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Matter and Energy Transformation
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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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15.When carbon moves between the atmosphere, plants, and animals, the total amount of carbon stays the same. What scientific law explains this?
A. Law of Conservation of Mass
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9. A rabbit eats grass and then runs. What energy transformation occurs?
A. Chemical energy in grass → mechanical energy in rabbit’s muscles
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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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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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1. During photosynthesis, which gases are exchanged between the plant and the atmosphere?
B. Carbon dioxide enters and oxygen exits.
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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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8. Which shows how energy changes form in living systems?
A. Light → chemical → mechanical energy
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6. How do both plants and animals use glucose?
A. To produce energy during cellular respiration.
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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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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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7. What part of the cell performs cellular respiration?
C. Mitochondrion
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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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14.The equation for photosynthesis shows the same number of atoms before and after the reaction. What does this demonstrate?
A. Matter is conserved.
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17.Students observe that photosynthesis rate increases with light but levels off at high intensity. What conclusion fits this data?
A. Other factors limit photosynthesis beyond a certain light level.
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4. What are the reactants of cellular respiration?
B. Glucose and oxygen
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11. Which process adds carbon dioxide back to the atmosphere?
A. Cellular respiration
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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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