Companion cells are closely associated with
sieve elements
vessel elements
trichomes
trichomes
A.
sieve elements
Companion cells are characteristic elements of phloem tissue associated with the sieve tubes(sieve elements) in the angiosperms. The siever tubes and companion cells are related ontogenically as they develop from the same mother cell. The companion cells and sieve tubes maintain close cytoplasmic connections through plasmodesmata.
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
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
