What factors affect the rate of decay of dead organisms?Temperature, water, lightTemperature, water, oxygenTemperature, water, carbon dioxideLight, water, oxygen2What causes the temperature to rise in an open compost bin? Photosynthesis carried out by dead plants in the compostWarm rain water heats up the compostRespiration of microorganisms in the compostThe sun heats up the compost3Anaerobic decay takes place in a biogas generator. What gas is produced?OxygenPropaneMethaneCarbon dioxide4Which of the following methods for preserving food involves the removal of oxygen?IrradiationFreezingVacuum packingDehydration

Organisms that eat dead and decaying plants and animals*1 pointare decomposershelp keep the Earth clean from waste piling upreturn nutrients from dead organic matter to the soilall of the above

Decomposition is a physical and chemical process by which dead organic matter is broken down. Why is decomposition important to life processes?

When a living organism dies, why does it become cold? A. because all of the internal chemical reactions have stopped so no heat is being released B. because there are too many chemical reactions taking place C. because the chemical reactions inside of it are speeding up faster and faster

How does most of the carbon in an organism's body return to the environment after the organism dies?*2 puntosHeat from the sun causes the carbon in the body to evaporateDecomposers break the body down into simpler compoundsGeological processes cause the body to turn into a fossil fuelRain water dissolves the carbon in the body and carries it to the ocean.

What is the name for organisms such as maggots and worms that feed on dead matter? PredatorsConsumersProducersDetritivores2Why are nitrates important in living organisms? For fertilisationTo aid the process of decayTo make proteinsFor photosynthesis3One of the stages of the water cycle is percolation. What is this?Trickling of water through gaps in soils and rocksLoss of water vapour from plantsLoss of water from cloudsWarming of water on the Earth’s surface by the sun4Which of the following is the correct order for four key stages of the water cycle? Percolation, condensation, precipitation, evaporationEvaporation, condensation, precipitation, percolationEvaporation, precipitation, percolation, condensationPercolation, precipitation, condensation, evaporation5Which of the following processes that return carbon to the atmosphere is not a natural activity?DecompositionDecayCombustionRespiration6Which of the following remove carbon dioxide from the atmosphere?PlantsDecomposersDetritivoresAnimals