In the resting state of neurons, diffusion due to concentration gradients, if allowed, would drive:
1. K⁺ into the cell
2. K⁺ and Na⁺ out of the cell
3. Na⁺ out of the cell
4. Na⁺ into the cell

When we move from dark to light, we fail to see for some time but soon visibility becomes normal. It is:
1. Accommodation
2. Photoperiodism
3. Adaptation
4. Mutation

The myelin sheath in the CNS is synthesized by:

(1) Oligodendrocytes

(2) Astrocytess

(3) Schwann cells

(4) Microglia

The brain stem does not include :
1. Mid brain 
2. Medulla oblongata
3. Pons varolii
4. Cerebellum 

Which of the following is a major coordinating center for sensory and motor signaling for the cerebrum?
1. Hypothalamus
2. Thalamus
3. Corpora quadrigemina
4. Amygdala

The sensory neuron enters the spinal cord through:
1. The dorsal root of the spinal nerve
2. The ventral root of the spinal nerve
3. Either dorsal or ventral root depending on the point of origin 
4. Both dorsal and ventral roots of the spinal nerves

From inside to outside the correct order of the following cells in the retina would be:
1. Ganglion cells - Photoreceptor cells - Bipolar cells
2. Ganglion cells - Bipolar cells - Photoreceptor cells
3. Bipolar cells - Photoreceptor cells - Ganglion cells
4. Photoreceptor cells - Ganglion cells - Bipolar cells

In the human eye, the visual acuity is highest at:

(1) Macula lutea

(2) Optic disc

(3) Fovea centralis

(4) Optic chiasma

Reissner's membrane separates
1. Scala vestibuli and Scala media
2. Tympanic cavity and Pharynx
3. Fenestra rotundus and Fenestra ovalis
4. Scala media and Scala tympani

The resting membrane potential is established primarily due to:
1. Sodium-potassium pump
2. Efflux of potassium
3. Influx of sodium
4. Influx of chloride