Ecosystems practice quiz

What impact do resources, such as sunlight and water, have on a forest ecosystem?

• They limit the carrying capacity of the ecosystem.
• They increase habitat areas for new organisms entering the ecosystem.
• They decrease the number of diseases resulting from overpopulation.
• They alter the rate of photosynthesis, resulting in more oxygen being produced.

Which BEST describes the effect on another population in the food web below if nearly all of the field mice are removed?

• The number of lynx will increase.
• The amount of grass will decrease.
• The amount of seeds will increase.
• The number of ferrets will decrease.
  

A woodland area where deer live is partially cleared to build homes for people. Whichbest describes how the deer population will change as a result of clearing the land to build homes

• The deer population will increase.
• The deer population will decrease.
• The deer population will remain the same.
  

A certain species of snake in an ecosystem consumes frogs, salamanders, and small rodents. Which change in the ecosystem will MOST likely cause an increase in the snake population?

• A new species that eats frogs enters the ecosystem.
• The population of small rodents in the ecosystem decreased.
• The kinds of insects that salamanders eat increase in number.
• A kind of animal that eats the snake species increases in number.
  

In Florida, black bears are found in only a few regions. Roads and highways cross all of these regions. If road construction continues through the regions occupied by the bears, how will black bear populations MOST likely be affected?

• The populations will increase as the bears spread out to other areas.
• The populations will increase because other herbivores will move out.
• The populations will decrease due to pollution caused by cars and trucks.
• The populations will decrease as they have less area to find food and shelter.
  

As populations grow, they tend to spread out into new territory. Which limiting factor is most likely to become an issue?

• food
• shelter
• space
• water

Some scientists believe that the mass extinction of dinosaurs was caused by the impact of a large meteorite on Earth. This impact would have caused a darkening of the sky due to dust blown into the upper atmosphere. This darkening would have reduced the sizes of some ecosystems because of

• longer seasons.
• accelerated erosion.
• reduced photosynthesis.
• increased number of hurricanes.

Which best describes how a drought affects algae and plants?

• Algae and plants begin to die.
• The plants obtain water from algae.
• Algae and plant growth is abundant.
• Algae overtake plants with excessive growth.

Which is an abiotic factor that MOST limits the number of frogs living in a pond?

• the color of the water
• the number of predators
• the temperature of the water
• the populations of producers
  

If wolves prey on deer for food, what willmost likely happen to the deer population if wolves are removed from an area where deer live?

• The population of deer will increase.
• The population of deer will decrease.
• The population of deer will remain the same.
• The population of deer will become extinct.