The sunlight is used during photosynthesis to:

transport water and minerals in the plant

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break down the water molecules

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open the guard cells

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break down the cell wall

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Solution

The correct option is B
break down the water molecules

Light energy is absorbed by chlorophyll, a green substance found in chloroplasts in some plant cells and algae. Absorbed light energy is used to convert carbon dioxide (from the air) and water (from the soil) into a carbohydrate compound. Oxygen is released as a by-product. The chemical reaction involved in the process of photosynthesis is given below:

$6 C O_{2} + 12 H_{2} O s u n l i g h t \to c h l o r o p h y l C_{6} H_{12} O_{6} + 6 O_{2} + 6 H_{2} O$

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