Read the given statements and selct the correct option.
Statement 1: Photorespiration interferes with the successful functioning of Calvin cycle.
Statement 2: Photorespiration oxidises ribulose-1,5 biphosphate which is an acceptor of `CO_(2)` in Calvin cycle.

Options

A. Both statement 1 and 2 are correct.
B. Statement 1 is correct but statement 2 is incorrect.
C. Statement 1 is incorrect but statement 2 is correct
D. Both statements 1 and 2 are incorrect.

Answer

A

Explanation

Photorespiration (Photosynthetic carbon oxidative or PCO cycle) is the light dependent process of oxygenation or ribulose-1,5-biphosphate (RuBP) and release of `CO_(2)` by the photosynthetic organs of a plant. Under normal conditions, in Calvin cycle, carboxylation of RuBP takes place whereas during photorespiration instead of carboxylation, oxygenation of RuBP takes place. This is due to abnormal behaviour of enzyme RuBisCO, which at high temperature (more than `35^(@)C`), functions as oxygenase (instead of carboxylase). Instead of fixing `CO_(2)`, it performs oxygenation of RuBP to produce a 3-carbon phosphoglyceric acid (PGA) and a 2-carbon phosphoglycolate it is the first reaction of photorespiration and can be represented as:
`RuBP+O_(2)underset("oxygenase")overset("RuBP")rarrPGA+"Phosphoglycolate"`
In this, way, photorespiration interferes with the successful functioning of Calvin cycle by causing oxygenation of RuBP instead of carboxylation.