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Neural Control and Coordination · Question 56

AIPMT 2001MCQEasy📈 Topic in 12% papers+4−1
1

When we migrate from dark to light, we fail to see for some time but after a time visibility becomes normal. It is an example of

  1. accommodation
  2. adaptation
  3. mutation
  4. photoperiodism

Answer

(2) adaptation

Solution

On moving from dark to bright light, the eye is at first dazzled; then the pupil constricts and the photopigments of rods are bleached, so the retina adjusts to the higher light intensity and vision becomes normal (light adaptation).

Accommodation is the change of focal length of the lens for near and far objects, so it is not involved here.

∴ It is an example of adaptation.

Answer: (2)

Out of syllabusAIPMT 2001

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2

Which of the following statements is the characteristic of human cornea?

  1. It is secreted by conjunctiva and glandular layer.
  2. It is a lacrimal gland which secretes tears.
  3. Blood circulation is absent in cornea.
  4. In old age it becomes the cause of cataract.
Out of syllabusAIPMT 2001
3

Depolarization of axolemma during nerve conduction takes place because of

  1. equal amount of Na+ and K+ move out across axolemma
  2. Na+ move inside and K+ move more outside
  3. more Na+ outside
  4. none of these
AIPMT 2000
4

Which food should be eaten during deficiency of rhodopsin in eyes?

  1. Carrot and ripe papayas
  2. Guava, banana
  3. Mango and potato
  4. None of the above
Out of syllabusAIPMT 2000

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