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16. A greenhouse study shows plants gain mass during the day but lose a small amount at night. What explains this?
A. Plants perform cellular respiration at night, using stored energy
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20. How do photosynthesis and cellular respiration together help maintain balance in ecosystems?
A. They recycle oxygen and carbon dioxide between organisms and the environment.
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13. Which is a correct example of a carbon reservoir?
A. The atmosphere storing carbon dioxide
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5. During exercise, people breathe faster because ________________.
A. their bodies need more oxygen for energy and must release more carbon dioxide.
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10. Which statement best describes the movement of carbon in ecosystems?
A. Carbon moves in a continuous cycle among air, organisms, and soil.
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12. Why are decomposers important in the carbon cycle?
A. They break down dead matter and return carbon to the soil and air.
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18. In a closed ecosystem, how is mass conserved even as energy changes form?
A. Atoms are rearranged into new molecules, but the total number stays constant.
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1. During photosynthesis, which gases are exchanged between the plant and the atmosphere?
B. Carbon dioxide enters and oxygen exits.
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2. A student places identical plants at different distances from a light source. Which plant will likely release the most oxygen?
C. The one closest to the light.
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11. Which process adds carbon dioxide back to the atmosphere?
A. Cellular respiration
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19. What would happen if photosynthesis stopped worldwide?
A. Carbon dioxide would rise, oxygen would decrease, and life would decline.
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4. What are the reactants of cellular respiration?
B. Glucose and oxygen
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3. What happens to most of the oxygen produced by plants during photosynthesis?
C. It is released into the atmosphere.
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