B4 Key Facts 0.0 / 5 ? BiologyCommunity Level SystemsGCSEOCR Created by: Mayah7113Created on: 29-09-19 17:41 Producers Organisms that make their own food by photosynthesis. 1 of 28 Consumers Organisms that cannot make their own food and have to eat other organisms 2 of 28 Decomposers Consumers that get their energy by feeding off dead or decaying material 3 of 28 Ecosystem All of the organisms and physical conditions in an area 4 of 28 Community The organisms within an ecosystem 5 of 28 Habitat An area where an organism lives 6 of 28 Population The number of individuals of a species living in an area 7 of 28 Biomass The mass of living material present in an organism 8 of 28 Food chains and webs Help display what an organism eats 9 of 28 Trophic level Each step of a food chain 10 of 28 Biotic factors The living things in an ecosystem 11 of 28 Abiotic factors The non-living things in an ecosystem 12 of 28 Predation A relationship between apredator and its prey 13 of 28 Mutualism Both organisms benefit from the interaction 14 of 28 Parasitism One organism lives off the other; only the parasite benefits 15 of 28 A pyramid of biomass Represents the amount of biomass present at each trophic level 16 of 28 Egestion The removal of undigested material in the form of faeces 17 of 28 Nutrient Cycling The movement of materials between the biotic and abiotic components of an ecosystem 18 of 28 How does water move through the atmosphere? Through evaporation and transpiration. 19 of 28 How are clouds formed? Water vapour in the air condenses. 20 of 28 Precipitation How water returns to the ground. 21 of 28 How is nitrogen removed from the air? By nitrogen fixing bacteria. 22 of 28 How is nitrogen returned to the air? By denitrifying bacteria. 23 of 28 How is ammonia converted to nitrates? Ammonia in the soil is converted into nitrates by nitrifying bacteria. 24 of 28 The carbon cycle The process by which carbon is cycled through the environment 25 of 28 How is carbon dioxide removed from the environment? By photosynthesis 26 of 28 How is carbon dioxide released into the environment? By respiration, decomposition and burning fossil fuels. 27 of 28 Detrivores Small animals that break down organic waste into small pieces. 28 of 28
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