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Neural Control and Coordination · Question 12

NEET (UG) 2019MCQMedium📈 Topic in 12% papers+4−1
1

Which of the following statements is correct?

  1. Cornea is convex, transparent layer which is highly vascularised
  2. Cornea consists of dense matrix of collagen and is the most sensitive portion of the eye.
  3. Cornea is an external, transparent and protective proteinaceous covering of the eye-ball
  4. Cornea consists of dense connective tissue of elastin and can repair itself.

Answer

(3) Cornea is an external, transparent and protective proteinaceous covering of the eye-ball

Solution

As per NCERT, the outer layer of the eye-ball is the sclera, made of dense connective tissue; its anterior transparent portion is the cornea.

The cornea is avascular (it has no blood vessels), so statement (1) is wrong.

Its connective tissue is mainly collagen (a protein), not elastin, so statement (4) is wrong.

The most sensitive portion of the eye for vision is the fovea of the retina (yellow spot), where cones are densely packed, so statement (2) is not correct.

The cornea is the external, transparent and protective proteinaceous (collagen) covering of the front of the eye-ball.

Answer: (3)

Out of syllabusNEET (UG) 2019

Keep practising — Neural Control and Coordination

2

Nissl's bodies are mainly composed of

  1. free ribosomes and RER
  2. proteins and lipids
  3. DNA and RNA
  4. nucleic acids and SER
NEET 2018
3

Which of the following structures or regions is incorrectly paired with its functions?

  1. Medulla oblongata : Controls respiration and cardiovascular reflexes
  2. Corpus callosum : Band of fibers connecting left and right cerebral hemispheres
  3. Hypothalamus : Production of releasing hormones and regulation of temperature, hunger and thirst
  4. Limbic system : Consists of fibre tracts that interconnect different regions of brain; controls movement
NEET 2018
4

The transparent lens in the human eye is held in its place by

  1. smooth muscles attached to the ciliary body
  2. ligaments attached to the ciliary body
  3. ligaments attached to the iris
  4. smooth muscles attached to the iris
Out of syllabusNEET 2018
5

Myelin sheath is produced by

  1. astrocytes and Schwann cell
  2. oligodendrocytes and osteoclasts
  3. osteoclasts and astrocytes
  4. Schwann cells and oligodendrocytes.
NEET 2017
6

Receptor sites for neurotransmitters are present on

  1. pre-synaptic membrane
  2. tips of axons
  3. post-synaptic membrane
  4. membranes of synaptic vesicles.
NEET 2017
7

Good vision depends on adequate intake of carotene rich food. Select the best option from the following statements.

  1. A, C and D only
  2. A and C only
  3. B, C and D only
  4. A and B only
Out of syllabusNEET 2017
8

Photosensitive compound in human eye is made up of

  1. opsin and retinol
  2. transducin and retinene
  3. guanosine and retinol
  4. opsin and retinal.
Out of syllabusNEET 2016 (Phase 1)
9

Choose the correct statement.

  1. Nociceptors respond to changes in pressure.
  2. Meissner's corpuscles are thermoreceptors.
  3. Photoreceptors in the human eye are depolarised during darkness and become hyperpolarised in response to the light stimulus.
  4. Receptors do not produce graded potentials.
Out of syllabusNEET 2016 (Phase 2)
10

Destruction of the anterior horn cells of the spinal cord would result in loss of

  1. commissural impulses
  2. integrating impulses
  3. sensory impulses
  4. voluntary motor impulses.
AIPMT 2015
11

In mammalian eye, the 'fovea' is the center of the visual field, where

  1. only rods are present
  2. more rods than cones are found
  3. high density of cones occur, but has no rods
  4. the optic nerve leaves the eye.
Out of syllabusAIPMT 2015

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