Decay And The Carbon Cycle
Visão Geral
Nothing on this planet gets thrown away. A fallen oak leaf, a dead beetle, the shell of an egg, the carbon in your last breath: every one of them is on loan. Give it long enough and the same atoms turn up again inside a root, a seed, a fish or a person. Ecosystems do not run on fresh supplies of matter, because there are none. They run on the same finite stock of elements, used and returned and used again.
This lesson follows one element, carbon, all the way round that loop. You will see how a leaf traps it, how it is passed on when one organism eats another, and how three separate routes send it back to the air: the respiration of plants and animals, the feeding of the microorganisms that rot dead material, and the burning of wood and fossil fuels. You will also learn the conditions that make decay fast or slow, why gardeners turn a compost heap, and why energy alone refuses to go round with the matter.
Objetivos
- Living organisms remove materials from the environment for growth and other processes. These materials are returned to the environment either in waste materials or when living things die and decay.
- Materials decay because they are broken down (digested) by microorganisms. Microorganisms are more active and digest materials faster in warm, moist, aerobic conditions.
- The decay process releases substances that plants need to grow.
- In a stable community, the processes that remove materials are balanced by processes that return materials. The materials are part of a constant cycle.
- The constant cycling of carbon is called the carbon cycle. In the carbon cycle: carbon dioxide is removed from the environment by green plants and algae during photosynthesis; the carbon from the carbon dioxide is used to make carbohydrates, fats and proteins, which make up the body of plants and algae; when green plants and algae respire, some of this carbon becomes carbon dioxide and is released into the atmosphere 26 ; when green plants and algae are eaten by animals and these animals are eaten by other animals, some of the carbon becomes part of the fats and proteins that make up the bodies of the consumers; when animals respire, some of this carbon becomes carbon dioxide and is released into the atmosphere; when plants, algae and animals die, some animals and microorganisms feed on their bodies; carbon is released into the atmosphere as carbon dioxide when microorganisms respire; by the time the microorganisms and detritus feeders have broken down the waste products and dead bodies of organisms in ecosystems and cycled the materials as plant nutrients, all the energy originally absorbed by green plants and algae has been transferred; combustion of wood and fossil fuels releases carbon dioxide into the atmosphere. Students should be able to apply the principles of the carbon cycle.
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- Which group of organisms is mainly responsible for the decay of dead material? A. Green plants B. Animals that eat plants C. Microorganisms such as bacteria and fungi D. Animals that eat other animals Answer: C
- Which combination of conditions gives the fastest rate of decay? A. Cold, dry and aerobic B. Warm, moist and aerobic C. Warm, dry and airless D. Cold, moist and airless Answer: B
- In the carbon cycle, which process takes carbon dioxide out of the atmosphere? A. Respiration B. Combustion C. Decay D. Photosynthesis Answer: D
- Which statement about the carbon cycle is correct? A. Only animals return carbon dioxide to the atmosphere B. Plants, animals and microorganisms all return carbon dioxide by respiration C. Carbon dioxide is returned to the atmosphere only when fuels are burned D. Decomposers remove carbon dioxide from the atmosphere Answer: B
- A pile of dead leaves has a mass of 250 g. After 40 days its mass is 90 g. What percentage of the original mass has been lost? A. 36% B. 44% C. 64% D. 160% Answer: C
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