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The focal length of the lens in eye is controlled by

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Important Questions on Control and Co-ordination

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Biology>Human Physiology>Control and Co-ordination>Sensory Perception and Receptors
In the mammalian eye, the 'fovea' is the the center of the visual field, where:
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Biology>Human Physiology>Control and Co-ordination>Sensory Perception and Receptors

Write one function of Sclera of the human eyeball.

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Biology>Human Physiology>Control and Co-ordination>Sensory Perception and Receptors
The photosensitive compound in the human eye is made up of:
HARD
Biology>Human Physiology>Control and Co-ordination>Sensory Perception and Receptors
Which of the following statement is correct?
(i) The rods contain a purplish-red protein called the rhodopsin.
(ii) The photopigments are embedded in the membrane discs of the inner segment.
(iii) Retinal is a derivative of vitamin A.
(iv) Light induces dissociation of the retinal from opsin resulting in changes in the structure of the opsin.
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Biology>Human Physiology>Control and Co-ordination>Sensory Perception and Receptors

Which statement is CORRECT regarding blind spot in human eye?

It ___________.

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Biology>Human Physiology>Control and Co-ordination>Sensory Perception and Receptors
Short sightedness in humans can be corrected by using:
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Biology>Human Physiology>Control and Co-ordination>Sensory Perception and Receptors
The transparent lens in the human eye is held in its place by
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Biology>Human Physiology>Control and Co-ordination>Sensory Perception and Receptors

Consider the following vision defects listed in Columns I and II and the corrective measures in Column III. Choose the correct combination.

   Column I    Column II    Column III
 P.  Hypermetropia  (i)  Near-sightedness  a.  Convex lens
 Q.  Myopia  (ii)  Far-sightedness  b.  Concave lens
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Biology>Human Physiology>Control and Co-ordination>Sensory Perception and Receptors
Match List I with List II: 

List I

List II
A. Fovea I.  Visible coloured portion of eye that regulates diameter of pupil.
B. Iris II.  External layer of eye formed of dense connective tissue.
C. Blind spot III. Point of greatest visual acuity or resolution.
D. Sclera IV. Point where optic nerve leaves the eyeball and photoreceptor cells are absent

Choose the correct answer from the options given below: 

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Biology>Human Physiology>Control and Co-ordination>Sensory Perception and Receptors
Explain the mechanism of hearing.
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Biology>Human Physiology>Control and Co-ordination>Sensory Perception and Receptors
Which one of the following statements is not correct?
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Biology>Human Physiology>Control and Co-ordination>Sensory Perception and Receptors

Match the following columns and select the correct option.

  Column-I   Column-II
(a) Organ of Corti (i) Connects middle ear and pharynx
(b) Cochlea (ii) Coiled part of the labyrinth
(c) Eustachian tube (iii) Attached to the oval window
(d) Stapes (iv) Located on the basilar membrane
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Biology>Human Physiology>Control and Co-ordination>Sensory Perception and Receptors

Match the following columns and select the correct option:-

Column-I column-II
(a) Rods and cones (i) Absence of photoreceptor cells
(b) Blind spot (ii) Cones are densely packed
(c) Fovea (iii) Photoreceptor cells
(d) Iris (iv) Visible coloured portion of the eye
HARD
Biology>Human Physiology>Control and Co-ordination>Sensory Perception and Receptors
Choose the correct statements.
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Biology>Human Physiology>Control and Co-ordination>Sensory Perception and Receptors
Which one of the following parts of the eye is affected in cataract?
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Biology>Human Physiology>Control and Co-ordination>Sensory Perception and Receptors
Scientists find a gene P that helps human peripheral neurons to sense temperature less than 13°C and induce a physiological signal of avoidance. This gene is present in almost all vertebrates. Considering that gene P has role only in detection of low temperature, the correct statement(s) is(are)
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Biology>Human Physiology>Control and Co-ordination>Sensory Perception and Receptors
When one goes from a brightly lit area to a dimly lit room our eyes adjusts slowly, thereby regaining the clarity of vision. Which ONE of the following explains this process?
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Biology>Human Physiology>Control and Co-ordination>Sensory Perception and Receptors
Write any two diseases/defects of the ear.
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Biology>Human Physiology>Control and Co-ordination>Sensory Perception and Receptors
In a blind spot of the human eye
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Biology>Human Physiology>Control and Co-ordination>Sensory Perception and Receptors
Which of the following statements is correct?