Which of the following statements accurately describes the relationship between photosynthesis and cellular respiration?

photosynthesis occurs only in autotrophs; cellular respiration occurs only in heterotrophs

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photosynthesis uses solar energy to convert inorganics to energy-rich organics; respiration breaks down energy-rich organics to synthesize ATP

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photosynthesis involves the oxidation of glucose; respiration involves the reduction of CO2

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the primary function of photosynthesis is to use solar energy to synthesize ATP; the primary function of cellular respiration is to break down ATP and release energy

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Solution

The correct option is B
photosynthesis uses solar energy to convert inorganics to energy-rich organics; respiration breaks down energy-rich organics to synthesize ATP

Cellular respiration can be considered as the reverse process of photosynthesis. While photosynthesis uses the basic organic compounds such as carbon dioxide and water to synthesize glucose and release oxygen, in cellular respiration glucose is broken down in presence of oxygen into carbon dioxide and water once again.

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Q. It is given that in photosynthesis

C O_{2} + H_{2} O

forms

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

but respiration involves oxidation of

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

C O_{2}

and

H_{2} O

for producing energy so can't plants directly use

C O_{2}

and

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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