$6 C O_{2} + 12 H_{2} O L i g h t - -- \to C_{6} H_{12} O_{6} + 6 H_{2} O + 6 O_{2}$
where $C_{6} H_{12} O_{6}$ represents glucose. The $O_{2}$ released is form water ; this was proved using radio isotope techniques. Note that this is not a single reaction but description of a multistep process called photosynthesis. Can you explain why twelve molecules of water as substrate are used in the equation given above ?

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Solution

The twelve molecules of water are used in the process of photosynthesis because for this process to occur it requires 12 NADPH molecules. Two molecules of NADPH require two water molecule to balance electron and proton in the reaction, so for the formation of 12 NADPH molecules, 12 water molecules are required.

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6 C O_{2} + 12 H_{2} O L i g h t \to C_{6} H_{12} O_{6} + 6 H_{2} O + 6 O_{2}

.
where

C_{6} H_{12} O_{6}

represents glucose. The

O_{2}

released is from water; this was proved using radio isotope techniques. Note that this is not a single reaction but description of a multistep process called photosynthesis. Can you explain why twelve molecules of water as substrate are used in the equation given?

Q. Can you explain why twelve molecules of water as substrate are used in the equation given?

6 C O_{2} + 12 H_{2} O L i g h t \to C_{6} H_{12} O_{6} + 6 H_{2} O + 6 O_{2}

Question 27
Which of the following equations is the summary of photosynthesis?

(a) $6 C O_{2} + 12 H_{2} O \to C_{6} H_{12} O_{6} + 6 O_{2} + 6 H_{2} O$
(b) $6 C O_{2} + H_{2} O + S u n l i g h t \to C_{6} H_{12} O_{6} + O_{2} + 6 H_{2} O$
(c) $6 C O_{2} + 12 H_{2} O + C h l o r o p h y l l + S u n l i g h t \to C_{6} H_{12} O_{6} + 6 O_{2} + 6 H_{2} O$
(d) $6 C O_{2} + 12 H_{2} O + C h l o r o p h y l l + S u n l i g h t \to C_{6} H_{12} O_{6} + 6 C O_{2} + 6 H_{2} O$

CO₂ + H₂O → C₆H₁₂O₆ + O₂ + H₂O

Is the given equation correct? If not, correct it.

Balance the given equation:

CO2+H2O---->C6H12O6+O2+H2O

ANS .(1) 6CO2+7H2O----->C6H12O6+6O2+H2O is incorrect

Where as (2) 6CO2+12H2O------>C6H12O6+6O2+6H2O is correct.

Why first answer is incorrect and second answer is correct

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