Changes in Ecosystems

What is the major difference between primary and secondary succession?

• secondary succession involves bare rock

• primary succession involves soil to start from

• Primary succession starts from bare rock

• none of these are correct

Hurricanes, floods forest fires all result in destroyed ecosystems with soil that is intact. What type of succession is this?

• primary succession

• secondary succession

• tertiary succession

• quaternary succession

Which of the below is a biotic factor?

• water

• soil

• bacteria

• gasses

Tags

NGSS.MS-LS2-4

Which of the following is an abiotic factor?

• bacteria

• oak trees

• soil

• insects

Tags

NGSS.MS-LS2-3

Which situation below shows a correct interaction between an abiotic and biotic factor?

• a rock at the bottom river gets carried by the current downstream

• bacteria in soil breaks down decomposing animals

• wind blows sand from a sand dune

• waves crash against rocks at a beach

Which situation below demonstrates abiotic and biotic factor interacting?

• sunlight causing plants undergo photosynthesis

• tiger hiding in grass to stalk a buffalo

• fish swimming through corals to get protection from predators

• birds landing on elephants backs to pick off insects

This is a lichen which is the type of species that will live on bare rocks. What are these species called?

• intermediate species

• unnatural species

• pioneer species

• exploratory species

Tags

NGSS.MS-LS2-4

This is the ecosystem 137 years after a devastating forest fire, what type of community is this known as?

• primary community

• secondary community

• hostile community

• climax community

Tags

NGSS.MS-LS2-4

What is salinity?

• amount of chemicals in water

• amount of salt in water

• amount of deuterium in water

• amount of sugar

Freshwater refers to water that has little to no salinity. This refers to what chemical?

• sugar

• chlorine

• salt

• oxygen