Question

Plants impaired in ability to carry out photorespiration?

1) C3 plants
2) C4 plants
3) CAM plants
4) All of the above

Answer 1

1) C3 plants are impaired in their ability to carry out photorespiration due to stomatal closure, resulting in a shortage of CO2 and an increase in O2 levels. This leads to the oxygenase activity of Rubisco and the formation of a 3-carbon compound and phosphoglycolate.

Step-by-step explanation:

The plants impaired in their ability to carry out photorespiration are C3 plants. C3 plants, such as maple trees, use the C3 pathway for carbon fixation. During prolonged hot and dry spells, C3 plants close their stomata to conserve water, resulting in a shortage of CO2 and an increase in O2 levels in the leaves. This leads to the oxygenase activity of the enzyme Rubisco, causing the fixation of O2 instead of CO2 and the formation of a 3-carbon compound and phosphoglycolate.