Brainpop Ecosystems

Which of the following might be found in a freshwater ecosystem?

• Water-dwelling bacteria

• Interactions among fish

• Rocks and shells

• All of the above

Where does the energy in most ecosystems originate?

• Sunlight

• Producers

• Water

• Air

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

A habitat is:

• Interactions between species

• Resources in an ecosystem

• Where a species lives

• Nonliving things

The relationships a population has with others in its community are:

• Always harmful

• Always beneficial

• Neither harmful nor beneficial

• Sometimes harmful and sometimes beneficial

Tags

NGSS.MS-LS2-2

Largest number of individuals of a population that the environment can support...  

• carrying capacity

• population crash

• lag phase

• mutualism

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.

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

A part of the environment that keeps a population's size at a level below its full potential is called a _________________ .

• cooperation

• limiting factor

• competition

• carrying capacity

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

• emigration

• abandonment

• immigration

• succession

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.