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Gaseous Exchange in Plants

Since photosy...

Question

Since photosynthesis begins with 2 reactants co2 and h2o, is it right to say light phase is responsible for breakdown of h2o and dark phase is responsible for breakdown of co2 into their respective biproducts?

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Solution

No breakdown of CO2, usage of CO2 to make food.

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Q. It is given that in photosynthesis

C O_{2} + H_{2} O

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

but respiration involves oxidation of

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

C O_{2}

H_{2} O

for producing energy so can't plants directly use

C O_{2}

H_{2} O

to synthesize energy (in form of ATP) that they had obtained from atmosphere and water. If so then what's the use of photosynthesis for plants.

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H_{2} O

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(A)

C O_{2}

H_{2} O

C O_{2}

H_{2} O

C O_{2}

is reduced to from glucose
(D)

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O_{2}

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