1. When an animal metabolizes its food, what is the primary carbon-containing waste product it releases?
- A. Methane
- B. Carbon dioxide
- C. Glucose
- D. Carbon monoxide
2. A scientist places a mouse in a sealed, transparent container with a sensor to measure gas concentrations. Which change would be the most direct evidence of the mouse's respiration?
- A. A steady decrease in the concentration of nitrogen gas.
- B. A steady increase in the concentration of oxygen gas.
- C. A steady increase in the concentration of carbon dioxide gas.
- D. A complete stabilization of all gas levels within the container.
3. Which statement best contrasts the roles of photosynthesis and respiration in the carbon cycle?
- A. Respiration removes carbon dioxide from the atmosphere, while photosynthesis releases it.
- B. Photosynthesis captures atmospheric carbon in organic molecules, while respiration releases it.
- C. Both processes are performed only by animals to cycle carbon through the food web.
- D. Photosynthesis transfers carbon from the soil to the air, while respiration moves it from the air to the soil.
4. A deer eats leaves from a tree and later breathes out. In the context of the carbon cycle, this act of breathing primarily represents a transfer of carbon between which two spheres?
- A. From an abiotic source to another abiotic source.
- B. From a biotic source to another biotic source.
- C. From an abiotic source to a biotic source.
- D. From a biotic source to an abiotic source.
5. The biological process that involves metabolizing food to produce energy, which in turn moves carbon from organic tissue back into the atmosphere, is known as:
- A. Photosynthesis
- B. Transpiration
- C. Respiration
- D. Decomposition
6. In a sealed, self-sustaining aquarium containing only aquatic plants and fish, what is the primary role of the fish in supporting the plants?
- A. They consume excess plants to make space.
- B. They produce carbon dioxide through respiration.
- C. They generate light for the plants to use.
- D. They release oxygen into the water for the plants.
7. A scientist wants to maximize the rate of photosynthesis in a batch of algae. Based on the biological cycle of matter, which two substances should be supplied in abundance?
- A. Oxygen and glucose
- B. Sunlight and oxygen
- C. Carbon dioxide and water
- D. Glucose and carbon dioxide
8. Which of the following accurately represents the exchange of key gases between a plant and an animal in a balanced ecosystem?
- A. The plant provides CO2 to the animal, and the animal provides O2 to the plant.
- B. The plant provides O2 to the animal, and the animal provides CO2 to the plant.
- C. The plant provides O2 to the animal, and the animal also provides O2 to the plant.
- D. Both the plant and the animal provide each other with a mix of O2 and CO2.
9. Which statement best describes the relationship between photosynthesis and cellular respiration in an ecosystem?
- A. They are independent processes that occur in different organisms and do not affect each other.
- B. Photosynthesis is a process that breaks down sugars to release energy, while respiration builds them.
- C. They are reciprocal processes where the waste products of one become the essential raw materials for the other.
- D. Both processes produce oxygen and consume carbon dioxide, working together to increase atmospheric oxygen.
10. What are the primary products generated by cellular respiration that are then used as reactants for photosynthesis?
- A. Oxygen and sugar
- B. Carbon dioxide and water
- C. Light energy and heat
- D. Nitrogen and minerals