Best defined function of manganese in green plants is
Photolysis of water
Calvin cycle
Nitrogen fixation
Nitrogen fixation
A.
Photolysis of water
Photolysis of water requires light energy, an Oxygen-Evolving Complex (OEC) and electron carrier 1/2. OEC complex was formerly called Z-enzyme. It has four Mn ions. Light energy brings about changes in Mn (Mn+2, Mn3+, Mn+4) which helps in removing electrons from OH- component of water forming oxygen. Liberation of oxygen also requires Cl- and Ca+2.
Which part of the human ear plays no role in hearing as such but is otherwise very much required?
Eustachian tube
Organ of corti
Vestibular apparatus
Vestibular apparatus
Pheretima and its close relatives derive nourishment from
sugarcane roots
decaying fallen leaves and soil organic matter
soil insects
soil insects
The most abundant prokaryotes helpful to humans in making curd from milk and in production of antibiotics are the ones categorised as
Cyanobacteria
Archaebactera
Chemosynthetic autotrophs
Chemosynthetic autotrophs
Companion cells are closely associated with
sieve elements
vessel elements
trichomes
trichomes
Consumption of which one of the following foods can prevent the kind of blindness associated with vitamin ‘A’ deficiency?
‘Flaver Savr’ tomato
Canolla
Golden rice
Golden rice
A process that makes important difference between C3 and C4 plants is
transpiration
glycolysis
photosynthesis
photosynthesis
A certain road accident patient with unknown blood group needs immediate blood transfusion. His one doctor friend at once offers his blood. What was the blood group of the donor
Blood group B
Blood group AB
Blood group O
Blood group O
The maximum amount of electrolytes and water (70-80 percent from the glomerular filtrate is reabsorbed in which part of the nephron?
Ascending limb of loop of Henle
Distal convoluted tubule
Proximal convoluted tubule
Proximal convoluted tubule
The human hind brain comprises three parts, one of which is
spinal cord
corpus callosum
Cerebellum
Cerebellum
