Unit 6 Changes in Ecosystems

Which abiotic factors define deserts?

• many cacti and few grasses

• often hot and very humid

• often hot and very dry

• many grasses few trees

What is the MOST likely effect of cutting down a large area of trees?

• decrease in soil erosion

• loss of habitat for animals

• lower pollution levels

• increase in oxygen in the air

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Based on the data which conclusion can be made?

• Aphid population numbers are related to seasonal temperature changes.

• Most of the aphids migrate to another place in the winter.

• Peak aphid population numbers occur in September.

• The population of aphids depends upon populations of predators.

Tags

NGSS.MS-LS2-1

What is a main biotic factor in a coniferous forest?

• many grasses and few trees.

• trees that lose their leaves to save water.

• seasonal rains.

• trees that do not change much seasonally.

Fur of Arctic foxes and Arctic hares is white in winter. Both species fur turn brown in the summer. This adaptation helps camouflage these animals. Which biome would this predator-prey relationship of Arctic Foxes and Arctic hares be found?

• wetland

• rain forest

• tundra

• desert

Tags

NGSS.MS-LS4-4

This biome has seasonal rains which require large herds of herbivores to migrate great distances to search for water. Which biome is being described?

• savanna

• desert

• Arctic tundra

• tropical rainforest

Tags

NGSS.MS-LS2-1

Fishing has removed most of the adult bass from the wetland community. Based on the data from the chart, what would MOST likely occur?

• Snails would need to find another food source.

• Young bass would migrate to other areas.

• Sunfish would become overpopulated.

• Minnows would have more difficulty reproducing.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

NGSS.MS-LS2-2

What would be a true comparison of an ecosystems.

• Rain forests are rockier than tundras.

• Tundras are warmer than grasslands.

• Deserts have more plants than rain forests.

• Grasslands get more rain than deserts.

Humans MOST commonly contribute to the extinction of organisms by

• destruction of habitat

• use of fertilizers

• rotation of crops

• introduction of competing species.

Tags

NGSS.MS-LS2-4

In the graph, what is occurring at Point A?

• There are more than enough resources for the population.

• There are not enough resources for the population.

• There are just enough resources for the population.

• There are no resources available for the population.

Tags

NGSS.MS-ESS3-4