B3 revision 0.0 / 5 ? BiologyLife on earthGCSEOCR Created by: CharlabbottxoCreated on: 11-05-17 19:36 When may a species become extinct? Increased competition, new predators, new diseases 1 of 28 What does a food chain show? Feeding relationship between organisms 2 of 28 What do food webs show? How all food chains in a habitat are inter-related, interdependance 3 of 28 Where do all living things get their energy from? The sun 4 of 28 When do plants absorb sun energy? Photosynthesis 5 of 28 When is energy transferred to other organisms? Eaten or decomposed 6 of 28 What is an ecosystem? Area containing self sustaining community of organisms and their physical surroundings 7 of 28 What is an autroph? They are self feeders 8 of 28 What is a heterotroph? Unable to make their own food 9 of 28 Where does energy go at different stages of the food chain? Lost through heat, respiration, Excreted as waste products, Trapped in materials 10 of 28 How to calculate energy efficiency? percentage of energy = input divided by output x 100 11 of 28 When did life on earth begin? 3500 million years ago 12 of 28 What does fossil evidence support? Common ancestor theory 13 of 28 What have humans developed from? Mice, chimpanzees 14 of 28 What was Charles Darwin theory? Theory of evolution, variation, competition, adaptation and genes passed 15 of 28 What is selective breeding? Animals with certain traits are mated to produce desirable offspring 16 of 28 What is biodiversity? Variety of life that exists on earth 17 of 28 What are kingdoms? Large groups 18 of 28 What is sustainable? Capable to be continued with minimul long term effect to the environment 19 of 28 What is biodegreadable? Material that decomposes naturally 20 of 28 How is carbon dioxide removed from the air? Photosynthesis 21 of 28 What is combustion? Burning, releases fossil fuels 22 of 28 How are dead material and waste products broken down? Bacteria and fungi because they're decomposer organisms 23 of 28 How is nitrogen removed? By excretion 24 of 28 After death, what happens to plants and animals? They're decomposed by decay organisms 25 of 28 How is nitrogen in the air removed? Nitrogen fixing bacteria 26 of 28 What happens to nitrates when they're taken by plant roots? Converted to protein 27 of 28 What is denitrification? Nitrates can be broken down into nitrogen 28 of 28
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