Most of the neurons in the cerebral cortex are:

  • Unipolar

  • Bipolar

  • Multipolar

  • Pseudo unipolar

The number of correct statements amongst the given statements is:

I. Somatic neural system relays impulses from the CNS to smooth muscles of the body.

II. Myelinated nerve fibers are found in spinal nerves but not in cranial nerves.

III. Sodium-potassium pump transports 3 sodium outwards and 2 potassium into the cell.

IV. Electrical synapses are rare in our system.

V. Efferent neurons carry signals from the CNS to the effector.

  •      2         

  •      3

  •      4         

  •      5

In the given diagram of cochlea, the tectorial membrane is represented by the letter:

                       

  •               A                   

  •               B

  •               C                 

  •               D

Mark the incorrect match?

 1. Cerebral aqueduct→ A canal passes through the midbrain, connecting 3rd ventricle to 4th ventricle of brain.
 2. Corpus callosum → Thick band of nerve fibres that divides the cerebral cortex lobes into left and right hemisphere.
 3. Limbic system → The inner part of forebrain involved in the regulation of sexual behaviour.
 4. Pons→ Consist of fibre tracts that interconnect different regions of the brain.

 
  • 1
  • 2
  • 3
  • 4

Vestibular apparatus is a composed of

I.   Semi-circular canals.

II.  Otolith organs.

III. Organ of Corti.

IV. Crista and macula.

  •   I, II, III & IV

  •   I, II only

  •   IV only

  •   II only

'Retinal' is present in

  •   Rods

  •   Cones

  •   Both 1 and 2

  •   All the retinal layer

The resting axonal membrane of a neuron:

  •   is not polarized

  •   has excess of anions on the outside

  •   is more permeable to potassium ions than to sodium ions

  •   cannot be excited by a stimulus

The specific receptor organ in the otolith organ of the internal ear are called as:

  •   Macula

  •   Crista

  •   Cupula

  •   Organ of Corti

In cochlea, the auditory receptors are:

  • Organ of Corti

  • Ampulla

  • Macula

  • Hair cells

Consider the characters of a certain part of the human brain:
I. It contains neurosecretory cells.
II. It is an important part of the limbic system.
III. It is a part of the diencephalons.

This part of the human brain is:

  • Hypothalamus

  • Medulla oblongata

  • Cerebellum

  • Amygdala

Consider the following statements.

                   

(a) Occurs involuntarily and without conscious effort.
(b) At least no afferent and two efferent neuron required.
(c) Only motor neuron is involved in the action.
(d) Polysynaptic and conditional reflex.
(e) Regulated by the spinal cord.

Which of the above statements are correct for the reflex shown in the above figure?

  •   a and e

  •   b, c and d

  •   a, b, d and e

  •   a, b, c, d and e

Myelin sheath is produced by:

  • Astrocytes and Schwann cells

  • Oligodendrocytes and Osteoclasts

  •  Osteoclasts and Astrocytes

  •  Schwann cells and Oligodendrocytes

Nissl bodies are mainly composed of
  • Proteins and lipids
  • DNA and RNA
  • Nucleic acids and SER
  • Free ribosomes and RER
Which of the following structures or regions is incorrectly paired with its function ?
  • Medulla oblongata: controls respiration and cardiovascular reflexes.
  •  Limbic system: consists of fibre tracts that interconnect different regions of brain; controls movement.
  • Hypothalamus: production of releasing hormones and regulation of temperature, hunger and Thirst.
  • Corpus callosum: band of fibers connecting left and right cerebral hemispheres.
The transparent lens in the human eye is held in its place by

 
Photosensitive compound in human eye is made up of

 

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

Which of the following regions of the brain is incorrectly paired with its function

A gymnast is able to balance his body upside down even in the total darkness because of

 

How do parasympathetic neural signals affect the working of the heart?

Injury localized to the hypothalamus would most likely disrupt

 

The human hind brain comprises three parts, one of which is

A person entering an empty room suddenly finds a snake right in front on opening the door. Which one of the following is likely to happen in his neurohormonal control system?

A canal called as the cerebral aqueduct passes through the:

The parasympathetic division of the autonomic nervous system is characterized by each of these except which one?

 

Which one of the following is the correct difference between rod cells and cone cells of our retina? 

During the transmission of nerve impulse through a nerve fibre, the potential on the inner side of the plasma membrane has which type of electric charge ?

Assertion: Neural signals through the parasympathetic nerves can increase the cardiac output.

Reason: Parasympathetic neurons stimulation can increase the activities of SA node and strength
             of ventricular contraction.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false

Assertion: Ear is a stato Acoustic organ.

Reason: Ear is related to hearing & balance.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false

An action potential for a given axon is:

0:0:1


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Practice Zoology Quiz Questions and Answers