Ecology Test 2

Humans have a tremendous impact on the environment. What has caused an increase in the amount of acid rain?

• Coal-burning power plants

• Use of solar power cells

• Running hydroelectric dams

• Wind-powered turbines

One major contributor to global warming is an increased amount of carbon dioxide in the atmosphere. If the number of living plants significantly increased, --

• Global warming might get worse because of the increase in carbon dioxide caused by photosynthesis.

• Global warming might be reduced because of the decrease in carbon dioxide caused by photosynthesis.

• There will not be a noticeable impact on atmospheric greenhouse gases

• There will not be a noticeable impact on atmospheric greenhouse gases

The brown tree snake originated in the South Pacific and Australia. It was brought to the island of Guam, where it has killed 10 of 13 native bird species, 6 of 12 native lizard species, and 2 of 3 bat species. What is the Brown Tree Snake an example of?

• Native Species

• Invasive Species

• Pioneer Species

• Keystone Species

Which of the following is a way that human population growth is connected to the consumption of water and power?

• The larger the population grows, the less we use the resources available.

• The larger the population grows, the more we use the resources available.

• The smaller the population, the fewer the resources available.

• The smaller the population, the more we use the resources available.

Invasive species may harm an ecosystem by –

• creating new symbiotic relationships.

• providing humans with a new food source.

• altering abiotic factors in the habitat.

• outcompeting native species.

Algae and multicellular plants are autotrophs because they ---

• absorb nutrients from soil.

• break down starches to glucose.

• produce their own food in the form of sugars.

• decompose dead organisms.

Wind and solar power are examples of renewable resources because they ---

• are limited for rural use only.

• can never be used up completely.

• are readily accessible anywhere in the world, anytime of the year.

• will eventually run out if humans do not practice conservation methods.

based on the flow of energy through photosynthesis and cellular respiration, one can say that the ultimate original source of energy for MOST living things on Earth is ---

• glucose

• water

• the sun

• carbon dioxide

Decomposers are important in a food chain because they

• produce their own food using light from the sun.

• stop the flow of energy from one organism to another.

• break down dead organisms and recycle nutrients into the soil.

• are microscopic and other organisms cannot consume them.

Which of the following best explains why there are seldom more than five trophic levels in a food chain?

• Trophic levels above this number contain too many individuals.

• Most carnivores function at more than one trophic level.

• The ecosystem contains too much biomass.

• Energy is lost from each trophic levels.