Practice Test - Combined Sciences 8

Name: _____________________________________ Grade/Section: ________ Date: ___________ 1. Describe the meaning of the terms community, environment, population and ecosystem..........................................................

Name: _____________________________________ Grade/Section: ________ Date: ___________ 1. Describe the meaning of the terms community, environment, population and ecosystem.................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 2. Some students were investigating the biodiversity of plants in a salt marsh. State the meaning of the term ‘biodiversity’.................................................................................................................................................................................................................................................................................................................. 3. Today, humans are cutting down large areas of tropical rainforests. Suggest one use of the land after the trees have been removed................................................................................................................................................................................................................................................................................................................... 4. Why does the removal of trees cause an increase in carbon dioxide in the atmosphere? Choose two answers from the below options. OPTIONS: There are fewer animals There is less photosynthesis There is less respiration The soil dries out The tress are burned.................................................................................................................................................................................................................................................................................................................. 1 5. What effect would an increase in carbon dioxide in the atmosphere have on global air temperature? Tick one box. Decrease Increase Stay the same 6. What is a trophic level?.................................................................................................................................................................................................................................................................................................................. 7. Give the role of these species to the ecosystem and give one example: Species Role in the ecosystem Example plants or autotroph animals or heterotroph decomposer prey predator 8. Construct a food chain using these organisms. You may look into the internet on see what these species look like. Algae Daphnia Hydra Dragonfly nymp 9. i. What is a biomass? ii. Compare the biomass of Daphnia and algae.............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. 2  10. What are the sources of carbon? How does it contribute to the increase in Earth’s temperature?................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 11. Write the equation of photosynthesis and respiration in the space below. Part 2. Reading These links are about Ramsar convention. Read this link. These could help you answer questions for your criterion A test. You may also read other articles about wetland conservation. Home page | The Convention on Wetlands, The Convention on Wetlands (ramsar.org) Convention on Wetlands of International Importance especially as Waterfowl Habitat | UNESCO 12. Why is it important to conserve wetland ecosystems?................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 3 Part 3: Criterion B and C components and skills. Reminder to review your Prelab and postlab components. such as Variables, hypothesis, data collection , graph and data interpretation 4