Question

the diagram shows two different processes that occur in plants.

process 1: a plant with a leaf labeled with carbon dioxide gas entering, oxygen gas exiting, and a box saying sunlight is used as an energy source.
process 2: a plant with a leaf labeled with oxygen gas entering, carbon dioxide gas exiting, and a box saying glucose is used as an energy source.

which action provides the glucose to use in process 2?

• the roots of the plant absorb glucose.
• the stomata of the plant absorb glucose.
• respiration in process 1 produces glucose.
• photosynthesis in process 1 produces glucose

Explanation:

To determine the source of glucose for Process 2, we analyze the processes:

• Process 1 uses sunlight, takes in \( \ce{CO_2} \), and releases \( \ce{O_2} \), which is photosynthesis. Photosynthesis produces glucose (\( \ce{C_6H_{12}O_6} \)) and oxygen.
• Process 2 uses glucose as an energy source, takes in \( \ce{O_2} \), and releases \( \ce{CO_2} \), which is cellular respiration. Respiration uses glucose, so glucose must come from a process that produces it.
• Roots absorb water and minerals, not glucose. Stomata exchange gases, not absorb glucose. Respiration (Process 2 - like) uses glucose, not produce it. Thus, photosynthesis in Process 1 produces glucose for Process 2.

Answer:

D. Photosynthesis in Process 1 produces glucose