Population Changes

If a tall tree falls over in a crowded forest, which resource becomes available to the surrounding

plants?

• air

• soil

• water

• sunlight

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Which widespread change in the environment would most severely impact this bird?

Responses

• • slow, gradual warm-up

• • slow, gradual cool-down

• • long period of intense rain

• • long period of extreme drought

Tags

NGSS.MS-LS2-4

Which change in the environment would most likely decrease the ability of this animal to survive?

• • increase in Earth’s temperature

• • decrease in Earth’s temperature

• • increase in yearly rainfall

• decrease in yearly rainfall

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

In ecosystems where people live, which of the following are most likely to cause an increase in diseases transmitted by water?

• • floods

• • hailstorms

• • blizzard

• • avalanches

Tags

NGSS.MS-ESS3-2

Which is an abiotic factor that most limits the number of frogs living in a pond?

• • the color of the water

• • the number of predators

• • the temperature of the water

• the populations of producers

Tags

NGSS.MS-LS1-5

Karina moved into a house in a forest. When she first moved in, Karina would often see red foxes. As new houses were built, fewer and fewer foxes were seen. What is the most likely reason the number of foxes decreased?

• • The fox habitat was destroyed.

• • People kept the foxes as pets.

• • Predators moved into the area.

• • Cutting down trees reduced oxygen.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Pond ecosystems depend on the water cycle to ensure the survival of the animals that live in or near the pond. If a drought reduces the water level, which population of animals would be most affected?

• duck

• fish

• mouse

• snake

Tags

NGSS.MS-ESS2-4

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Coffee beans were once grown on farms with several types of fruit trees. The fruit trees provided shade and shelter to many insects and tropical birds. To produce more coffee beans, the fruit trees were cut down. What is the most likely result of cutting down the fruit trees?

• • a decline in the quality of the coffee beans

• • the development of a new tree species

• • a loss of habitat for the animals

• • the extinction of many tree species

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Nicole was studying different ecosystems. She compared the number of plants living in a forest to those in a desert. Which factor best explains why more plants may survive in a forest?

• • There is more rain in the forest.

• • There is more oxygen in the forest.

• • There is more sunlight in the forest.

• • There is more competition in the forest.

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Koalas are mammals from Australia. Koalas only eat leaves from the eucalyptus tree. These leaves are low in nutrition, so the koalas have to eat a lot of them to get the energy they need. If a population of koalas is unable to find enough eucalyptus leaves to meet their needs, which will most likely happen?

• • The koalas will need less energy.

• • The population of koalas will decrease.

• • The population of eucalyptus trees will increase.

• • The koalas will get nutrition from another source.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4