Tag: biology

Questions Related to biology

Name the part of neuron through which information travels as an electrical impulses.

biology plant and animal tissues nervous system in animals structure of neuron structure and function of neuron

  1. Dendrites

  2. Axon

  3. Schwann cells

  4. Sypase

Show answer
Correct Option: B
Explanation:
An axon is a long, slender projection of a neuron, that typically conducts electrical impulses away from the neuron's cell body in form of a wave of depolarization. The function of the axon is to transmit information to different neurons, muscles and glands.
So, the correct option is 'Axon'.

Centrosome includes a pair of centrioles that help in cell division by spindle formation. The non-dividing cells in human are

biology plant and animal tissues nervous system in animals structure of neuron structure and function of neuron

  1. Chondrocytes

  2. Epithelial cells

  3. Neurons

  4. Neuroglial cells

Show answer
Correct Option: C
Explanation:
A. Chondrocytes are the cells that are found in cartilage. These cells can divide forming a nest of 2-4 cells.
B. Epithelial cells are the cells lining the surfaces of the body. These cells can also divide by mitosis.
C. Neurons or the nerve cells are the largest cells in the body and found in the nervous system. These cells do not have centrioles and hence, do not undergo cell division.
D. Neuroglial cells are the cells in the central nervous system, other than neurons. These cells are meant for the protection of neurons and can divide by mitosis.
Hence, non-dividing cells in humans are neurons.

So, the correct answer is 'Neurons'.

Neurilemma is name for :

biology plant and animal tissues nervous system in animals structure of neuron structure and function of neuron

  1. Plasmamembrane of axon

  2. Coating formed by myelin sheath

  3. Covering of schwann cells

  4. Connective tissue covering of nerve fasciculus

Show answer
Correct Option: C
Explanation:

Neurilemma is the outermost covering of Schwann cells that surrounds the axon of the neuron. It is also known as neurolemma.

Thus, the correct answer is 'Covering formed by Schwann cells.'

Which one of the following pairs of structures distinguishes a nerve cell from other cell types?

biology plant and animal tissues nervous system in animals structure of neuron structure and function of neuron

  1. Vacuoles and fibres

  2. Flagellum and medullary sheath

  3. Nucleus and mitochondria

  4. Perikaryon and dendrites

Show answer
Correct Option: D
Explanation:

The vacuole is membrane bound organelle present in all plant and fungal cells and some protist, animal and bacterial cells. The flagellum is an appendage, that protrudes from the cell body of certain prokaryotic and some eukaryotic cells. Nucleus and mitochondria are membrane bound organelles present in almost all cells. Perikaryon, also called cyton is the bulbous end of a neuron containing cell nucleus. Dendrites are the short cytoplasmic processes of the cell body of the neuron, which receives stimulus from other neurons. 
So, the correct answer is option D.

In peripheral nervous system, the nerves are made up exclusively from the

biology plant and animal tissues nervous system in animals structure of neuron structure and function of neuron

  1. Dendrons

  2. Axons

  3. Nodes of Ranvier

  4. Nissl body

Show answer
Correct Option: B
Explanation:

Nerves are made up of bundles of the axons of nerve cells. A nerve is an enclosed, cable-like bundle of axons (long, slender projections of neurons) in the peripheral nervous system.

'Nodes of Ranvier' are found in 

biology plant and animal tissues nervous system in animals structure of neuron structure and function of neuron

  1. Brain

  2. Heart

  3. Axon

  4. Eye

Show answer
Correct Option: C
Explanation:

Nodes of Ranvier are periodic gaps in the insulating sheath (myelin) on the axon of certain neurons, that serves to facilitate the rapid conduction of nerve impulses. 

The action potential propagated by one node of Ranvier jumps to and is regenerated at the next node along the axon, thereby enabling the action potential to travel rapidly along the fiber.

The function of an axon is 

biology plant and animal tissues nervous system in animals structure of neuron structure and function of neuron

  1. Transformation of nerve impulse

  2. Reception of stimuli from neurons

  3. Reception of external stimuli

  4. Conduction of nerve impulse

Show answer
Correct Option: D
Explanation:

An axon is also known as a nerve fiber. It is a long, slender projection of a nerve cell, or neuron, that conducts electrical impulses away from the neuron's cell body. The function of the axon is to transmit information to different neurons, muscles and glands.

Sheath of Schwann occurs on 

biology plant and animal tissues nervous system in animals structure of neuron structure and function of neuron

  1. Neurons

  2. Axons

  3. Dendrons

  4. Neuroglia

Show answer
Correct Option: B
Explanation:

Schwann cells also called as neurolemmocytes are the principal glia of the peripheral nervous system (PNS). Myelinating Schwann cells wrap around axons of motor and sensory neurons to form the myelin sheath. 

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

biology plant and animal tissues nervous system in animals structure of neuron structure and function of neuron

  1. Cell metabolites

  2. Fat granules

  3. Ribosomes

  4. Mitochondria

Show answer
Correct Option: C
Explanation:

A Nissl granule is a large granular body found in neurons. These granules are rough endoplasmic reticulum (RER) with rosettes of free ribosomes and are the site of protein synthesis.

Dendrites are associated with which system?

biology plant and animal tissues nervous system in animals structure of neuron structure and function of neuron

  1. Nervous system

  2. Digestive system

  3. Muscular system

  4. Blood vascular system

Show answer
Correct Option: A
Explanation:

Dendrites are the branched projections of a neuron, that act to propagate the electrochemical stimulation received from other neural cells to the cell body, or soma, of the neuron from which the dendrites project.