Ecology Review

Which ecosystem has a great chance of surviving when environmental conditions change over a long period of time?

• one with a lot of diversity
• one with only plants and animals
• one with only animals
• one with no diversity

Which biotic factor would limit a deer population?

• predators
• drought
• no oxygen
• snow

A farmer abandons his field and it later becomes replaced by another community.  This is-

• primary succession
• secondary succession
• energy pyramid

Which trophic level has the most energy available?

• producers
• primary consumers
• secondary consumers
• tertiary consumers

Which relationship is mutualistic?

• aphids feeding on ants
• nitrogen fixing bacteria in root nodules of legumes
• infectious bacteria living in the blood of a host
• wolves and arctic fox feeding on snowshoe rabbits

Fishing causes overgrowth of algae because-

• it allows more sunlight to be available to the algae
• doesn't allow the spread of disease
• reduces the number of organisms that feed on algae
• increases competition between algae

What do the carbon and nitrogen cycles ensure (allow)?

• human activities have no effect
• living organisms will not become limited to one nutrient
• nutrients will be circulated throughout the biosphere
• nutrients will not reach toxic levels

What should a student add to remove nitrates?

• fish
• plants
• nitrobacter
• water

What happens to the rest of the energy that doesn't move up to the next trophic level?

• it's released as heat
• it becomes nutrients for soil
• it becomes food
• it becomes less space

What possibly caused the change in the ecosystem?

• volcano
• flood
• small tornado
• migration of insects