The oxygenation activity of RuBisCo enzyme in photorespiration leads to the formation of 1 molecule of 3-C compound and 1 molecule of 2-C compound.

Explanation:
1. Introduction:
- The process of photorespiration occurs in plants when the concentration of carbon dioxide (CO2) is low and oxygen (O2) concentration is high.
- RuBisCo (Ribulose-1,5-bisphosphate carboxylase/oxygenase) is an enzyme involved in the initial step of carbon fixation during photosynthesis.

2. Oxygenation activity of RuBisCo:
- Normally, RuBisCo acts as a carboxylase and catalyzes the addition of CO2 to ribulose-1,5-bisphosphate (RuBP), forming a 6-carbon compound.
- However, under certain conditions, RuBisCo can also act as an oxygenase and catalyze the addition of O2 to RuBP, resulting in the formation of a 3-carbon compound and a 2-carbon compound.

3. Formation of 1 molecule of 3-C compound:
- The oxygenation of RuBP by RuBisCo leads to the formation of a 3-carbon compound called phosphoglycolate.
- Phosphoglycolate is a product of the oxygenation reaction and cannot be utilized by the Calvin cycle for further carbon fixation.

4. Formation of 1 molecule of 2-C compound:
- The 2-carbon compound formed during the oxygenation of RuBP is called glycolate.
- Glycolate is further metabolized in the peroxisomes and mitochondria of plant cells through a series of reactions known as the photorespiratory pathway.
- This pathway results in the release of CO2 and the formation of other compounds, including glycine and serine.

5. Overall impact of RuBisCo oxygenation:
- The oxygenation activity of RuBisCo reduces the efficiency of photosynthesis by diverting carbon away from the Calvin cycle and into the photorespiratory pathway.
- It leads to the loss of fixed carbon dioxide and energy, as well as the consumption of ATP and NADPH.
- Photorespiration is considered a wasteful process as it does not contribute to the net production of carbohydrates.

In conclusion, the oxygenation activity of RuBisCo in photorespiration results in the formation of 1 molecule of a 3-carbon compound (phosphoglycolate) and 1 molecule of a 2-carbon compound (glycolate). This process reduces the efficiency of photosynthesis and leads to the loss of fixed carbon dioxide and energy.

The oxygenation activity of RuBisco enzyme in photorespiration leads to the formation of 1 molecule of 3− phosphoglyceric acid (3-C compound) and 1 molecule of phosphoglycolate (2-C compound)