Let F be a field of characteristic ≠2 and φ be a quadratic form over F. By X φ we denote the projective variety given by the equation φ=0. For each positive even integer d≥8 (except for d=12) we construct a field F and a pair φ, ψ of anisotropic d-dimensional forms over F such that the Chow motives of X φ and X ψ coincide but . For a pair of anisotropic (2 n -1)-dimensional quadrics X and Y, we prove that existence of a rational morphism Y→ X is equivalent to existence of a rational morphism Y→ X.