Ecology Test

Secondary Succession on land always begin when _______ is still available.

• Rock

• Dirt

• Water

• Wind

the first organisms that appear in an ecological community

• ecological succession 
• primary succession 
• secondary succession
• pioneer speciles

Invasive species alter the ecosystem by ______ in number quickly. This leads to ______ food for the native species.

• increasing, less

• increasing, more

• decreasing, less

• decreasing, more

Why has the world population dramatically increased?

• Better medicine

• Better sanitation

• Better technology

• All of the above

The population pyramid shown is most likely which country?

• developed country

• non developed country

 When an environment has reached its carrying capacity for a certain population, which of the following is true? 

•  Growth and immigration rate is equal to death and emigration rate. 
•  Growth and immigration rate is greater than death and emigration rate. 
• Growth and immigration rate is less than death and emigration rate. 
• Growth rate is exponential. 

Define ecology

• is the study of how organisms interact with one another

• is the study of how organisms interact with one another and with their physical environment.

• is the study of how organisms interact with one another and with their chemical environment.

• is the study of how organisms interact with one another and with their bodies.

How much energy is available to be passed on to the next trophic level in an ecosystem?

• 100%
• 10%
• 50%
• 75%

The source of energy that supports all food webs on Earth is the _______________________________.

• sun.

• producers.

• Earth's core.

• primary consumers.

Symbiotic relationship where one species benefits and the other isn't helped or hurt.

• Mutualism
• Commensalism
• Parasitism
• Predation