Tag: control and co-ordination in plants and animals

Questions Related to control and co-ordination in plants and animals

The nervous system uses .............. to transmit messages.

biology control and co-ordination in plants and animals voluntary and involuntary movements impulse and its transmission coordination in human beings- nervous control

  1. Chemical impulses

  2. Electrical impulses

  3. Mechanical impulses

  4. All of the above

Show answer
Correct Option: B
Explanation:

The nervous system uses electrical impulses to transmit messages. Neurons conduct electrical impulses by generating the action potential. Action potential is generated through the flow of positively charged ions across the neuronal membrane.

An axon terminal passes the electrical stimulus to a dendrite of next neuron through .............. reaction.

biology control and co-ordination in plants and animals voluntary and involuntary movements impulse and its transmission coordination in human beings- nervous control

  1. Chemical

  2. Electrical

  3. Mechanical

  4. None of the above

Show answer
Correct Option: A
Explanation:

A nerve impulse travels in a form of electrical charge from a neuronal axon end to the synapse. Here, the electrical impulse is converted to the chemical impulse in the synaptic cleft. Further, this nerve impulse flows from synaptic cleft to dendritic tips, converting the chemical impulse to electrical impulse. The neurotransmitters required is synthesised only by axon terminals and the receptors required to detect these chemical transmitters are only present on the dendritic ends. Thus, the impulse always flows from one axonal end of a neuron to another dendron head of a neuron. 

So, the correct answer is option A.

A nerve impulse leaves a neuron via the

biology control and co-ordination in plants and animals voluntary and involuntary movements impulse and its transmission coordination in human beings- nervous control

  1. Dendrites

  2. Cyton

  3. Axon

  4. Nucleus

Show answer
Correct Option: C
Explanation:

Dendrites are the small extension of nerve cells that receives signals from sensory receptors or other neurons.

The long extension of the cell body of the nerve cell is called as axon that serves to conduct the nerve impulse away from the cell body. 
Cyton /soma is the metabolic center of the nerve cell where the metabolic contents are manufactured. It is not involved in nerve impulse conduction. The nucleus is present in the soma. 
Therefore, the correct answer is option C.

There are certain special nerves which are insulated by myelin sheaths around them. The nerve impulse travels very fast along these nerves because it "leaps" along certain special points on these nerves. What is this special mode of conduction known as?

biology control and co-ordination in plants and animals voluntary and involuntary movements impulse and its transmission coordination in human beings- nervous control

  1. Superconduction

  2. Saltatory conduction

  3. Ultrasonic conduction

  4. Hyperconduction

Show answer
Correct Option: B
Explanation:

Saltatory conduction is the propagation of action potentials along myelinated axons from one node of Ranvier to the next node, increasing the conduction velocity of action potentials.

So, the correct option is 'Saltatory conduction'.

Identify the correct match from the column I, II & III:-

Column-I Column-II Column-II
1) Dendron a) Myelinogesis i) transduction
2) Cell body b) Receptor ii) P.N.S
3) Myelinated Axon c) Grey matter iii) Information co-ordination
4) Schwann cell d) White matter iv) Fast conduction
biology control and co-ordination in plants and animals voluntary and involuntary movements impulse and its transmission coordination in human beings- nervous control

  1. $1-b-i, \quad 2-c-iii, \quad 3-d-ii, \quad 4-a-iv$

  2. $1-b-i, \quad 2-c-iii, \quad 3-d-iv, \quad 4-a-ii$

  3. $1-a-i, \quad 2-d-iv, \quad 3-c-iii, \quad 4-b-ii$

  4. $1-d-iv, \quad 2-a-i, \quad 3 - c-ii, \quad 4-b-iii$

Show answer
Correct Option: B
Explanation:

The correct match can be represented as-

   Column-I    Column-II    Column-III
 1)  Dendron  b)  Receptor I)  transduction 
 2)  Cell body  c)  Grey matter iii)   information co-ordinator
 3)  Myelinated Axon d)   White matter iv)  fast - conduction
 4)  Schwann cell  a)  Myelinogenesis  ii)  P.N.S.

So, the correct option is '1-b-i, 2-c-iii, 3-d-iv, 4-a-ii'.

When the person is alert, with open eyes and actively trying to solve some complex problem, the EEG shows ............ waves.

biology control and co-ordination in plants and animals voluntary and involuntary movements impulse and its transmission coordination in human beings- nervous control

  1. Alpha

  2. Beta

  3. Delta

  4. Gamma

Show answer
Correct Option: B
Explanation:

An electroencephalogram (EEG) is a test, that measures and records the electrical activity of the brain. Beta waves have a frequency of 13 to 30 cycles per second. These waves are normally found, when person is alert or have taken high doses of certain medicines, such as benzodiazepines.

When the direction of nerve impulse is reversed, the condition is

biology control and co-ordination in plants and animals voluntary and involuntary movements impulse and its transmission coordination in human beings- nervous control

  1. Axo - Axonic synapse

  2. Axo - Dendritic synapse

  3. Both of the above

  4. None of the above

Show answer
Correct Option: A
Explanation:

There are different forms of synapse depending on the position of the synapse. When the synapse occurs in the axon, the synapse is known as the axoaxonic synapse. The nerve impulse conduction takes place from one axon to the other axon. The nerve impulse is transferred from the axon of one neuron to the axon of the other neuron. In this process, the direction of nerve impulse is reversed from axon to dendron to the axon to axon. 

Thus,l the correct answer is option A. 

Waves emitted in brain during deep sleep is

biology control and co-ordination in plants and animals voluntary and involuntary movements impulse and its transmission coordination in human beings- nervous control

  1. Alpha

  2. Beta

  3. Delta

  4. Gamma

Show answer
Correct Option: C
Explanation:

A delta wave is a high amplitude brain wave. Delta waves are usually associated with the deep stage 3 of NREM sleep, also known as slow-wave sleep (SWS) and aid in characterizing the depth of sleep.

Which of the following statements about the transmission of the nerve impulse is correct? 
(a) A nerve impulse travels from the dendritic end towards the axonal end.
(b) At the dendritic end, electrical impulses bring about the release of some chemicals which generate an electrical impulse at the axonal end of another neuron.
(c) The chemicals released from the axonal end of one neuron cross the synapse and generate a similar electrical impulse in a dendrite of another neuron.
(d) A neuron transmits electrical impulses not only to another neuron but also to muscle and gland cells.

biology control and co-ordination in plants and animals voluntary and involuntary movements impulse and its transmission coordination in human beings- nervous control

  1. (a) and (c)

  2. (b) and (d)

  3. (a), (c) and (d)

  4. (b), (c) and (d)

Show answer
Correct Option: C
Explanation:

A nerve impulse is a way nerve cells (neurons) communicate with one another. Nerve impulses are mostly electrical signals along the dendrites to produce a nerve impulse or action potential. The action potential is the result of ions moving in and out of the cell.
A nerve impulse travels from the dendritic end towards the axonal end. The chemicals released from the axonal end of one neuron cross the synapse and generate a similar electrical impulse in a dendrite of another neuron. A neuron transmits electrical impulses not only to another neuron but also to muscle and gland cells.

Therefore, the correct answer is option C.

Speed of nerve impulse in mammals is 

biology control and co-ordination in plants and animals voluntary and involuntary movements impulse and its transmission coordination in human beings- nervous control

  1. 1 meter /sec

  2. 100 meter/sec

  3. 1000 meter /sec

  4. None of the above

Show answer
Correct Option: B
Explanation:

Nerve impulses are conducted with great velocity. In mammalian nerve, the speed of conduction may be as high as 100 meters per second.