1
Question
As compared to a C3-plants how many additional molecules of ATP are needed for net production of one molecule of a hexose sugar by C4-plants
As compared to a C3-plants how many additional molecules of ATP are needed for net production of one molecule of a hexose sugar by C4-plants
Open in App
Solution
The correct option is D 12
Every CO2 molecule has to be fixed twice, first by 4-carbon organic acid and second by RuBisCO, the C4 pathway uses more energy than the C3 pathway. The C3 pathway requires 18 molecules of ATP for the synthesis of one molecule of glucose, whereas the C4 pathway requires 30 molecules of ATP. This energy debt of more 12 ATPs is more than paid for by avoiding losing more than half of photosynthetic carbon in photorespiration as occurs in some tropical plants,making it an adaptive mechanism for minimising the loss.So, the correct answer is option D.
Every CO2 molecule has to be fixed twice, first by 4-carbon organic acid and second by RuBisCO, the C4 pathway uses more energy than the C3 pathway. The C3 pathway requires 18 molecules of ATP for the synthesis of one molecule of glucose, whereas the C4 pathway requires 30 molecules of ATP. This energy debt of more 12 ATPs is more than paid for by avoiding losing more than half of photosynthetic carbon in photorespiration as occurs in some tropical plants,making it an adaptive mechanism for minimising the loss.
So, the correct answer is option D.
Suggest Corrections
0
Similar questions
View More
Join BYJU'S Learning Program
Explore more
Join BYJU'S Learning Program
