PT Journal AU Hrabi, L SO e-Pedagogium PY 2002 BP 19 EP 25 VL 2 IS 2 DE Biology textbooks; evaluation of the text difficulties; density of the scientific information. AB This article contains knowledge about evaluation of the text difficulties of six present Czech biology textbooks for the seventh year of the primary education. The evaluation methods were realized according to Prucha. Obtained results show - the textbook of Jinan publishing company and the textbook of Scientia publishing company were not as difficult as the others (text difficulties made 26,42 points and 29,04 points). The density of the scientific information achieved similar values: 24,43 % and 25,46 %. ER