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Nonharmonic and parametric resonance in man's hearing and sight organs are considered. For the first time for combination tones omega 2-omega 1 and 2 omega 1-omega 2 arising in hearing organs under low intensities of an acoustic signal the parametric equations are suggested to explain the properties of these tones. On the basis of the experimental data of the nonharmonic sight the scheme of cis-trans-isomerization of the chromophore group (retinal) of visual pigments under simultaneous absorption of two infrared photons is suggested. Possible appearance of nonharmonic resonances in other biological systems is analysed.