The National Curriculum for Science has four strands – Biology, Chemistry, Physics and Working Scientifically. Knowledge and understanding is gained through practical investigations, which starts with Year 1 children and continues through to Year 6. Topics are revisited to consolidate learning and to practise the skills of questioning, predicting, experimenting, recording and considering evidence to draw conclusions gained during investigations. For example, growing flowers and naming the basic structures of flowering plants with Year 1 children will gradually progress to work during Key Stage 2 on pollination, seed formation and seed dispersal.