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