Ecology

3. shows how energy is transferred up food chains that are interlinked with other food chains.
7. graphical representation of the energy found within the trophic levels of an ecosystem.
8. the process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a byproduct.
9. the chemical processes by which atmospheric nitrogen is assimilated into organic compounds, especially by certain microorganisms as part of the nitrogen cycle.
11. microbial process of reducing nitrate and nitrite to gaseous forms of nitrogen
12. any of the natural pathways by which essential elements of living matter are circulated
13. waste or debris of any kind.
15. Make nutrients from carbo dioxide
17. Limiting nutrient
18. an organism that derives the organic compounds and energy it needs from the consumption of other organisms; a heterotroph.

1. each of several hierarchical levels in an ecosystem, comprising organisms that share the same function in the food chain and the same nutritional relationship to the primary sources of energy.
2. a hierarchical series of organisms each dependent on the next as a source of food.
4. the synthesis of organic compounds by bacteria or other living organisms using energy derived from reactions involving inorganic chemicals, typically in the absence of sunlight.
5. organisms that acquire their energy from sunlight and materials from nonliving sources
6. plankton consisting of microscopic plants.
10. an organism deriving its nutritional requirements from complex organic substances.
14. a substance that provides nourishment essential for growth and the maintenance of life.
16. organic matter used as a fuel, especially in a power station for the generation of electricity.