Ecology Review 1

Humans have an effect on ecosystems when they use native grasslands or forested areas for farming or urban use. One negative effect of these changes on the ecosystem is that there will be

• Less biodiversity

• More homes

• Successful economic growth

• Increased food production

Based on this information, which ecosystem is likely to be the most stable?

• A

• B

• C

• D

The organisms represented by X are

• Decomposes

• Producers

• Carnivores

• Scavengers

What may happen if the snowshoe hare was removed from the food web pictured?

• The insects in the habitat would increase.
• The shrew population would decrease due to being only hawk food source.
• The willow tree population would decrease.
• Foxes would dies due to no food source. 

Which one of the animals is the top of the food chain?

• Lion

• Tree

• Mouse

• Snake

What is a main difference between primary ecological succession and secondary ecological succession?

• Primary succession happens after a disaster

• Secondary succession starts with large plants

• Secondary succession happens after a disaster

• Only primary succession starts with small grasses

What would happen within a few months after the formation of a volcanic island?

• pioneer species would grow

• no pioneer species would grow

• trees and large plants would grow

• rich, organic soil would be present

The energy for use in trophic level A originally comes from where?

• Decomposers

• The Sun

• Trophic level B

• Trophic level A

The section of the graph labeled A represents what?

• Human interactions

• A natural disaster

• Predatory/prey interactions

• A population at equilibrium

Which contribute to a positive population growth?

• immigration

• positive birth rate

• emigration

• positive death rate