Crop Production and Management: How are different food crops produced? What are the various foods we get from animal sources? Crop production: Soil preparation, selection of seeds, sowing, applying fertilizers, irrigation, weeding, harvesting and storage; nitrogen fixation, nitrogen cycle.
Synthetic Fibres and Plastics: Are some of our clothes synthetic? How are they made? Where do the raw materials come from? Do we use other materials that are synthetic? Do we use cloth (fabric) for purposes other than making clothes to wear? What kind of fabric do we see around us? What are they used for?
Force and Pressure: What happens when we push or pull anything? How can we change the speed, direction of a moving object? How can we shape the shape of an object? Why are needles made pointed? Why does a balloon burst if too much air is blown into it? Why does an inverted glass/bottle/pitcher resist being pushed down into water? How can air/liquids exert pressure?
Sound: How do we communicate through sound? How is sound produced? What characterises different sounds? Various types of sound; sources of sound; vibration as a cause of sound; frequency; medium for propagation of sound; idea of noise as unpleasant and unwanted sound and need to minimise noise.
Light: What are the differences between the images formed on a new utensil and an old one? Why is there this difference? When you see your image in the mirror it appears as if the left is on the right – why? Why don’t we see images on all surfaces around us? What makes things visible?
Stars and the Solar System: What do we see in the sky at night? How can we identify stars and planets? Idea about heavenly bodies/celestial objects and their classification – moon, planets, stars, constellations. Motion of celestial objects in space; the solar system.