Photosynthesis and Respiration Quiz

Grade 6 · Science · Quiz

Test your knowledge of how plants produce food and how cells release energy.

Questions

1. Which organelle is responsible for photosynthesis in plant cells?

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

   Answer: Chloroplast

   Chloroplasts are the organelles in plant cells that contain chlorophyll and perform photosynthesis to convert light energy into chemical energy stored in glucose.

2. What gas do plants release as a byproduct of photosynthesis?

   1. Carbon dioxide
   2. Nitrogen
   3. Oxygen
   4. Hydrogen
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   Answer: Oxygen

   Oxygen is the byproduct of photosynthesis, released when water molecules are split during the light-dependent reactions. This oxygen is what animals breathe.

3. Which of the following best describes the relationship between photosynthesis and cellular respiration?

   1. They are identical processes
   2. They are opposite processes that cycle oxygen and carbon dioxide
   3. Only plants perform both processes
   4. Respiration produces glucose; photosynthesis uses it
   Show answer

   Answer: They are opposite processes that cycle oxygen and carbon dioxide

   Photosynthesis and cellular respiration are complementary opposites: photosynthesis takes in CO2 and releases O2 while building glucose; respiration takes in O2 and releases CO2 while breaking down glucose.

4. What is the main product of cellular respiration that cells use for energy?

   1. Glucose
   2. Carbon dioxide
   3. ATP
   4. Chlorophyll
   Show answer

   Answer: ATP

   Cellular respiration produces ATP (adenosine triphosphate), which is the form of energy that cells directly use to power biological processes.

5. Through which structures do plants take in carbon dioxide from the air?

   1. Roots
   2. Stomata
   3. Chloroplasts
   4. Xylem
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   Answer: Stomata

   Stomata are tiny pores, mainly on the underside of leaves, that open to allow carbon dioxide to enter for photosynthesis and oxygen to exit as a byproduct.

6. What would most likely happen to a plant kept in total darkness for several weeks?

   1. It would grow faster without the heat from light
   2. It would perform more cellular respiration only
   3. It would die because it cannot perform photosynthesis to make food
   4. It would switch to consuming oxygen instead of producing it
   Show answer

   Answer: It would die because it cannot perform photosynthesis to make food

   Without light, a plant cannot perform photosynthesis to produce glucose. Over time, the plant will consume all stored energy through respiration and eventually die.

7. Plants only perform photosynthesis during the day and only perform respiration at night.

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   Answer: False

   Plants perform cellular respiration continuously (day and night). During the day, they also perform photosynthesis, and the net effect is oxygen production. At night, only respiration occurs.

8. The simple sugar produced during photosynthesis that fuels cellular activities is called ________.

   Show answer

   Answer: glucose

   Glucose (C6H12O6) is the simple sugar produced during photosynthesis. It serves as the primary fuel for cellular respiration and as a building block for plant growth.

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