Why is photorespiration bad for a plant?

Answer 1

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Photorespiration is a process of metabolic pathway that consumes oxygen, releases carbon dioxide, generates no ATP, and decreases photosynthetic output; generally occurs on hot, dry, bright days, when stomata close and the oxygen concentration in the leaf exceeds that of carbon dioxide.

Photorespirationoccurs because Rubisco can utilize O2 as a substrate instead of CO2. It means when stomata partially close on hot day, dry day, CO2 levels drop as CO­2 is consumed in the Calvin cycle. At the same time, O2 levels rise as the light reaction converts light to chemical energy. When the O­­2:CO2 ratio increase, there is not enough CO­2 and rubisco can add O2 to Calvin cycle (RuBP). Therefore, photorespiration consumes O2 and organic fuel and releases CO2 without producing ATP or sugar. Photorespiration reduces net C fixation considerably. Photorespiration also uses ATP & NADPH.

photorespiration is absent in c4 plants but present in c3 plants.It is because c4 plants are present in dry areas.

Answer 2

First of all, what is photorespiration? Photorespiration is a metabolic pathway of plants as an alternative to situations where the stomata close and oxygen concentration exceeds carbon dioxide concentration. The organism adds molecular oxygen to the Calvin cycle and outputs two-carbon chunks which are rearranged and split by peroxisomes and mitochondria of the plant to release carbon dioxide. However, it consumes ATP and decreases photosynthetic output and generally does not serve any direct positive purpose to the organism.

Basically, instead of making usable energy, photorespiration is actually using up more energy. It could lead to the death of the organism.

Answer 3

It causes the Calvin cycle to run without fixing carbon, wasting energy.

Answer 4

There are several places.Some are mitochondria,chloroplasts etc.

Answer 5

RuBp is downgraded