Photosynthesis and Cellular Respiration Quiz

Grade 7 · Science · Quiz

10-question quiz covering the reactions, locations, and importance of photosynthesis and cellular respiration.

Questions

1. Which gas do plants take in during photosynthesis?

   1. Oxygen
   2. Nitrogen
   3. Carbon dioxide
   4. Hydrogen
   Show answer

   Answer: Carbon dioxide

   Plants absorb carbon dioxide (CO₂) through tiny pores called stomata and use it as a raw material in photosynthesis.

2. Cellular respiration occurs only in animal cells.

   Show answer

   Answer: False

   Cellular respiration happens in virtually all living cells, including plant cells, fungi, and bacteria.

3. Cellular respiration takes place in the ___.

   Show answer

   Answer: mitochondria

   The mitochondria are the site of most ATP production during cellular respiration.

4. What three things are required for photosynthesis?

   1. Oxygen, water, and glucose
   2. Sunlight, carbon dioxide, and water
   3. ATP, glucose, and oxygen
   4. Carbon dioxide, ATP, and chlorophyll
   Show answer

   Answer: Sunlight, carbon dioxide, and water

   Photosynthesis requires sunlight (energy), CO₂ (carbon source), and water (hydrogen source) to produce glucose and oxygen.

5. Glucose is the product of photosynthesis and the reactant of cellular respiration.

   Show answer

   Answer: True

   Glucose flows from photosynthesis into cellular respiration, creating a cycle of energy transformation.

6. What is the byproduct of cellular respiration that animals exhale?

   1. Oxygen
   2. Glucose
   3. Carbon dioxide
   4. Nitrogen
   Show answer

   Answer: Carbon dioxide

   CO₂ is a waste product of cellular respiration; animals exhale it from their lungs after gas exchange in the blood.

7. Plants store excess glucose as ___ for later use.

   Show answer

   Answer: starch

   Starch is a polysaccharide — many glucose molecules bonded together — that plants use for long-term energy storage.

8. Photosynthesis and cellular respiration have opposite reactants and products.

   Show answer

   Answer: True

   Photosynthesis: CO₂ + H₂O → glucose + O₂. Respiration: glucose + O₂ → CO₂ + H₂O. They are chemical opposites.

9. Which pigment gives plants their green color and absorbs light for photosynthesis?

   1. ATP
   2. Glucose
   3. Chlorophyll
   4. Cellulose
   Show answer

   Answer: Chlorophyll

   Chlorophyll is the primary photosynthetic pigment. It reflects green wavelengths (which is why plants look green) and absorbs red and blue light.

10. Where in a plant cell does photosynthesis take place?

    1. Nucleus
    2. Mitochondria
    3. Ribosome
    4. Chloroplast
    Show answer

    Answer: Chloroplast

    Chloroplasts are specialized organelles containing chlorophyll and the molecular machinery for photosynthesis.

Get a personalized course on Photosynthesis and Cellular Respiration built around your child.