientation of electron spins. The magnetic fields causing changes in orientation of electron spins regulate the process of transition of exited molecular system to the quiescent state. Biological systems are characterized by such biochemical processes as photosynthesis, mitochondrial respiratory chain, etc. Magnetic field does not bring additional energy to the system but only directs the chain of biochemical reactions to certain trajectory.  

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