The highest concentrations of free auxin in the living plant are in the apical meristems of shoots and in young leaves because these are the primary sites of auxin synthesis. 

TLS Online TPP Program

#Id: 9232

#Unit 6. System Physiology – Plant

In photosynthesis, the relationship of O2 evolved to CO2 taken up is 1:1. 

In photorespiration, 3 O2 are taken up for every CO2 evolved.

TLS Online TPP Program

#Id: 9233

#Unit 6. System Physiology – Plant

Photorespiration stimulates nitrate assimilation in C3 plant roots, probably by increasing NADH availability in the cytosol.

Photorespiration is positively correlated with growth under nitrogen limitation

TLS Online TPP Program

#Id: 9234

#Unit 6. System Physiology – Plant

Photorespiration enhances C3 plant tolerance to drought, salinity and chilling.

TLS Online TPP Program

#Id: 9235

#Unit 6. System Physiology – Plant

The C4 pathway, involving mesophyll cells and bundle-sheath cells, predominates in plants of tropical origin. 

TLS Online TPP Program

#Id: 9236

#Unit 6. System Physiology – Plant

TLS Online TPP Program

#Id: 9237

#Unit 6. System Physiology – Plant

Mesophyll cell (peripheral region)= Primary carboxylation and regeneration

Bundle sheath cell (internal region)= Decarboxylation and Secondary carboxylation