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Which type of organism would be in Section 3 of the pyramid?

• rabbit

• owl

• snake

• grass

How is the law of conservation of energy related to the fact that ecosystems can function as open systems?

• Organisms can travel from one ecosystem to another.

• Energy destroyed in one ecosystem is created in another.

• Ecosystems can create energy for other ecosystems to use.

• Energy that leaves an ecosystem is still conserved in a larger system.

The original source of energy in most ecosystems is the sun. Producers use sunlight to convert water and carbon dioxide into surgars. What is used as the original source of energy in a small number of ecosystems?

• chemical energy

• light energy

• plants

• microorganisms

Which of the following are biotic factors?

• sunlight

• temperature

• humidity

• animals

What part of the plant soaks up water for photosynthesis?

• roots

• petals

• leaf

• stem

What are the 3 key ingredients needed for photosynthesis

• glucose, oxygen, carbon dioxide
• carbon dioxide, water, glucose
• water, soil, sunlight
• sunlight, water, carbon dioxide

Most producers get energy from the Sun using the process of

• cellular respiration
• chemosynthesis
• photosynthesis
• consumption

Which organisms are found on every level of the energy pyramid?

• Producers

• Consumers

• Decomposers

• Herbivores

Why is nitrogen fixation necessary?

• Because nitrogen can only be fixed by lightening.

• Because decomposers don't do a good job of it.

• Because animals only like the smell of fixed nitrogen.

• Because organisms can't use free nitrogen.

If the producer starts off with 250,000 kcal, how many calories will the secondary consumer have?

• 250,000 kcal

• 250 kcal

• 25,000 kcal

• 2,500 kcal