The correct sequence of different phases of cell cycle is

• S - G₁ - G₂ - M

• G₁ - S - G₂ - M

• G₂ - S - G₁ - M

• G₁ - G₂ - S - M

Animals are classified into hierarchical groups in which one of the following, the largest number of species is found?

• Genus

• Order

• Family

• Cohort

The blood vessel which supply oxygenated blood to cardiac tissue is

• coronary artery

• coronary vein

• coronary sinus

• pulmonary vein

Vegus nerve is a

• mixed X cranial nerve

• mixed XI cranial nerve 

• mixed X thoracic nerve

• sensory X cranial nerve

The number of spinal nerves in human is

• 10 pairs

• 12 pairs

• 43 pairs

• 31 pairs

Third and fourth ventricles of the brain are connected by

• aqueduct of Sylvious

• foramen of Monro

• foramen of Magnum

• corpus callosum

All or none law is not applicable for

• whole skeletal muscle

• single skeletal muscle fibre

• whole cardiac muscle

• single smooth muscle fibre

Numerical aperture of microscope lens is expressed by

• angular aperture only

• refractive index only

• both angular aperture and refrative index

• wave length of the light used

Which one of the following is not true for enzymes?

• They act on a specific substrate

• They are made up of fat and sugar

• They act at a specific temperature

• They act at a specific pH

Living. cells placed in isotonic solution (0.9% saline) retain their size and shape. This is based on the concept of

• osmosis

• diffusion

• facilitated diffusion

• transpiration