Name: _______________________ Block: ______ Date: _______________ HB6.1. Worksheet: Populations and the Environment 1 to 5: Identify whether each of the following is a biotic or abiotic factor. __________ 1. Bear __________ 2. Rock __________ 3. Dead log __________ 4. Grass __________ 5. Sunlight 6. An organism’s niche is determined by its _______________, which is it’s physical environment. 7. ________________, inherited traits that increase an organisms chance of survival, also determine an organism’s niche. 8. Which of the following statements are observations about the photo on the right? Check all that apply. A. Three boys are wearing green shirts. B. Most of the children are running. C. The boy in yellow is going to kick the ball. D. The grass is green. E. The boy on the far right is playing defense. 9 to 13: Identify the interactions as positive, negative, or both. 9. A mudslide wipes out the side of a thriving hill. _______________ 10. A volcano erupts, covering the nearby land with lava. _______________ 11. A forest is rapidly growing new plant life. _______________ 12. Humans remove wolves from a national park to protect surrounding homes. _______________ 13. A dam is built in the middle of a river ecosystem to supply water to a nearby town. _______________ 14. A recent forest fire has swept through the forest, killing many of the smaller organisms such as the hare, deer, and rodent populations that are prey for the larger organisms such as bobcats, wolves, and mountain lions. How would this affect the populations in the forest ecosystem? Check all that apply. A. The populations of all organisms in the forest will stay the same. B. The populations of bobcats, wolves, and mountain lions will decrease due to lack of food. C. The populations of deer, hare, and rodents will decrease due to the number of predators. D. The population of bobcats, wolves, and mountain lions will increase due to the availability of food. 15 to 19: Identify the following as biotic or abiotic. __________ 15. Heat __________ 16. Insects __________ 17. Rotting log __________ 18. Bacteria __________ 19. Water Read the following to explore the habitat as well as the niche of a giraffe, then answer the questions provided. 20. Describe the habitat of the giraffe. 21. Describe the niche of the giraffe. Read the following article about the tundra biome, then answer the question provided. 22. Describe animal interactions that affect populations in the tundra ecosystem.