There are about 90 million rod cells in the human retina, and each contains about 4x107 molecules of rhodopsin that are very densely packed in the membrane disks.

TLS Online TPP Program

#Id: 9230

#Unit 6. System Physiology – Plant

C4 and CAM plants have evolved to limit photorespiration by concentrating CO2 at the site of carbon fixation.

The deleterious impact of photorespiration evolved C4 and CAM plants

TLS Online TPP Program

#Id: 9231

#Unit 6. System Physiology – Plant

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.