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Matter and Energy Transformation
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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.
19. What would happen if photosynthesis stopped worldwide?
A. Carbon dioxide would rise, oxygen would decrease, and life would decline.
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.
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.
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
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
14.The equation for photosynthesis shows the same number of atoms before and after the reaction. What does this demonstrate?
A. Matter is conserved.
13. Which is a correct example of a carbon reservoir?
A. The atmosphere storing carbon dioxide
12. Why are decomposers important in the carbon cycle?
A. They break down dead matter and return carbon to the soil and air.
11. Which process adds carbon dioxide back to the atmosphere?
A. Cellular respiration
10. Which statement best describes the movement of carbon in ecosystems?
A. Carbon moves in a continuous cycle among air, organisms, and soil.
9. A rabbit eats grass and then runs. What energy transformation occurs?
A. Chemical energy in grass → mechanical energy in rabbit’s muscles
8. Which shows how energy changes form in living systems?
A. Light → chemical → mechanical energy
7. What part of the cell performs cellular respiration?
C. Mitochondrion
6. How do both plants and animals use glucose?
A. To produce energy during cellular respiration.
5. During exercise, people breathe faster because ________________.
A. their bodies need more oxygen for energy and must release more carbon dioxide.
4. What are the reactants of cellular respiration?
B. Glucose and oxygen
3. What happens to most of the oxygen produced by plants during photosynthesis?
C. It is released into the atmosphere.
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.
1. During photosynthesis, which gases are exchanged between the plant and the atmosphere?
B. Carbon dioxide enters and oxygen exits.
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