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Neural Control and Coordination · Question 54

AIPMT 2003MCQEasy📈 Topic in 25% papers+4−1
1

What used to be described as Nissl's granules in a nerve cell are now identified as

  1. cell metabolites
  2. fat granules
  3. ribosomes
  4. mitochondria.

Answer

(3) ribosomes

Solution

As per NCERT, the cell body of a neuron contains cytoplasm with typical cell organelles and certain granular bodies called Nissl's granules.

⇒ Under the electron microscope these granules are clusters of rough endoplasmic reticulum and free ribosomes (rich in RNA), which carry out protein synthesis.

∴ Nissl's granules are identified as ribosomes.

Answer: (3)

AIPMT 2003

Keep practising — Neural Control and Coordination

2

Which of the following statements is correct for node of Ranvier of nerve?

  1. Neurilemma is discontinuous
  2. Myelin sheath is discontinuous
  3. Both neurilemma and myelin sheath are discontinuous
  4. Covered by myelin sheath
AIPMT 2002
3

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
Out of syllabusAIPMT 2001
4

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
5

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
6

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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