What must a plant need to produce 4 molecules of sugar?

A. 6 molecules of [tex]$CO_2$[/tex]
B. 6 molecules of [tex]$H_2O$[/tex]
C. 18 molecules of [tex]$CO_2$[/tex]
D. 24 molecules of [tex]$H_2O$[/tex]



Answer :

To determine what a plant needs to produce 4 molecules of sugar (C6H12O6) through the process of photosynthesis, we start by looking at the balanced chemical equation for photosynthesis:

[tex]\[ \text{6 CO}_2 + \text{6 H}_2\text{O} \rightarrow \text{C}_6\text{H}_{12}\text{O}_6 + \text{6 O}_2 \][/tex]

This equation shows that 6 molecules of carbon dioxide (CO2) and 6 molecules of water (H2O) are needed to produce 1 molecule of sugar.

We want to produce 4 molecules of sugar, therefore:

1. Calculate the molecules of CO2 needed for 4 molecules of sugar:
- If 6 molecules of CO2 produce 1 molecule of sugar,
- To produce 4 molecules of sugar, we need:
[tex]\[ \text{Molecules of CO2} = 6 \times 4 = 24 \][/tex]

2. Calculate the molecules of H2O needed for 4 molecules of sugar:
- If 6 molecules of H2O produce 1 molecule of sugar,
- To produce 4 molecules of sugar, we need:
[tex]\[ \text{Molecules of H2O} = 6 \times 4 = 24 \][/tex]

Thus, to produce 4 molecules of sugar, a plant must need:

- 24 molecules of CO2
- 24 molecules of H2O

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