Unit 10 Practice Quiz

Which would have the greatest impact on energy flow within an ecosystem?

• decreasing available sunlight

• 
  decreasing the number of carnivores

• increasing the amount of minerals

• increasing the number of herbivores

Answer explanation

Sunlight would affect the growth of producers - which primarily use photosynthesis to populate.

In an aquatic food web, which organism would get its energy directly from the Sun?

• algae

• krill

• worms

• zooplankton

Several atmosphere gases help trap and hold in some of the heat from the Sun, helping maintain the Earth's temperature. This is the natural phenomenon called the greenhouse effect. Which gas varies in concentration based on plant and ocean coverage?

• carbon dioxide

• methane

• nitrous oxide

• water

Answer explanation

Excessive increases in these gasses

traps solar radiation in the

atmosphere and warms the earth.

Carbon is an element that is found in all living organisms, so the cycling of carbon through these organisms is essential to sustaining all life. Which process is one way that a living organism is involved in the movement of carbon around the earth?

• combustion

• denitrification

• decomposition

• fermentation

Examine the food web.

Which food chain can be found within this food web?

• grass → grasshopper → robin

• cricket → mouse → robin

• grass → rabbit → deer

• oak tree → deer → chipmunk

A tapeworm is found in a young's man's intestines. The tapeworm feeds from the food ingested by the man and deprives him of nutrients. What relationship does this represent?

• Parasitism
• Competition
• Commensalism
• Mutualism

A coral reef provides shelter and nutrients for unicellular algae, while the algae provide photosynthates used by the coral for growth. What term best describes this relationship?

• Commensalism
• Competition
• Mutualism
• Parasitism

Which is an example of a biotic factor that could affect a population of trout in a stream ecosystem?

• average rainfall of the ecosystem

• dissolved oxygen in the stream

• predators in the ecosystem

• types of minerals found in the stream

Answer explanation

Biotic factors are Living things

Which example represents territorial defense?

• A male lizard bobs his head and displays his brightly colored throat to females.

• A male prairie chicken bobs and dances around a circle of females.

• A male woodpecker drills holes in the bark of a tree to get insects.

• A male mountain lion scratches and urinates on several trees while he hunts for prey.