ARTICLE 205 BIOLOGY O LEVEL P1 TOPICAL WORK BOOK

UNIT 15 15.1 Energy flow 15.2 Food chains and food webs 15.3 Carbon cycle 15.4 Nitrogen cycle 15.5 Parasitism 15.6 Effects of humans on the ecosystem 15.7 Pollution 15.8 Conservation 15.9 Multiple Topics Answers Section UNIT 16 16.1 Asexual reproduction 16.2 Sexual reproduction in plants 16.3 Sexual reproduction in humans 16.4 Sexually transmitted diseases 16.5 Multiple Topics Answers Section (O Level Biology Paper) UNIT 17 17.1 Variation 17.2 Chromosomes and DNA 17.3 Monohybrid inheritance 17.4 Selection 17.5 Genetic engineering 17.6 Multiple Topics Answers Section Past Papers May/June 2018 Paper Answers Section