22 terms

B1.5 and B1.6 Biomass Decay and Carbon Cycle

For use in revision of the key terms for Biology AQA Unit 1, B1.5 and B1.6 Biomass, Decay and Carbon Cycle
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biomass
dry mass of living organisms (the mass after all the water has been removed)
pyramid of biomass
A box diagram that starts with a wide box (producer) and smaller and smaller sized boxes that sit above (consumers).The width of the box shows the biomass energy present at that level in the food chain.
food chain
flow diagram showing how energy is passed from one organism to a consumer
animal and plant waste
Types of waste made by organisms includes dead animals, dead plants, urine and faeces
producer
an organism that makes its own food using the energy from the sun e.g. plants and algae. Producers are at the beginning of food chains and also absorb nutrients made from decaying animals, plants and waste.
consumer
any organism that needs to eat another organism (plant or animal) to survive
photosynthesis
chemical reaction occurring in all plants cells that uses sunlight energy to convert carbon dioxide and water into glucose and oxygen. The process removes carbon dioxide from the atmosphere.
respiration
chemical reaction occurring in all cells which converts glucose and oxygen into carbon dioxide, water and heat energy. The process adds carbon dioxide to the atmosphere.
carnivores
animals that only eats meat
herbivores
animals that only eats plants
detritivores
organisms (such as earthworms and maggots) that eat dead or decomposing organisms
decomposers
microorganisms (bacteria and fungi) that complete the decay process
warmth moist oxygen
three environmental conditions that speed up the decay process carried out by detritus feeders and decomposers
not all the animal is eaten
a reason why biomass decreases up the pyramid related to how much of the animal is eaten
biomass lost as animal waste
a reason why biomass decreases up the pyramid that is related to animal faeces and urine
omnivores
Animals that eat plants and meat
combustion (burning) of fossil fuels
chemical reaction which converts fuels (such as coal, gas and petrol) and oxygen into carbon dioxide water and heat energy. The process adds carbon dioxide to the atmosphere.
biomass used up in respiration
A reason why biomass decreases up the pyramid that is related to a chemical reaction that produces heat energy
carbon cycle
a continuous cycle that shows how carbon is moved through the ecosystem by four main processes: photosynthesis, respiration, decay and combustion of fossil fuels
compost bin
a container filled with soil containing microorganisms that decompose dead plants and animal waste. The container has holes to allow oxygen gas to enter. Respiration by the microorganisms releases heat and carbon dioxide into the atmosphere. The soil produced is reach in nutrients tthat can help plants to grow.
apex (or top) predator
an organism that has no natural predators so it resides at the top of the food chain
decay
the process that breaks down (decomposes) dead animals, dead plants and waste by detritivores and decomposers. the process also releases carbon dioxide into the atmosphere (respiration) but returns nutrients back to the ground to help plants grow.
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