W. McConnell 2004 Kinross High School 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.

W. McConnell 2004 Kinross High School Revision Questions for section (b) How it Works

W. McConnell 2004 Kinross High School 1. Give the definition of the term ‘HABITAT’ Answer: The area where an animal or plant lives.

W. McConnell 2004 Kinross High School 2. What term is given to describe all the organisms in a pond? Answer: Community.

W. McConnell 2004 Kinross High School 3. What is the meaning of the term ‘POPULATION’? Answer: All the organisms of one kind which live in an area.

W. McConnell 2004 Kinross High School 4. What term means the community of organisms together with their habitat? Answer: ECOSYSTEM

W. McConnell 2004 Kinross High School 5. What 3 parts are present in all ecosystems? Answer: Population Community Habitat

W. McConnell 2004 Kinross High School 6. What name is given to green plants which make their food by photosynthesis? Answer: Producers

W. McConnell 2004 Kinross High School 7. What is a consumer? Answer: An organism which obtains its food by feeding on other organisms.

W. McConnell 2004 Kinross High School 8. Consumers can be divided into 3 groups: a) What is a herbivore? b) What is a carnivore? c) What is an omnivore? A consumer that feeds on plants A consumer that feeds on animals A consumer that feeds on plants and animals

W. McConnell 2004 Kinross High School 9. What do the arrows in a food chain represent? Answer: The direction of the flow of energy.

W. McConnell 2004 Kinross High School 10. Answer: The snail LEAVES SNAIL THRUSH Using the organisms above, state which is the primary consumer?

W. McConnell 2004 Kinross High School 11. What name is given to many food chains which interconnect? Answer: A FOOD WEB

W. McConnell 2004 Kinross High School 12. Answer : The numbers will decrease. Herring Shrimps Animal Plankton Plant Plankton Blue whale Mackerel What will happen to the number of herring and mackerel if fishermen catch large numbers of shrimps?

W. McConnell 2004 Kinross High School 13. What happens to the size and number of organisms as you move along the food chain? Size ? Number? … … The size increases The numbers decrease.

W. McConnell 2004 Kinross High School 14. What is the meaning of the term ‘Pyramid of Biomass’? Answer: The mass of all the organisms at each level in the food chain.

W. McConnell 2004 Kinross High School 15. How can energy can be lost in a food chain? Answer: Movement Waste Heat production

W. McConnell 2004 Kinross High School 16. How much energy is passed on through each link in a food chain? Answer: 10%

W. McConnell 2004 Kinross High School 17. Suggest reasons for the human population explosion. Answer: Greater medical knowledge More food available

W. McConnell 2004 Kinross High School 18. What factors could limit the growth of a population? Answer: lack of space lack of food disease predators

W. McConnell 2004 Kinross High School 19. Name the group of organisms which help to release chemical elements from dead bodies. Answer: Decomposers

W. McConnell 2004 Kinross High School 20. Name 2 important elements recycled by decomposers. Answer: Nitrogen Carbon

W. McConnell 2004 Kinross High School 21. Dead organisms and waste Ammonia Nitrate Nitrite From the diagram, state where the nitrates in the soil come from. Answer: The dead organisms and waste

W. McConnell 2004 Kinross High School 22. Dead organisms and waste Ammonia Nitrate Nitrite What type of decomposer is mainly responsible for the changes shown in the diagram? Answer: Bacteria.

W. McConnell 2004 Kinross High School 23. Dead organisms and waste Ammonia Nitrate Nitrite What happens during ‘nitrification’? Answer: Bacteria convert ammonia into nitrates.

W. McConnell 2004 Kinross High School 24. What is meant by the term ’denitrification’? Answer: Bacteria convert nitrates into nitrogen gas.

W. McConnell 2004 Kinross High School 25. How could you naturally increase the nitrate level of the soil? Answer: Plant clover or add manure.

W. McConnell 2004 Kinross High School 26. How could you artificially increase the nitrate level of the soil? Answer: Add fertiliser

W. McConnell 2004 Kinross High School 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.