Axon can not have

  • Synaptic knob with synaptic vesicles

  • Distal end is branched

  • Synaptic vesicles have chemicals called neurotransmitters

  • Nissl's Granules

Multipolar neurons are

  • One axon and two or more dendrites

  • One dendrites and two or more axon

  • Multiple dendrites and no axon

  • No dendrites and multiple axon

Bipolar neuron means

  • With one axon and one dendrite

  • With two dendrite and no axon

  • With one axon and two dendrites

  • With no dendrite and two axons

Unipolar neuron means

  • Cell body with one axon only

  • Cell body with dendrite only

  • Only cell body

  • An axon and dendrite with a cell body

Which of the following is found usually in the embryonic stage?

  • Unipolar

  • Bipolar

  • Multipolar

  • Both B and C

The gaps between two adjacent myelin sheath are called

  • Nodes of Ranvier

  • Axon terminal

  • Synaptic knob

  • Schwan cell

In retina of eye which kind of axons are found?

  • Multipolar

  • Bipolar

  • Unipolar

  • Apolar

Unmyelinated nerve fibres are enclosed by

  • Schwann cells

  • Myelin sheath

  • No shwann cells and myelin sheath

  • Schwann cells but not myelin sheath

Unmyelinated nerve fibres are found in

  • Autonomous

  • Somatic Neural systems

  • Both A and B

  • CNS

Myelinated nerve fibres are found in

  • Cranial nerves

  • Spinal nerves

  • Both A and B

  • Not in CNS

Neurons are excitable cells because

  • Their membranes are in unpolarized state

  • There membranes are very light to create channels

  • They have got neurotransmitters

  • Their membranes are in polarized state

The membrane of neuron is polarized because

  • Different kind of lipids are there over membrane

  • Different kinds of ion channels are there in membrane

  • These ion channels are selectively permeable to different ions

  • Both B and C

When neuron is resting, which of the following is false with respect to that

  • It is not conducting any impulse

  • Axonal membrane is more permeable to potassium ions

  • Axonal membrane won't allow any flow of sodium ions across it

  • Membrane is impermeable to negatively charged proteins

Which of the following conditions are not true across resting membrane?

  • Axoplasm has more number of Potassium ions

  • Axoplasm has less number of sodium ions

  • High Concentration of negatively charged proteins in fluid outside axoplasm

  • Both B and C

Ionic gradients across the resting membrane are maintained by

  • Active transport of ions

  • RMP

  • Impulse or stimulus

  • Both A and B

Sodium potassium pump in neuronal membranes is

  • Responsible for transfer of 3 sodium outwards and two potassium inwards

  • Responsible for 2 sodium outwards and three potassium inwards

  • Responsible for 2 sodium and three potassium inwards

  • Responsible for 2 sodium and three potassium outwards

At Resting condition, the neuron membrane is

  • Negative from outside

  • Negative from inside

  • Positive from inside

  • Both A and C

The………. Difference across the resting membrane is called as Resting potential.

  • Electrochemical potential

  • Elecrical potential

  • Chemical

  • Chemiosmotic

When a stimulus is applied at a site over neuron membrane

  • It becomes freely permeable to Sodium ions

  • It becomes freely permeable to potassium ions

  • It causes reversal of polarity from positive to negative on inner side

  • Both A and C

The polarity of the membrane at site A is reversed ie inside of the membrane becomes changed from negative to positive

  • Called as depolarization

  • Called as repolarization

  • Called as polarization

  • Called as hyperpolarization

The ................ across the plasma membrane at site A is called ............, which is termed as ........

  • Resting membrane potential, action potential, nerve impulse

  • Electric potential difference, action potential, nerve impulse

  • Resting membrane potential, nerve impulse, action potential

  • Action potential, electric potential difference, active potential

In a neuron if stimulus is given at point A then in which direction current flows?

  • From site A to site B on innerside

  • From site A to site B on outerside

  • From site B to site A on outerside

  • Both A and C

The rise in stimulus-induced permeability to
a. Potassium ions
b. Sodium ions
c. Restoring RMP
d. Diffusion of potassium ions

Arrange them in order.

  • b-a-c-d

  • a-b-c-d

  • b-a-d-c

  • c-a-d-b

Nerve impulse is transmitted from one neuron to another neuron by the means of

  • Synapse

  • Junction

  • Both A and B

  • Current only

Which of the following has not to be there in a synapse?

  • Pre synaptic neuron

  • Post synaptic neuron

  • Synaptic cleft

  • None of these

Which of the following is not associated with electrical synapse?

  • No synaptic cleft

  • Pre synaptic membranes and post synaptic membranes are in close association with each other

  • Electric current flow directly from one neuron to other neuron through synapse

  • Very common synapse in our system

Transmission of an impulse across electrical synapses

  • Is very different to impulse conduction along a single axon

  • Is very similar to impulse conduction along a single axon

  • Is same as that of chemical synapse

  • Both A and C

Which of the following is not associated with Impulse transmission across an electrical synapse?

  • Faster than chemical synapse

  • Rare in our system

  • No synaptic cleft

  • Impulse transmission is not similar as that of transmission within a neuron

Synaptic cleft is not

  • Separated by pre synaptic and post synaptic neurons

  • a fluid filled space

  • A part of synapse

  • Present in all synapses

Which of the following is not associated with chemical synapse?

  • Slower than electrical synapse

  • Synaptic cleft

  • Release of neurotransmitter

  • Transmission is similar as that of nerve impulse within an axon

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Practice Zoology Quiz Questions and Answers