205 O Level Biology Paper 1 MCQ’s Topical Worked Solutions

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205 O Level Biology Paper 1 Topical MCQ’s All variants Classified to Sub Topics Mark schemes References of repeated questions added Questions order new to old Worked Solutions TABLE OF CONTENTS UNIT 1 CELLS 1.1 Plant and animal cells 1.2 Specialized cells, tissues and organs 1.3 Multiple Topics Answers Section UNIT 2 CLASSIFICATION 2.1 Characteristics Of Living Organisms 2.2 Concept And Use OF A Classification System 2.3 Features Of Organisms 2.4 Dichotomous Keys Answers Section UNIT 3 MOVEMENT INTO AND OUT OF CELLS 3.1 Diffusion And Osmosis 3.2 Active Transport 3.3 Multiple Topics Answers Section UNIT 4 BIOLOGICAL MOLECULES Answers Section UNIT 5 5.1 Enzymes Action 5.2 Effects of temperature and pH Answers Section UNIT 6 PLANT NUTRITION 6.1 Photosynthesis 6.2 Leaf Structure 6.3 Mineral Nutrition Answers Section UNIT 7 TRANSPORT IN FLOWERING PLANTS 7.1 Water And Ion Uptake 7.2 Transpiration And Translocation 7.3 Multiple Topics Answers Section UNIT 8 HUMAN NUTRITION 8.1 Nutrients 8.2 Diet 8.3 World Food Canal 8.4 Human Alimentary Canal 8.5 Chemical Digestion 8.6 Absorption And Assimilation 8.7 Multiple Topics Answers Section UNIT 9 GAS EXCHANGE IN HUMANS Answers Section UNIT 10 RESPIRATION 10.1 Respiration 10.2 Aerobic Respiration 10.3 Anaerobic Respiration 10.4 Multiple Topics Answers Section UNIT 11 TRANSPORT IN HUMANS 11.1 Circulatory System 11.2 Multiple Topics Answers Section UNIT 12 DISEASES AND IMMUNITY Answers Section UNIT 13 EXCRETION IN HUMANS Answers Section UNIT 14 COORDINATION AND CONTROL 14.1 Receptors 14.2 Reflex Action 14.3 Hormones 14.4 Homeostasis 14.5 Multiple Topics Answers Section UNIT 15 COORDINATION AND RESPONSE IN PLANTS Answers Section UNIT 16 DEVELOPMENT OF ORGANISMS AND CONTINUITY OF LIFE 16.1 Nuclear Division / Asexual And Sexual Reproduction 16.2 Sexual reproduction in plants 16.3 Sexual reproduction in humans 16.4 Multiple Topics Answers Section UNIT 17 INHERITANCE 17.1 Variation 17.2 Chromosomes And DNA 17.3 Monohybrid Inheritance 17.4 Selection 17.5 Multiple Topics Answers Section UNIT 18 BIOTECHNOLOGY AND GENETIC MODIFICATION 18.1 Biotechnology And Genetic Modification 18.2 Biotechnology 18.3 Genetic Engineering ANSWER SECTION UNIT 19 RELATIONSHIP OF ORGANISMS WITH ONE ANOTHER AND WITH THE ENVIRONMENT 19.1 Energy Flow 19.2 Food Chains And Food Webs 19.3 Carbon Cycle 19.4 Nitrogen Cycle 19.5 Parasitism 19.6 Effects Of Humans On The Ecosystem 19.7 Pollution 19.8 Conservation 19.9 Multiple Topics ANSWER SECTION