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This is a revision exercise to see how well you know your work on this section of the course.

This is a revision exercise to see how well you know your work on this section of the course. You will be presented with a question on the screen. You have to think of the answer or write the answer down on paper. Then you must click the mouse button

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This is a revision exercise to see how well you know your work on this section of the course.

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  1. This is a revision exercise to see how well you know your work on this section of the course. • You will be presented with a question on the screen. • You have to think of the answer or write the answer down on paper. • Then you must click the mouse button • You will then see the correct answer appear on the screen. • Press the mouse again for the next question to appear. once only Now click the mouse to start the questions.

  2. Revision Questions for section (b) How it Works

  3. 1. Give the definition of the term ‘HABITAT’ Answer: The area where an animal or plant lives.

  4. What term is given to describe all the organisms in a pond? 2. Answer: Community.

  5. What is the meaning of the term ‘POPULATION’? 3. Answer: All the organisms of one kind which live in an area.

  6. What term means the community of organisms together with their habitat? 4. Answer: ECOSYSTEM

  7. What 3 parts are present in all ecosystems? 5. Answer: • Population • Community • Habitat

  8. What name is given to green plants which make their food by photosynthesis? 6. Answer: Producers

  9. What is a consumer? 7. Answer: An organism which obtains its food by feeding on other organisms.

  10. Consumers can be divided into 3 groups: 8. A consumer that feeds on plants a) What is a herbivore? A consumer that feeds on animals b) What is a carnivore? A consumer that feeds on plants and animals c) What is an omnivore?

  11. What do the arrows in a food chain represent? 9. Answer: The direction of the flow of energy.

  12. THRUSH 10. LEAVES SNAIL Using the organisms above, state which is the primary consumer? Answer: The snail

  13. What name is given to many food chains which interconnect? 11. Answer: A FOOD WEB

  14. Herring Mackerel 12. Shrimps Animal Plankton Blue whale Plant Plankton What will happen to the number of herring and mackerel if fishermen catch large numbers of shrimps? Answer: The numbers will decrease.

  15. 13. What happens to the size and number of organisms as you move along the food chain? … The size increases Size ? … The numbers decrease. Number?

  16. What is the meaning of the term ‘Pyramid of Biomass’? 14. Answer: The mass of all the organisms at each level in the food chain.

  17. How can energy can be lost in a food chain? 15. Answer: • Movement • Waste • Heat production

  18. How much energy is passed on through each link in a food chain? 16. Answer: 10%

  19. Suggestreasons for the human population explosion. 17. Answer: • Greater medical knowledge • More food available

  20. What factors could limit the growth of a population? 18. Answer: • lack of space • lack of food • disease • predators

  21. 19. Name the group of organisms which help to release chemical elements from dead bodies. Answer: Decomposers

  22. 20. Name 2 important elements recycled by decomposers. Answer: • Nitrogen • Carbon

  23. Dead organisms and waste 21. From the diagram, state where the nitrates in the soil come from. Ammonia Answer: Nitrite The dead organisms and waste Nitrate

  24. Dead organisms and waste 22. What type of decomposer is mainly responsible for the changes shown in the diagram? Ammonia Nitrite Answer: Bacteria. Nitrate

  25. Dead organisms and waste 23. What happens during ‘nitrification’? Ammonia Answer: Nitrite Bacteria convert ammonia into nitrates. Nitrate

  26. 24. What is meant by the term ’denitrification’? Answer: Bacteria convert nitrates into nitrogen gas.

  27. 25. How could you naturally increase the nitrate level of the soil? Answer: Plant clover or add manure.

  28. 26. How could you artificially increase the nitrate level of the soil? Answer: Add fertiliser

  29. This is the end of the questions on sub-topic (b) These revision questions will automatically run again. If you want to return to the list of revision topics click on the back browser on your toolbar.

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