cells . It takes place in all living cells . It takes place only in the presence of light . It takes place all the time .
It involves chloroplast, peroxisome and mitochondria . It involves only mitochondria . It does not involve Glycolysis, Kreb’s Cycle, and ETS . It involves glycolysis, Kreb’s Cycle and ETS .
Substrate is glycolic acid . Substrate is carbohydrates, protein or fats . It is not essential for survival . Essential for survival .
No phosphorylation and yield of ATP . Phosphorylation produces ATP energy . NADH is oxidised to NAD . NAD is reduced to NADH .
Hydrogen peroxide is produced . Hydrogen peroxide is not produced . End products are CO and PGA . End products are CO and water ( ) Ribulose , bis phosphate ( ) Phospho Glycolate ( ) Glycolate ( ) Glycolate ( ) Glyoxylate ( ) Glycine ( ) Glycine Serine Serine Hydroxy pyruvate Glycerate PGA Glycerate + NAD NADH+H CO NH ADP ATP ( ) Pi ( ) O2 O2 H O H O + ½ O Calvin Cycle P E R O X I S O M E M I T O C HO N D R I O N 5C 2C 2C 2C 2C 3C 3C 3C 3C 3C 3C 2C 2C ( ) PGA + + Figure .
: Photorespiration a. Intensity of Light: Intensity of light plays a direct role in the rate of photosynthesis. Under low intensity the photosynthetic rate is low and at higher intensity photosynthetic rate is higher. It also depends on the nature of plants.
Heliophytes (Bean Plant) require higher intensity than Sciophytes ( Oxalis ). b. Quantity of Light: In plants which are exposed to light for longer duration (Long day Plants) photosynthetic rate is higher. c.
Quality of light: Different wavelengths of light affect the rate of photosynthesis because pigment system does not absorb all the rays equally. Photosynthetic rate is maximum in blue and red light. Photosynthetically Active Radiation (PAR) is between to nm. Red light