Why is the delivery of carbon dioxide to rubisco faster in c4 plants than in c3 plants?

Answer 1

Because c4 plants have greater numbers of oxide tanks than c3 plants!

C4 plants also have a special enzyme called Phosphoenolpyruvate carboxylase more commonly known as PEP carboxylase. While rubisco can bind to both CO2 or O2 and thus making the reaction with CO2 go slower, PEP carboxylase only binds with CO2, making the number of reactions with CO2 greater.

In a hot area, plants close their stomata to conserve water. This will result in C3 plants running out of CO2 and starting to bind RuBP with O2 in rubisco, which is called photorespiration(does not make glucose). In C4 plants, PEP carboxylase ONLY binds with CO2 and when there still is not a lot of CO2 in the cell, it still can make glucose.

Answer 2

C4 plants have a specialized pathway that concentrates carbon dioxide around the enzyme Rubisco, which helps enhance the efficiency of carbon fixation. This pathway involves the initial fixation of carbon dioxide into a four-carbon compound in mesophyll cells before transferring it to bundle sheath cells where Rubisco is located. This spatial separation of carbon fixation and Rubisco reduces the chances of oxygen competing with carbon dioxide at the active site of Rubisco, leading to faster and more efficient CO2 delivery in C4 plants compared to C3 plants.