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Eighth Grade (Grade 8) Biochemical Pathways Questions

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Grade 8 Biochemical Pathways
In what process do cells obtain energy from sugar molecules?
  1. photosynthesis
  2. nitrogen cycle
  3. respiration
  4. food chains
Grade 8 Biochemical Pathways
Which statement 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
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
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
Which chemical process happens in cells to release energy?
  1. respiration
  2. photosynthesis
  3. breathing
  4. exercise
Grade 8 Biochemical Pathways
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
What does cellular respiration always release?
  1. oxygen
  2. carbon dioxide
  3. energy
  4. lactic acid
Grade 8 Biochemical Pathways
Which chemical reaction correctly summarizes photosynthesis?
  1. [math]4 CO_2 + 6 H_2O + 2 O_2 = C_6H_12O_6[/math]
  2. [math]6 CO_2 + 6 H_2O + "energy" = C_6H_12O_6 + 6O_2[/math]
  3. [math]6 H_2O + 6 H_2 + "energy" = C_6H_12O_6[/math]
  4. [math]6 CO_2 + 6 H_2O + 6 O_2 = C_6H_12O_6 + O_2[/math]
Grade 8 Biochemical Pathways
Which word equation represents 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
What is the source of energy for photosynthesis?
  1. sunlight
  2. carbon dioxide
  3. glucose
  4. water
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
Which is a product of photosynthesis?
  1. carbon dioxide
  2. light energy
  3. oxygen
  4. carbon monoxide
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
Which statement is TRUE statement about cellular respiration?
  1. Cellular respiration converts energy directly from the Sun into energy stored in chemical bonds.
  2. Cellular respiration occurs in plant cells and in animal cells.
  3. Cellular respiration cannot occur without sunlight.
Grade 8 Biochemical Pathways
Which statement is TRUE about photosynthesis?
  1. It occurs only in cells that contain chlorophyll.
  2. It occurs when light energy is not available.
  3. It does not form a cycle with cellular respiration.
  4. It converts sugar and oxygen into carbon dioxide and water.
Grade 8 Biochemical Pathways
What are the products of cellular respiration?
  1. sugar, oxygen, and energy
  2. carbon dioxide, water, and energy
  3. oxygen, water, and energy
  4. carbon dioxide, sugar, and energy
Grade 8 Biochemical Pathways
What process produces carbon dioxide?
  1. photosynthesis
  2. replication
  3. mutation
  4. cellular respiration
Grade 8 Biochemical Pathways
Why do plants generate starch from glucose?
  1. Plants can use starch to make chloroplasts.
  2. Plants store energy for later as starch.
  3. Plants use starch for photosynthesis.
  4. Plants use starch for respiration.
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