7th LS Succession and Ecosystem Stability 5.3

Open Ended

How do ecosystems change over time?

Multiple Select

Select all of the ways that populations may SUFFER after a flood.

• animals can drown

• soil erosion removes places for plants to root

• animals lay eggs in water

• decomposers have food in the plants/animals that died in the flood

Multiple Select

Select all of the ways that populations may THRIVE after a flood.

• Animal homes can be destroyed

• sediment in the water affects aquatic animals

• new plants can grow on bare soil

• newly deposited sediment contains nutrients

Draw

Using numbers 1-6, put the pictures in order to show succession after a disturbance.

Multiple Choice

________ is described as the number of different species that live in a community.

• stability

• biodiversity

• succession

• disturbance

Multiple Choice

Ecosystems with ______ biodiversity are _______ stable.

• high/less

• high/more

• low/more

Multiple Choice

Most biodiversity hotspots are found in the __________ land ecosystems because the warm and rainy weather helps to support plant growth, which supports animal populations.

• savanna

• tropical rain forest

• coral reef

• tundra

Multiple Select

This is a food web from Yellowstone. Select all of the populations that DECREASED after the wolves were removed.

• beaver

• elk

• aspen

• willow

• grasses

Multiple Choice

The removal of the wolves _________ biodiversity.

• increased

• decreased

Multiple Choice

The removal of the wolves _________ stability.

• increased

• decreased

Multiple Select

Select all of the ways that humans HARM ecosystems

• habitat destruction

• pollution

• sustainable agriculture

• preserving habitats

Multiple Select

Select all of the ways that humans HELP ecosystems.

• introduced species

• climate change

• reducing pollution

• rebuilding habitats