What are the basic needs that are provided in an organism's habitat?
What is food, water, shelter, and other things needed to live, grow, and reproduce.
100
What are two ways an organism can leave and join a population?
Leave - dye and emigration
Join - being born or immigration
100
What are the 3 energy roles that organisms fill in an ecosystem?
Producers, consumers, and decomposers.
100
What are the 3 main ways in which organisms interact with each other?
Predation, Competition, and Symbiosis
100
What are the 3 major processes that occur during the water cycle?
Precipitation, Evaporation, and Condensation
200
What are the nonliving parts of an environment?
Abiotic factors
200
What are the six limiting factors for a population?
Food, water, space, light, soil composition, and weather conditions.
200
How do producers, consumers, and decomposers obtain energy?
Producers - mainly from sunlight
Consumers - from other organisms
Decomposers - by breaking down wastes
200
What is predation?
When an organism kills another for food.
200
Why do organisms need nitrogen?
All organisms need nitrogen because it is a necessary building block in the matter that makes up all living things.
300
What are the levels of organization from smallest to largest?
Organism, population, community, ecosystem
300
Why is water a limiting factor and why does it limit population?
Is a limiting factor being it is in limited supply. All organisms need water to carry out life processes, so population decreases.
300
What is the difference between a food chain and food web?
A food chain is a series of events in which one organism eats the other. A food web consists of many overlapping food chains. So food webs are more realistic.
300
What is competition?
Competition amongst organisms is the struggle to survive as they attempt to use the same limited resource.
300
Which two substances are linked in one recycling process?
Oxygen and Carbon Dioxide
400
Why are sunlight and water the most important abiotic factors?
Sunlight is used for photosynthesis, the process when plants make their food. Water is needed for any living thing to carry out processes.
400
A population of 100 mice have reproduced 600 young. If 200 mice have died, how many mice are in the population now? ( Assuming that no mice have left or joined a population.)
500 mice
400
Why is their less energy at the top of the energy pyramid?
Consumers that are eaten by other organisms use most of their energy to carry out life processes. This means that the organism that eats a consumer will not consume lots of energy, and the organism that eats this organism will have consumed even less energy.
400
For each type of symbolic relationship, explain how the two organisms are affected.
Parasitism - one benefits and the other is harmed when parasite is in or on another organism feeding off of it.
Mutualism - both organisms benefited
Commensalism - one organism is benefited and the other is neither harmed nor benefited.
400
Outline the major steps of the nitrogen cycle.
Nitrogen moves from air to soil, to living things, and back into the air.
500
Why does any change in an area affect all the populations that live there?
The populations in an ecosystem interact with one another.
500
What happens if the death rate of a population is more than the birth rate?
The population will decrease.
500
Why are there few organisms at the top of an energy pyramid?
Less energy passes up the food chain that the top of the food chain animals do not have enough energy to carry out life processes.
500
Which symbolic relationship is occurring when flees are feeding off of a dog's skin?
Parasitism
500
How do primary and secondary succession differ?
Secondary succession takes place where an ecosystem currently exists, and secondary succession occurs rapidly, unlike primary succession.