A description of hand sectioning techniques has been added so that students may prepare some of their own materials. Students study flower structure, gamete formation and fertilization. New sections have been added on plant callus culture and hormone effects on cell differentiation. Another new section provides directions for testing the effects of giberellins on Wisconsin Fast Plant mutant dwarf strains. Section 5 Investigating Animal Form and Function Investigating the Digestive and Gas Exchange Systems .
Students start their dissection of the fetal pig integrating microscopic and gross anatomy.
They investigate the feeding behavior of Hydra and measure human lung capacities using a respirometer. Investigating Circulatory Systems . Material has been rearranged to proceed from invertebrate to vertebrate anatomy integrating microscopic and gross anatomy of the fetal pig. A new section on the histology of blood has been added. Investigating the Excretory and Reproductive Systems .