Review 7th 4th 4 Weeks

A glacier cuts into a mountain and leaves bare rocks. Lichens begin to live on the rocks. The lichens produce an acid that starts to break down the rocks. What effect will this have on the enviroment?

• It will put acid into the lakes and ponds.

• It will begin the process of making soil.

• It will prevent the carbon cycle from occurring

• It will prevent bacteria from invading the ecosystem.

Why is it difficult to create a terrarium ecosystem that will last a long time without human help?

• Terrarium ecosystems cannot get enough sunlight.

• Terrarium ecosystems cannot get enough water.

• Ecosystems with few species are weak and unstable.

• All ecosystems require humans to manage them.

A hurrican hits a coastal prairie and destroys the habitat. Years later, small plants appear that have rapidly spreading roots.

This vegetation describes:

• biodiversity

• secondary succession

• primary succession

• a microhabitat

Which of the following sequences most likely represents ecological succession a recently abandoned wheat field?

• native trees>shrubs>flowering plants>grasses

• shrubs>grasses>native trees>flowering plants

• flowering plants>native trees>shrubs.grasses

• grasses>flowering plants>shrubs>native trees

The role of a pioneer species in primary succession is to change a bare habitat into one that is suitable for other ecosystems. A species that is responsible for primary succession in an ecosystem is most likely able to -

• live at high altitudes

• carry out photosynthesis

• migrate during winter

• survive any predator

What is the relationship between ecological succession and equilibrium in an ecosystem?

• Ecological succession leads to equilibrium in an ecosystem.

• Ecological successin prevents ecosystems from ever reaching equilibrium.

• There is no relationship between ecological succession and equilibrium.

• Ecological succession and equilibrium are the same thing.

Deer provide food for wolves. How does this relationship also benefit the herd of deer?

• by protecting the deer from disease

• by decreasing diversity within the herd

• by controlling the deer population

• by protecting deer from other predators

When do mutations help make an ecosystem more sustainable?

• when mutations decrease the number of individuals in an ecosystem

• when mutations increase the number of individuals in an ecosystem

• when mutations decrease the number of species in an ecosystem

• when mutations increase the number of species in an ecosystem

Which of the following situations contributes to the sustainability of an ecosystem?

• Increase in biodiversity

• Decrease in biodiversity

• Extinction of a population from the ecosystem

• Removal of many populations of organisms

The relationship between ALL the organisms in a community showing who eats whom is called a ___________________________.

• Food Web
• Food Chain
• Abiotic Factors
• Biotic Factors