Parts A, B, C and D of the human eye are shown in the diagram. Select the option which gives correct identification along with its functions/characteristics
1. B - Blind spots - has only a few rods and cones.
2. C- Aqueous chamber - reflects the light which does not pass through the lens.
3. D- Choroid - its anterior part forms ciliary body.
4. A - retina - contains photo receptors - rods and cones.
In which of the following part of the brain, the nerve impulses of sound are analyzed?
1. Visual cortex area
2. Olfactory cortex area
3. Auditory cortex area
4. Tactile cortex area
Vestibular apparatus is composed of:
I. Semi-circular canals
II. Otolith organs
III. Organ of Corti
IV. Crista and macula
1. I, II, III & IV
2. I, II only
3. IV only
4. II only
Which of the following is the incorrect difference between rods and cones?
Rods |
Cones |
|
1. |
Contain rhodopsin visual purple pigment |
Contain iodopsin visual violet pigment |
2. |
Enable us to see black and white |
Respond to red, green, and blue lights |
3. |
Concentrated in the centre of the retina |
Evenly distributed all over retina |
4. |
Twilight vision |
Daylight/Photopic vision |
The transduction of sound waves to action potentials takes place:
1. Within the tectorial membrane as it is stimulated by the hair cells.
2. When hair cells are bent against the tectorial membrane causing them to depolarize and release neurotransmitter molecule that stimulates sensory neurons.
3. As the basilar membrane becomes more permeable to sodium ions and depolarizes, initiating an action potential in sensory neurons.
4. Within the middle ear as the vibration is amplified by the malleus, incus, and stapes.
For the given diagram which labeling and function is
correctly matched/described?
1. (a) Fovea Rods are densely packed.
2. (b) Blindspot No image formed.
3. (c) Choroid Coloured part of the eye which regulates diameter of pupil.
4. (d) Ciliary body No role in accommodation
Which of the following is not a part of the autonomic neural system?
1. Brain
2. Spinal cord
3. Ganglion
4. Skeletal Muscle
The ___________ integrates information received from the semicircular canals of the ear and the auditory system.
1. Cerebrum.
2. Cerebellum.
3. Medulla oblongata.
4. Thalamus.
How many of these contain sensory hair cells?
Eustechian tube, utricle, saccule, Semicircular
canals, scale media, scala vestibuli
1. 1
2. 3
3. 4
4. 2
Which of the following statements is not correct?
1. | An action potential in an axon does not move backward because the segment behind is in a refractory phase. |
2. | Depolarization of hair cells of cochlea results in the opening of the mechanically gated Potassium- ion channels. |
3. | Rods are very sensitive and contribute to daylight vision. |
4. | In the knee-jerk reflex, stimulus is the stretching of muscle and response is its contraction. |