Biology Homework #30
1. Define: population density. A measurement of population per unit area or unit volume.
2. What three factors affect population density? The Climate of the Area, Mineral Resources, Births and deaths.
3. What causes a population to slow or stop? Death or poverty.
4. What is the carrying capacity of an environment? The maximum population size of the species that the environment can sustain.
5. What is a limiting factor? a factor that controls a process, such as organism growth or species population or size.
6. When populations become crowded, what do organisms compete for? Space and supplies.
7. What is a predator-prey relationship? The interaction between a species that eats predator another species prey.
8. How do parasites limit population growth? They take nourishment from their hosts, often weakening them and causing disease or death.

9. What is a renewable resource? Any natural resource that can be replenished naturally with the passage of time.
10. What is a nonrenewable resource? A natural resource which cannot be produced, grown, generated, or used ever again.
11. What occurs during soil erosion? Rainfall and runoff displace soil particles from inadequately protected surfaces.

12. Define: desertification. Process by which fertile land becomes desert, typically as a result of drought or deforestation.
13. Define: deforestation. Taking down of trees.
14. Define: pollutant. Waste matter that contaminates the water or air or soil.
15. What is biodiversity? The variety of life in the world or in a particular habitat or ecosystem.
16. What is the difference between species and genetic diversity? Genetic diversity deals with the number of genetic differences contained in a given species.
17. When does extinction occur? Extinction happens when an endangered species is completely wiped out by human activity or natural disaster.
18. What is an endangered species? A species whose numbers are so small that the species is at risk of extinction.
19. How does demand for wildlife products lead to endangered species? We need meds some wildlife supplies us with it therefore we cn cause a species to be endangered.
20. What happens during biological magnification? Explains why a substance appears in higher concentrations in organisms higher in a given food chain than in organisms lower in a food chain.
21. Define: invasive species Can be plants, animals, and other organisms.
22. Why is conservation important? Because we need animals for food and survival of humans.
23. List three effects of global warming. Cars, deforestation and factories. |