Organisms that use energy from the sun to make their own food are called

• A. carnivores

• B. consumers

• C. omnivores

• D. producers

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In which organelle does photosynthesis occur?

• A. Mitochondria

• B. Chloroplast

• C. Lysosome

• D. Nucleus

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Why is the presence of chlorophyll in plants important?

• A. It assembles the sugar

• B. It creates ATP to power the process

• C. It captures water to be used in the process

• D. It absorbs the solar energy needed to create the sugar

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After photosynthesis is finished inside of a plant, six molecules of oxygen have been produced, as well as a single molecule of C6H12O6, otherwise known as

• A. carbon dioxide

• B. water

• C. oxygen

• D. glucose

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During photosynthesis, different gases move in and out of plant cells. Which phrase best represents the net flow of gases involved in photosynthesis?

• A. Carbon dioxide moves in; oxygen moves out

• B. Oxygen moves in; carbon dioxide moves out

• C. Carbon dioxide moves in; nitrogen moves out

• D. Oxygen moves in; nitrogen moves out

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The figure to the right shows the current composition of the Earth’s atmosphere. What would be different about the composition before the evolution of photosynthetic organisms?

• A. The trace element section would have been smaller

• B. The nitrogen component of this graph would be larger

• C. The oxygen component of this graph would have been smaller

• D. The oxygen component of this graph would have been larger

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What will MOST LIKELY happen if a new producer is introduced into a food web?

• A. The omnivores will decrease

• B. The herbivores will increase

• C. The carnivores will decrease

• D. The decomposers will decrease

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Overall, photosynthesis is a reaction that

• A. absorbs energy, and is exothermic

• B. absorbs energy, and is endothermic

• C. releases energy, and is exothermic

• D. releases energy, and is endothermic

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In the food web to the right, what would be a direct impact of an increase in the amount of toads in the ecosystem?

• A. an increase in the population of squirrels

• B. a decrease in the population of owls

• C. an increase in the population of snakes

• D. a decrease in the rabbit population

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In food chains, the flow of energy is ALWAYS _________.

• A. one-way

• B. reversible

• C. two-way

• D. uncontrolled

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