The Zimbabwe Secondary School Science Project (ZIM-SCI) developed student study guides, corresponding teaching guides, and science kits for a low-cost science course which could be taught during the first 2 years of secondary school without the aid of qualified teachers and environmental laboratories. This ZIM-SCI study guide consists of activities and experiments in which students: (1) identify plant sex cells and sex organs; (2) study the mechanisms of pollination and fertilization; (3) investigate the development and dispersal of seeds and fruits; and (4) observe the life cycles in some plants and animals. Information is provided throughout the unit to help students understand the scientific principles behind the activities and experiments. Because the development of these principles has been carefully designed, it is essential that all experiments, activities, and discussions be done in the exact order in which they appear. (JN)