Plants Manufacture Food Through Photosynthesis

Plants are unique organisms that can make their own food. This process is called photosynthesis. Photosynthesis allows plants to convert light energy into chemical energy stored in food.

For plants to manufacture their food, they need specific ingredients from their environment. These essential components are absorbed by different parts of the plant.

The key requirements for photosynthesis are:

• Water: Absorbed by the roots from the soil.
• Sunlight: Energy captured by chlorophyll, the green pigment in leaves.
• Carbon Dioxide ($\text{CO}_2$): Absorbed from the atmosphere through tiny pores on the leaves called stomata.

During photosynthesis, plants use sunlight energy to combine water ($\text{H}_2\text{O}$) and carbon dioxide ($\text{CO}_2$) to create glucose (a type of sugar, which is their food) and oxygen ($\text{O}_2$) as a byproduct. The simple equation is:

$\text{CO}_2 + \text{H}_2\text{O} + \text{Sunlight Energy} \rightarrow \text{Glucose} (\text{Food}) + \text{O}_2$

Let's look at the given options:

• Option 1: Oxygen, sunlight, water. Oxygen is a product of photosynthesis, not a requirement for making food.
• Option 2: $\text{CO}_2$, Oxygen, sunlight. Again, Oxygen is a product, not a necessary ingredient.
• Option 3: Water, sunlight, $\text{CO}_2$. These are the three main components needed for photosynthesis.
• Option 4: Oxygen, sunlight. This option includes oxygen (a byproduct) and misses carbon dioxide and water.

Therefore, plants manufacture their food using water, sunlight, and carbon dioxide.