Unit 6 Ecology

What is it called when a group of the same organisms living together in the same place at the same time?

• An organism
• A population
• A community
• A biome

The diagram below shows the cycling of nutrients in an ecosystem.
The removal of which of the following groups would cause an immediate decrease in the amount of energy flowing through the system?

• Producers
• Consumers
• Decomposers
• Inorganic nutrients

What is the original source of almost all energy in most ecosystems?

• carbohydrates
• sunlight
• water
• carbon

Series of steps in which organisms transfer energy by eating and being eaten

• foodweb
• consumer
• food chain
• omnivore

The diagram shows the forest environment and several organisms that live there. If rainfall in the area is less than expected, what is most likely result on the ecosystem?

• More deer and rabbit will migrate into the area

• Water will become a limiting factor for all organisms

• The birth rate will increase for the rabbit and bird population

• The organisms will adapt in order to survive

Some pine roots have been associated with Mycorrhizal fungi. The fungi absorb water and minerals, pass them to the plant, and receive carbohydrates in return. What type of relationship exist between the 2 organisms?

• competition

• cooperation

• mutualism

• paratism

A gazelle is a natural prey of a cheetah. What happens to the population of gazelles when the population of the cheetahs decrease?

• The population of the gazelles decreases.

• The population of the gazelles increases.

• The population of the gazelles stay the same.

• The population of the gazelles is not related to the population of the cheetahs.

Which term describes the condition or resources that keep the population at a certain size?

• abiotic factor

• balance factor

• biotic factor

• limiting factor

Which of the following interactions is an example of symbiosis?

• an insect acts as a pollinator for a plant species
• a population of hummingbirds migrates during the summer
• a tropical bird performs a courtship dance for a mate
• a mother bear feeds and protects her cubs

The graph below shows population data for two species.  What can be said about the relationship between species 1 and species 2?

• When the population of species 1 increases, the population of species 2 decreases.
• The population of species 1 and species 2 stay the same over the time period shown.
• The population of species 1 is not influenced by the population of species 2.
• When the population of species 1 increases, the population of species 2 increases.