Final Exam Life Science

Which of the following describes a population?

• 85 great white sharks off Cape Cod
• thousands of dolphins and whales around Hawaii
• a mating pair of seagulls migrating to an island
• corals, sponges, algae, reef fish, lobsters, and giant clams

Which of the following is a biotic factor that might limit a population of mice?

• water for the mice to drink
• rainy weather that floods the mice’s nests
• owls that prey on the mice
• rocks in which the mice can hide from predators

In terms of its effect on population, which factor is most similar to birth rate?

• emigration
• density
• immigration
• carrying capacity

What do consumers release as they break down food to obtain energy?

• sugar
• carbon dioxide and water
• free nitrogen
• oxygen

Rain, hail, and snow are all examples of

• condensation.
• evaporation.
• erosion.
• precipitation.

In one form of nitrogen fixation, the __________ energy of __________ splits nitrogen molecules into atoms.

• chemical, water vapor
• mechanical, consumers
• electrical, lightning
• released, bacteria

Which of the following terms refers to a straight series of connections among organisms that feed on each other?

• food web
• ecosystem
• community
• food chain

Mushrooms and bacteria are important

• predators.
• decomposers.
• producers.
• herbivores.

Which of the following describes a food web?

• A linear sequence of organisms where each is eaten by the next one in the chain.
• A network of interconnected food chains showing the feeding relationships in an ecosystem.
• A graphical representation of the energy flow through different trophic levels in an ecosystem.
• A diagram showing the various trophic levels and energy transfer efficiency in an ecosystem.

Which of the following is true about energy pyramid?

• As you move up the energy pyramid from primary producers to top-level consumers, the amount of available energy increases.
• The base of the energy pyramid is composed of primary consumers.
• Typically, only about 10% of the energy at one trophic level is passed on to the next level.
• There are usually more organisms as you move up the energy pyramid.