Question

the diagram above shows how carbon dioxide, glucose, oxygen, and water cycle between plants and animals through photosynthesis and cellular respiration.

label the numbered parts of the diagram above with the correct molecule.

Explanation:

Step1: Analyze the green arrow (plant to molecule)

Plants perform photosynthesis, taking in \(CO_2\) and \(H_2O\) to produce glucose (\(C_6H_{12}O_6\)) and \(O_2\). The green arrow points from the plant to the molecule (label 2), so this should be glucose (product of photosynthesis, used by animals in respiration).

Step2: Analyze the green arrow (sun to plant)

The sun provides energy for photosynthesis, and the green arrow (label 1) is from the sun to the plant. The molecule here should be \(CO_2\) (entering the plant for photosynthesis? Wait, no—wait, the cycle: plants take in \(CO_2\) (from air, label 1 could be \(CO_2\)), produce glucose (label 2). Then animals consume glucose, respire, release \(CO_2\) (red arrow? Wait, the diagram: green arrow from sun/plant? Wait, re - examining: the green arrow has two parts: from sun (energy) and from the air (molecule 1) to the plant, then plant to molecule 2. So:

• Label 1: \(CO_2\) (carbon dioxide) – plants take in \(CO_2\) for photosynthesis.
• Label 2: \(C_6H_{12}O_6\) (glucose) – product of photosynthesis, moves to animals.
• Label 3: \(O_2\) (oxygen) – product of photosynthesis, released by plants, used by animals in respiration.
• Label 4: \(H_2O\) (water) – involved in photosynthesis and respiration, or water vapor in the cycle.

Let's confirm: Photosynthesis equation: \(6CO_2 + 6H_2O \xrightarrow{\text{light}} C_6H_{12}O_6 + 6O_2\). Respiration (animal): \(C_6H_{12}O_6 + 6O_2
ightarrow 6CO_2 + 6H_2O + \text{energy}\).

So:

• 1: \(CO_2\) (carbon dioxide, taken in by plant for photosynthesis)
• 2: \(C_6H_{12}O_6\) (glucose, produced by plant, used by animal)
• 3: \(O_2\) (oxygen, produced by plant, used by animal in respiration)
• 4: \(H_2O\) (water, involved in the cycle, either as liquid or vapor)

Answer:

1: Carbon Dioxide (\(CO_2\)); 2: Glucose (\(C_6H_{12}O_6\)); 3: Oxygen (\(O_2\)); 4: Water (\(H_2O\))