Ecosystems

2. Large areas of the earth dominated by a specific type of vegetation
4. In a food chain humans are normally the top level ......
6. The primary consumer is usually a......
7. All organisms including different species in an ecosystem
8. Most light energy from the sun is lost before it enters the .........
10. Can occur when living things cannot decay after death
11. A type of interaction between organisms when they require the same resource e.g. food, shelter
12. In an energy flow diagram only ....% of energy is passed to the next trophic level
13. All the organisms of a particular species in an ecosystem
15. Organisms that break down dead matter
20. releases carbon dioxide into the atmosphere when fossil fuels are burnt
22. Name the plants with root nodules containing nitrogen fixing bacteria
23. The total amount of living material in an organism
24. A smaller representative part of the population
25. What must nitrogen be converted to before plants can use it?
27. The sampling square used to compare species and % cover between habitats

1. What is nitrogen used to make in animals and plants?
3. Producers are special because they can convert light energy to ...... energy (glucose)
5. Feeding and ...... pass carbon atoms in organic compounds along food chains
9. ...... fixes carbon dioxide into organic compounds
14. Plants which photosynthesise to produce food
16. Animals that eat plants or animals
17. The different stages in a food chain are called ....... levels
18. One process that results in energy loss between trophic levels
19. Nitrogen fixing bacteria can be found in root ......
21. Pyramids of ........ represent the number or organisms at each trophic level
26. A natural type of nitrogen fertiliser used by farmers
28. Example of an aquatic producer