As part of a series of tests to measure mastery of specific skills in the natural sciences, copies of tests 51 through 65 include: (51) interpreting atomic and mass numbers; (52) extrapolating from a geological map; (53) matching geological sections and maps; (54) identifying parts of the human eye; (55) identifying the functions of parts of a plant; (56) interpreting food test results; (57) applying the theory of mechanical advantage; (58) reading a linear rule; (59) reading a circular scale; (60) predicting ratios in genetics; (61) reading a flow diagram; (62) using a flow chart of physical processes; (63) interpreting a flow chart of operations; (64) using codes; and (65) naming carbon compounds. The multiple choice questions were written for students in grades 7 through 10. Teachers' notes and scoring information are provided for each test. (CM)