Plants make food through photosynthesis, a chemical reaction. What are the starting substances of the reaction?

Carbondioxode and water are starting substances of the photosynthesis reaction.

Explanation: Photosynthesis is a process in which plants prepare their own food in the presence of sunlight. In photosynthesis, plant absorbed water from the soil and carbondioxode gas from the air through small opening called stomata. These two raw materials combine together in the presence of sunlight produces glucose and oxygen.

The starting substances for photosynthesis are carbon dioxide, water and sunlight.

Explanation: Plants have Chlorophyll, a green pigment found in the Chloroplast. A Chloroplast is a membrane bound organelle found in plant cells which houses the chlorophyll. Plants use chlorophyll to trap energy from the sun. The solar energy trapped by the chlorophyll is used to drive the synthesis of glucose in the presence of carbon dioxide and water. The equation for photosynthesis is 6 CO2+ 6 H2O+ solar energy --> C6H12O6 + 6O2. For photosynthesis to occur, there must be chlorophyll, sunlight, carbon dioxide and water.

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