Grains, seeds, fruits and other agriculture products have nonregular shape. Except of that they have also nonhomogeneous structure and built (i.e. two cotyledons). These two factors among others affected strength of plant material. Rapeseeds are regarded as balls. In fact their shape is similar to the ball, but measuring individual seed in three planes, it is easy to notice differences between dimensions. Each seed consisted of skin, two cotyledons and germ. This anatomical built as well as geometrical dimensions influence on mechanical properties. However, in this considerations shape of seeds was neglected and only inner built was under study. The quasi-static compression test was carried out on individual seed. Seeds were orientated in respect to the dividing plane of cotyledons. Compression curves were registered in force-deformation coordinate system. Maximal damaging force with corresponded deformation as well as damaging energy and modulus of elasticity were calculated. Investigations confirmed differentiated strength features of rapeseed in various plains. The differences were statistically significant and the highest mechanical parameters occurred for position, in which compression force acted perpendicular to the dividing plane of cotyledons.