Unit 2.3 Review

The tundra biome is characterized by:

• Coniferous trees

• Sand and Cacti

• Vast areas of Grass

• Permafrost

“It is usually hot during the summer in Texas” describes:

• Weather

• Climate

• Precipitation

An animal that helps maintain a habitat and is vital to the ecosystem’s health is considered a(n):

• Indicator species

• Keystone species

• Pioneer species

Frogs are very sensitive to air and water quality due to the fact that they absorb both oxygen and toxins through their skin. This makes them an excellent:

• Keystone species

• Pioneer species

• Indicator species

True or False? Mangrove tree roots cause erosion.

• True

• False

Secondary succession starts with:

• The growth of lichens on newly formed rock

• Vegetation growing after a forest fire

• Moss growing after glaciers retreat

True or False? Soil is present at the beginning of secondary succession.

• True

• False

An oak tree forest is an example of:

• Climax community

• Pioneer species

• Intermediate species

A non-native organism, such as the lionfish, can be introduced into a thriving ecosystem and begin to take over. This is known as a:

• Pioneer species

• Keystone species

• Invasive species

• Indicator species

What do the arrows in a food web represent?

• The flow of energy from one organism to another

• The trophic level of a certain species

• Which prey is being eaten by a specific predator