Intended for the study of touch, smell, free surface of water, physical states of water, fusion, evaporation, solidification, boiling, condensation, air, oxygen, carbon dioxide, air expansion, compressibility and elasticity, general and specific properties of matter, animals, seeds, germination, roots, stem, photosynthesis, phototropism, chlorophyll, flower, vegetables, monocotyledons and dicotyledons, irrigation, soil, mineral salts, erosion, food decomposition, mold, fungi, bacteria, harmful effects of smoking, vision, use of lenses, genetics, color blindness, natural selection, separation of mixtures, chemical reaction, movement, trajectory, inertia, heat, temperature, thermoscope, thermal sensation, heat propagation, light, Newton's disk, sound, mechanical waves, Doppler effect, string instrument, phases of the Moon, force, pressure, mechanical, plastic and elastic deformations, simple machine, pulleys, Pascal's principle, communicating vessels, simple pendulum, optics, reflection, refraction, flat and spherical mirror, diopters, electrification, electrical conductors and insulators, simple circuit, series and parallel connection, resistors, color code, compass, magnetic field, magnet, electromagnet, etc.