The human hind brain comprises three parts, one of which is

• spinal cord

• corpus callosum

• Cerebellum

• Cerebellum

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

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

Pheretima and its close relatives derive nourishment from

• sugarcane roots

• decaying fallen leaves and soil organic matter

• soil insects

• soil insects

A process that makes important difference between C₃ and C₄ plants is

• transpiration

• glycolysis

• photosynthesis

• photosynthesis

Best defined function of manganese in green plants is

• Photolysis of water

• Calvin cycle

• Nitrogen fixation

• Nitrogen fixation

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

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

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