The series of predictable changes that occur in a community over time is called....
Succession
100
A series of changes that occur in an area where the ecosystem has been disturbed, but where soil and organisms still exist is called...
Secondary succession
100
What are the three energy roles of organisms in the ecosystem?
Producer
Consumer
Decomposer
100
This is a series of events in which one organism eats another organism and obtains energy.
A food chain
100
A food web consists of many overlapping ___________ in an ecosystem.
Food chains
200
Primary succession is a series of changes where no ________ or _____________ exist.
Soil or organisms
200
What are two natural events that can cause secondary succession?
Forest fires and hurricanes
200
An organism that can make its own food is a....
Producer
200
______are the source of all food in an ecosystem.
The producers.
200
What form the base of the food web.
Producers - autotrophs
300
Changes the occur on an island formed by a volcano is an example of.....
Primary succession
300
Explain the changes that occur in the community after a forest fire.
The grass and trees are scorched. Over time the grass and trees grow back.
300
Members of an ecosystem that cannot make their own food.... They must EAT to survive.
Consumers
Consume=to take in
300
Consumers are classified by what they....
Eat
300
This diagram shows the amount of energy that moves from one feeding LEVEL to another LEVEL.
The energy pyramid
400
Define pioneer species and give an example of them.
They are there first species to grow. Examples include moss and lichens.
400
Which occurs more rapidly. Primary succession or secondary succession?
Secondary succession because the soil and organisms (producers, decomposes) already exist.
400
What are the three types of consumers and what do they eat?
Herbivores = plants
Omnivores= both plants and meat
Carnivores=meat
400
The arrows in the food chain represent the movement of...
Energy
400
The most energy is available at the ______ level of the pyramid.
Producer
500
Define primary succession.
Changes that occur in an area where no soil or organisms exist.
500
How do primary and secondary succession differ?
Secondary succession occurs in a place where an ecosystem currently exists.
500
Decomposers break down waste and other dead organisms and return the raw materials to the ecosystem. Why are decomposers important members of the ecosystem?
If we did not have decomposers, dead trees and animals would be everywhere. Also they return nutrients into the soil where more plants can grow.
500
Organize two food chains from these organisms
Grass, Plankton, Rabbit, Big fish,
Human, Fox, Small fish, Algae
Grass, rabbit, fox.
Algae, plankton, small fish, big fish, human.
500
The energy increases or decreases as you move up the feeding levels?
Decreases. Only 10% of the energy at one level is transferred to the next level.