1. Basketball 8 th Grade Science Mr. Olsen

2. RoseGrassHawkSnake MushroomAntelopeCougarFrog Maple TreeBacteriaAspen TreeWorms Which organisms are consumers?

3. 1.Suppose rural farmers in your community are having problems with wolves killing their sheep. The wolves normally eat rabbits, and rabbits eat wild grasses and shrubs. When there aren’t enough rabbits, wolves move closer to ranches and take sheep. Which of these is the best hypothesis for finding a solution to this problem? Explain your reasoning. a.if the wolf population were increased, then the number of rabbits would decrease b.if there were more sheep, then the wolf kills would increase c.if there were fewer rabbits, then there would be fewer wolves around d.if there were more rabbit food, then there would be more rabbits

4. Elodea is an underwater plant. A Goodly sample of Elodea is placed under a graduated glass beaker under a bright light. The glass beaker is balanced even on 3 identical rocks so it is off the floor of the tank. See the diagram. 1.What would you expect to see after 20 minutes? a. a gas will collect in the beaker b. the Elodea will shrivel c. bubbles will come out of the beaker d. the Elodea will turn a darker green

5. RoseGrassHawkSnake MushroomAntelopeCougarFrog Maple TreeBacteriaAspen TreeWorms Which organisms are producers?

6. 1)Which substances are the products of photosynthesis? a. carbon dioxide and oxygen b. carbon dioxide and water c. glucose (sugar) and oxygen d. glucose (sugar) and water

7. 1. Which level of the food pyramid contains the most energy? a. A b. B c. C d. D 2. In what main form is energy lost as you move up the pyramid? a. light energy b. chemical energy c. heat energy d. nuclear energy

8. Many scientists believe Earth’s early atmosphere had no oxygen. Humans need oxygen to survive. According to some theories plants had to photosynthesize before humans could live on Earth. What evidence backs up this statement? a. Humans cannot survive without water. b. Doctors tell us both plants and humans need sunlight. c. Plants use carbon dioxide and water to photosynthesis. d. Plants give off oxygen during photosynthesis.

9. Elodea is an underwater plant. A goodly sample of Elodea is placed under a graduated glass beaker under a bright light. The glass beaker is balanced even on 3 identical rocks so it is off the floor of the tank. See the diagram. 2. Why was the beaker raised up on rocks? a. to make the Elodea closer to the light b. so you could better see what happened c. to make sure the Elodea did not touch to tank bottom d. so water could escape from the beaker

10. Gina was trying to model the flow of energy through an ocean ecosystem by using the pond behind their house. She observed fish, algae, water plants, frogs, aquatic insects, and various microorganisms living in the pond. She wants to order the organisms of her pond by how energy flows through them. Which would be the most correct ordering? a. water plants → frogs → insects → fish b. algae → microorganisms → insects → fish c. fish → water plants → frogs → microorganisms d. algae → fish → frogs → microorganisms

11. YearRabbitsLynx 19981003 19991803 20002004 20012256 2002806 2003602 20041202 20052003 20061905 Graph the following data and use your graphs to answer the following questions. 1)How many rabbits can the habitat support? 2)List three factors that could have caused the changes in rabbit population. 3)What relationship exists between the rabbit and the lynx? 4)Predict how the introduction of sheep into this habitat would influence the rabbit population. Justify your predictions.

12. → → → What is missing in the above model of a food chain? a. a mouse because an owl eats it b. a tree because it is larger than the plant shown c. a deer because it eats the grass d. a hawk because it is a consumer

13. Key: a. Problem (stated or implied) b. Hypothesis (possible solution to the problem) c. Statement of initial observations. d. Observation based on the experiment (1) During some years when the annual rainfall was only 1.5 inches, the desert floor in Death Valley bloomed with a carpet of color. (2) How can seeds measure the rainfall in Death Valley? (3)In the laboratory, if seed-containing desert soil is spread on pure sand and wet with a sprinkler, the seeds will not germinate until the equivalent of one inch of rain has fallen on them. (4) What factor(s) assure the germination of these desert plants?

14. In a closed terrarium, more photosynthesis is taking place than respiration. Which gas would you expect to increase? a. Air b. Carbon dioxide c. Oxygen d. Nitrogen

15. Study the list below. Which sequence best shows the path of energy that allows animals to move? Explain your reasoning. a. photosynthesis --> light energy --> mechanical energy --> respiration b. mechanical energy --> light energy --> photosynthesis --> respiration c. light energy --> photosynthesis --> respiration --> mechanical energy d. respiration --> light energy --> photosynthesis --> mechanical energy

16. RoseGrassHawkSnake MushroomAntelopeCougarFrog Maple TreeBacteriaAspen TreeWorms Which organisms are decomposers?

17. Create a different food chain for 3 food items that you consumed yesterday.

18. Explain how different types of energy get converted and passed through the food chain.