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Eighth Grade (Grade 8) Biochemical Pathways Questions

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Grade 8 Biochemical Pathways
Which of the following statements correctly describes a primary distinction between respiration and photosynthesis?
  1. Photosynthesis needs oxygen, while respiration needs water
  2. Photosynthesis needs carbon dioxide, while respiration needs oxygen and sugars
  3. Photosynthesis makes oxygen, while respiration makes water
  4. Photosynthesis makes water, while respiration makes carbon dioxide
Grade 8 Biochemical Pathways
Which chemical process happens in cells releasing energy?
  1. respiration
  2. photosynthesis
  3. breathing
  4. exercise
Grade 8 Biochemical Pathways
Which of the following correctly represents the word equation for the process of respiration?
  1. oxygen + carbon dioxide -> water + glucose
  2. water + carbon dioxide -> oxygen + glucose
  3. carbon dioxide + glucose -> water + oxygen
  4. oxygen + glucose -> water + carbon dioxide
Grade 8 Biochemical Pathways
Which of the following correctly lists the products of respiration?
  1. water + carbon dioxide
  2. oxygen + water
  3. glucose + carbon dioxide
  4. glucose + oxygen
Grade 8 Biochemical Pathways
Which word equation correctly represents photosynthesis?
  1. carbon dioxide + oxygen -> glucose + water
  2. carbon dioxide + water -> glucose + oxygen
  3. oxygen + glucose -> carbon dioxide + water
  4. water + oxygen -> glucose + carbon dioxide
Grade 8 Biochemical Pathways
Why do plants generate starch from glucose?
  1. So the plant can use it to make chloroplasts
  2. So it can be stored for later
  3. because plants use it for photosynthesis
  4. because plants use it for respiration
Grade 8 Biochemical Pathways
During which of these is oxygen being released?
  1. cellular respiration
  2. photosynthesis
  3. breathing
  4. fermentation
Grade 8 Biochemical Pathways
Which of the following enable nitrates to form?
  1. lightning
  2. nitrifying bacteria
  3. nitrogen-fixing bacteria
  4. all of the above
Grade 8 Biochemical Pathways
What is the process where cells obtain energy from sugar molecules?
  1. biotic
  2. nitrogen cycle
  3. respiration
  4. food chains
Grade 8 Biochemical Pathways
What chemical can be used to test a leaf for starch?
  1. Iodine
  2. Limewater
  3. Ethanol
  4. hydrochloric acid
Grade 8 Biochemical Pathways
Grade 8 Biochemical Pathways
Grade 8 Biochemical Pathways
Which of these will not speed up the rate of photosynthesis?
  1. More sunlight
  2. Closed stomata
  3. Good water supply
  4. Good air supply
Grade 8 Biochemical Pathways
What are the products of photosynthesis?
  1. water [math](H_2O)[/math] and glucose [math](C_6H_12O_6)[/math]
  2. glucose [math](C_6H_12O_6)[/math] and carbon dioxide [math](CO_2)[/math]
  3. carbon dioxide [math](CO_2)[/math] and water [math](H_2O)[/math]
  4. glucose [math](C_6H_12O_6)[/math] and oxygen [math](O_2)[/math]
Grade 8 Biochemical Pathways
Grade 8 Biochemical Pathways
Grade 8 Biochemical Pathways
What are the reactants of cellular respiration?
  1. water [math](H_2O)[/math] and glucose [math](C_6H_12O_6)[/math]
  2. glucose [math](C_6H_12O_6)[/math] and carbon dioxide [math](CO_2)[/math]
  3. carbon dioxide [math](CO_2)[/math] and water [math](H_2O)[/math]
  4. glucose [math](C_6H_12O_6)[/math] and oxygen [math](O_2)[/math]
Grade 8 Biochemical Pathways
Which of the following is TRUE statement about cellular respiration?
  1. Cellular respiration converts energy directly from the sun into energy stored in chemical bonds
  2. Cellular respiration cannot occur without sunlight
  3. Cellular respiration occurs in plant cells and in animal cells
  4. Cellular respiration is not a cycle with photosynthesis
Grade 8 Biochemical Pathways
What process produces carbon dioxide?
  1. photosynthesis
  2. replication
  3. mutation
  4. respiration
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