Question

Which one of the following is wrong in relation to photorespiration ?

• A. It occurs in chloroplast
• B. It occurs in day time only
• C. It is a characteristic of $C_{4}$ plants
• D. It is a characteristic of $C_3$ plants

Answer 1

Answer: (C)

It is a characteristic of $C_{4}$ plants

Answer 2

Photorespiration is a type of respiration which occurs in green cells in presence of light. It involves three organelles - chloroplast, peroxisomes and mitochondria. Respiratory substrate in photorespiration is a 2-carbon compound glycolic acid (2C), hence called C2 cycle. RuBP-carboxylase in normal O2/CO2 conc, acts as 'carboxylase'. It is the key enzyme of photosynthesis in C3 plants.