B1.6 Waste Materials From Plants And Animals

Mind Map by killthemoment, updated more than 1 year ago
Created by killthemoment over 5 years ago


GCSE Biology (B1) Mind Map on B1.6 Waste Materials From Plants And Animals, created by killthemoment on 08/02/2014.

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B1.6 Waste Materials From Plants And Animals
1 B1.6.1 Decay Processes
1.1 Many trees shed their leaves each year and most animals produce droppings at least once a day. All plants and animals eventually die. Microorganisms play an important part in decomposing this material so that it can be used again by plants. The same material is recycled over and over again and can lead to stable communities.
1.1.1 Living things 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 constantly cycled.
2 B1.6.2 The Carbon Cycle
2.1 The constant cycling of carbon is called the carbon cycle.
2.1.1 Carbon dioxide is removed from the environment by photosynthesis. The carbon from the carbon dioxide is used to make carbohydrates, fats and proteins for plants and algae. When they respire, some of this carbon forms carbon dioxide and is released into the atmosphere. When plants and algae are consumed by animals, some of the carbon becomes part of the fats and proteins that make up their bodies. When animals respire, some of this carbon forms 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 these organisms 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 releases carbon dioxide into the atmosphere.
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