why photorespiration is a wasteful product?

In photorespiration, instead of CO2 being added by RuBisCo to RuBP, O2 (Oxygen) is instead. This is a result of hot & dry weather in which a plant closes certain pores called stomata so that water doesn't evaporate from its cells. The outcome caused by photorespiration is thus considered wasteful because when O2 travels through the Calvin Cycle rather than CO2, the end result is a release of CO2 into the surrounding atmosphere and NO production of sugar which the plant needs as a source of energy. Not to mention, the light reactions of photosynthesis which normally produce products needed by the Calvin Cycle to convert CO2 to sugar (stored energy), are simply wasted in photorespiration because nothing essential to the cell is produced.




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 It is bcoz ;

:there is loss of photosynthetically fixed carbon.

:no energy-rich compounds are produced.

Actually it decreases the efficiency of photosynthesis and decrease the plant's productivity too.....

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Bcoz it consumes energy in the form of ATP
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Collect different types of seed of and put them in small bags
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Thus, photorespiration is a wasteful process because it prevents plants from using their ATP and NADPH to synthesize carbohydrates. RuBISCO, the enzyme which fixes carbon dioxide during the Calvin cycle, is also responsible for oxygen fixation during photorespiration.
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In the photorespiratory pathway , there is neither synthesis of  sugars , nor of ATP . Rather it results in the of CO2 with the utilisation of ATP . in the photorespiratory pathway there is no synthesis of ATP or NADPH . Therefore , photorespiration is a wasteful process 
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