Ecosystem Populations

An invasive species is....

• a positive change in an ecosystem

• a species that can take over in an ecosystem

• abiotic and biotic

• a predator in an ecosystem

Tags

NGSS.MS-LS2-2

NGSS.MS-LS2-4

NGSS.MS-LS2-5

What is an introduced species?

• a native species

• a predator at the top of the food chain

• a species brought into an ecosystem

• an organism that eats detritus

If an ecosystem is in danger, it is good to have...

• a variety of species to help it bounce back

• more predators than producers

• more insects to reproduce

• a river or a body of water nearby

Tags

NGSS.MS-LS2-4

NGSS.MS-LS2-5

What types of things are in an ecosystem?

• abiotic things only

• living things only

• invasive species only

• biotic and abiotic things

Tags

NGSS.MS-LS2-3

What is true about a population that has reached its carrying capacity?

• it has reached the largest size that can be sustained by available resources

• it begins to grow as resources become available

• it decreases dramatically as resources are removed

• its size is no longer dependent on the amount of resources present

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

When organisms move out of the population, this is known as

• emigration

• abandonment

• immigration

• succession

The size of a population compared to the amount of space available is called the _________________.

• biotic potential

• population density

• limiting factor

• carrying capacity

Which explanation BEST describes why your answer defines a population?

• They are all the populations of the different species in a particular

  area.

• They are a group of interacting organisms of the same species located

  in the same area.

• They are a system that contains all the biotic and abiotic factors in an

  area

• They are a group of organisms with similar characteristics that are able

  to reproduce with each other to produce offspring.

If the population size stays stable, does this mean that no organisms have been born or died?

• Yes, because if organisms were born or died that would change the number of organisms in the population.

• No, because if some organisms are born and the same number of organisms die, then the total population size can stay constant.

• Yes, because some organisms never die, so they don't need to reproduce.

• No, because all organisms will give birth and then die.

If the number of births is greater than the number of deaths in a population, what will happen to the growth of the population?

• It will increase.

• It will decrease.

• It will stay the same.

• It will fluctuate.

Tags

NGSS.MS-LS2-4