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Eighth Grade (Grade 8) Biochemical Pathways Questions

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Grade 8 Biochemical Pathways
Which chemical process happening in cells releases energy?
  1. respiration
  2. photosynthesis
  3. breathing
  4. exercise
Grade 8 Biochemical Pathways
Which is the correct word equation for 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
What are the products of respiration?
  1. water + carbon dioxide
  2. oxygen + water
  3. glucose + carbon dioxide
  4. glucose + oxygen
Grade 8 Biochemical Pathways
Why do plants convert glucose to starch?
  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
What is the equation for 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
What chemical can be used to test a leaf for starch?
  1. Iodine
  2. Limewater
  3. Ethanol
  4. hydrochloric acid
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 is the process where cells obtain energy from sugar molecules?
  1. biotic
  2. nitrogen cycle
  3. respiration
  4. food chains
Grade 8 Biochemical Pathways
How are nitrates formed?
  1. lightning
  2. nitrifying bacteria
  3. nitrogen-fixing bacteria
  4. all of the above
Grade 8 Biochemical Pathways
During which of these is O2 being released?
  1. cellular respiration
  2. photosynthesis
  3. breathing
  4. fermentation
Grade 8 Biochemical Pathways
What are the products of photosynthesis?
  1. water (H2O) and glucose (C6H12O6)
  2. glucose (C6H12O6) and carbon dioxide (CO2)
  3. carbon dioxide (CO2) and water (H2O)
  4. glucose (C6H12O6) and oxygen (O2)
Grade 8 Biochemical Pathways
Grade 8 Biochemical Pathways
What are the reactants of cellular respiration?
  1. water (H2O) and glucose (C6H12O6)
  2. glucose (C6H12O6) and carbon dioxide (CO2)
  3. carbon dioxide (CO2) and water (H2O)
  4. glucose (C6H12O6) and oxygen (O2)
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
Grade 8 Biochemical Pathways
Which of the following chemical reactions correctly summarizes photosynthesis?
  1. 4 CO2 + 6 H2O + 2 O2 = C6H12O6
  2. 6 CO2 + 6 H2O + energy = C6H12O6 + 6O2
  3. 6 H2O + 6 H2 + energy = C6H12O6
  4. 6 CO2 + 6 H2O + 6 O2 = C6H12O6 + O2
Grade 8 Biochemical Pathways
Grade 8 Biochemical Pathways
What does cellular respiration always release?
  1. oxygen
  2. carbon dioxide
  3. energy
  4. lactic acid
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
Grade 8 Biochemical Pathways
What is the source of energy for photosynthesis?
  1. sunlight
  2. carbon dioxide
  3. glucose
  4. water
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