Populations in Ecosystems

Which statement BEST explains the flow of energy as it moves through the different levels?

• Energy decreases as it is lost as heat to the environment.

• Energy increases as it is gained from the environment.

• Energy is unavailable because it is used up by the organisms at Level 1.

• Energy is transferred as it is produced by organisms in the next level.

Tags

NGSS.MS-LS2-3

Changes to abiotic factors in an environment can impact biotic factors. Which statement is the BEST example of this situation?

• Heavy rainfall increases soil erosion.

• Melting glaciers cause sea levels to rise.

• Cold temperatures cause rocks to weather.

• Drought conditions increase competition among consumers.

Tags

NGSS.MS-LS2-4

A pride of lions stalks, tackles, and kills an antelope. Which is best being demonstrated?

• predation

• mutualism

• cooperation

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NGSS.MS-LS2-2

NGSS.MS-LS2-4

Which best describes mutualism?

• Ticks live and feed on dogs and other animals’ blood to survive.

• Mushrooms send out long, underground structures which allow them to grow in other areas.

• Ants attack animals that try to feed on the acacia tree, and the ants feed on the nectar of the tree.

Tags

NGSS.MS-LS2-2

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.

Tags

NGSS.MS-LS4-4

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

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

• carrying capacity

• population crash

• lag phase

• mutualism

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

• biotic potential

• population density

• limiting factor

• carrying capacity

If the number of births in a population is the same as 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.

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.