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Which of the following equations is the summary of photosynthesis?
A. 6CO2+12H2OC6H12O6+6O2+6H2O
B. 6CO2+H2O+sunlightC6H12O6+O2+6H2O
C. 6CO2+12H2O+chlorophyll+sunlightC6H12O6+6O2+6H2O
D. 6CO2+12H2O+chlorophyll+sunlightC6H12O6+6CO2+6H2O

Answer
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Hint: In order to answer this question we should know about the process called photosynthesis. Photosynthesis is the process through which green plants are able to convert light energy into chemical energy.

Complete answer:
Photosynthesis is the multi-step process which is using the energy in sunlight to make food i.e. glucose and release oxygen gas in the atmosphere. It is a complex process rather than a simple statement.
So basically, photosynthesis is a multistep biochemical process that uses the energy in sunlight to fix carbon dioxide CO2 , transferring the energy into carbohydrates or glucose C6H12O6 , and releasing oxygen O2 , in the process.
Photosynthesis generally takes place in the leaves of the plants which contain chlorophyll. This process requires sunlight, carbon dioxide and water as substrates. The energy of the sunlight drives the reaction between carbon dioxide and water to produce sugar and oxygen.
The chemical reaction that takes place during photosynthesis is as follows:
 6CO2+12H2O+chlorophyll+sunlightC6H12O6+6O2+6H2O
So, this equation is the summary of photosynthesis.
Therefore, the correct answer is option (C).

Note:
It must be noted that chlorophyll plays a very important role in the photosynthesis process. The function of chlorophyll is to absorb energy from sunlight and supply the energy to the leaves to enable them to carry out photosynthesis for making food. The plants which do not have green leaves means they do not contain chlorophyll in it. This indicates that they do not undergo the photosynthesis process. Therefore, all the components given in the equation of photosynthesis are essential for this process.