18.6: Ecosystems- Challenge 1
- Page ID
- 5601
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- 1. Abiotic factors in an ecosystem include ___.
- living space, water, and temperature (this list isn't exhaustive)
- 2. An organism's "job" within its community is its ___.
- niche
- 3. What is the relationship between population, community, and ecosystem?
- A population is all the individuals of a particular species living in a given area. A community includes all the different populations of an area. An ecosystem is the biotic and abiotic factors in which the community lives.
- 4. A tapeworm living in the stomach of a human is an example of ___.
- parasitism
- 5. A plant-pollinator relationship is a ___ relationship.
- mutualistic
- 6. Lichen is a fungus and an algae living together. The algae provides food through photosynthesis, while the fungi retains the moisture that they both need to live. This relationship is an example of ___.
- mutualism
- 7. Food webs are more accurate than food chains because ___.
- many organisms eat at multiple trophic levels
- 8. There is a large number of producers in an ecosystem, but there are much fewer ___ at the highest trophic level.
- consumers
- 9. A ___ depicts the feeding connections in an ecosystem.
- food web
- 10. Broken down rocks and minerals provide ___ in ecosystems.
- nutrients
- 11. Plant cell growth depends on the nutrients ___.
- nitrogen and phosphorus
- 12. Substances that enter a food chain at the bottom and leave at the top are ___.
- nutrients
- 13. ___ cannot use atmospheric nitrogen, so they depend on bacteria in their root nodules to "fix" nitrogen for them.
- Legumes and other plants
- 14. Nitrogen-fixing bacteria convert nitrogen to ___.
- ammonia
- 15. Nitrifying bacteria convert ___ to ___.
- ammonium to nitrites