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Eighth Grade (Grade 8) Biochemistry Questions

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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 Macromolecules
The primary function of a protein is to                             .
  1. provide energy
  2. build and repair body tissue
  3. a and b
  4. none of the above
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
What is the most important purpose of photosynthesis in plants?
  1. to create oxygen
  2. to store energy in the form of glucose
  3. to break down glucose into carbon dioxide and water
  4. to create sunlight
Grade 8 Macromolecules
What are the two groups into which carbohydrates are divided?
  1. micro and macro
  2. simple and trace
  3. simple and complex
  4. none of the above
Grade 8 Macromolecules
Which of the following correctly describes the primary function of ATP in cells?
  1. ATP is the energy that cells use to do their work.
  2. ATP creates glucose in plants.
  3. ATP uses oxygen to make plants grow.
  4. ATP is another name for chloroplasts.
Grade 8 Biochemical Pathways
What is the main photosynthetic pigment in chloroplasts?
  1. energy
  2. stomata
  3. chlorophyll
  4. cellulose
Grade 8 Macromolecules
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
Which chemical process happens in cells releasing energy?
  1. respiration
  2. photosynthesis
  3. breathing
  4. exercise
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
What is the process called when yeast and other single-celled organisms break down sugars?
  1. lactic acid fermentation
  2. photosynthesis
  3. cellular respiration
  4. alcoholic fermentation
Grade 8 Biochemical Pathways
Plants make their own food through the process of                .
  1. Gametophyte
  2. Photophychesis
  3. Phototophyte
  4. Photosynthesis
Grade 8 Biochemical Pathways
Which of these is a colored chemical that absorbs light?
  1. stomata
  2. pigment
  3. autotroph
  4. respiration
Grade 8 Biochemical Pathways
Plants take in the Sun's energy by absorbing what?
  1. high-energy carbohydrates
  2. chlorophyll
  3. chloroplasts
  4. sunlight
Grade 8 Biochemical Pathways
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
Which of the following enables nitrates to form?
  1. lightning
  2. nitrifying bacteria
  3. nitrogen-fixing bacteria
  4. all of the above
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