Changes in Ecosystems-Unit 3, Lesson 3

Flies, worms and ants eat dead plants and animals. They are called:

• producers.

• consumers.

• decomposers.

• carnivores.

What is Biodiversity?

• The number of plants throughout the world

• The number of different animals existing

• The number of different species in an area

• None of the above

What is the order of succession shown in this figure?

• A, B, C, D

• B, A, D, C

• C, D, A, B

• D, A, B, C

What is the name given to lichen or moss during primary succession?

• pioneer species

• volunteer species

• founder species

• secondary species

The gradual development or replacement of one ecological community by another is called?

• succession

• biodiversity

• eutrophication

• pioneer species

What type of succession occurs in an area with no soil?

• ecological succession

• primary succession

• secondary succession

• pioneer species

What is the most important function of pioneer species?

• To create rocks
• To create soil and add nutrients to the environment 
• To look nice
• Food for animals 

What type of succession occurs in an area where soil is already present?

• ecological succession

• primary succession

• secondary succession

• pioneer species

What type of succession occurs after a forest fire?

• primary succession

• secondary succession

• both types

Natural disasters such as flooding and tornadoes are linked to ________________ succession.

• primary

• secondary

• low areas

• ecosystem