Tag: control and co-ordination in plants and animals

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

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?

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

  1. First positive, then negative and continue to be negative

  2. First negative, then positive and continue to be positive

  3. First positive, then negative and again back to be positive

  4. First negative, then positive and again back to be negative

Show answer
Correct Option: D
Explanation:

At resting potential (polarized phase), the inside of the plasma membrane is negatively charged ($-70$ mV). As the stimulus reaches, it becomes positively charges ($+45$ mV, depolarized phase). As impulse passes away, it regains its original ionic distribution and again becomes negatively charged.

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?

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

  1. First positive, then negative and continue to be negative

  2. First negative, then positive and continue to be positive

  3. First positive, then negative and again back to positive

  4. First negative, then positive and again back to negative

Show answer
Correct Option: D
Explanation:

During the transmission of nerve impulse through a nerve fibre, the potential on the inner side of the plasma membrane is the First negative, then positive and again back to negative.

So, the correct answer is 'First negative, then positive and again back to negative'.

Myoglobin is present in.

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

  1. all muscle fibres

  2. white muscle fibres

  3. red muscle fibres

  4. none of these

Show answer
Correct Option: A
Explanation:

Myoglobin is present in 'all muscle fibres'.

So th correct answer is all muscle fibres.

Which of the following layers you will find in the body wall of earthworm (from outside to inside)?
biology control and co-ordination in plants and animals voluntary and involuntary movements impulse and its transmission coordination in human beings- nervous control

  1. Non-cellular cuticle, epidermis, circular muscles, longitudinal muscles, coelomic epithelium

  2. Cuticle, epidermis, longitudinal muscles, circular muscles, coelomic epithelium

  3. Non-cellular cuticle, epidermis, coelomic epithelium, circular muscles, longitudinal muscles

  4. Cuticle, epidermis, peritoneal muscles

Show answer
Correct Option: A
Explanation:

Externally the body wall of earthworm is covered by a thin non cellular cuticle below which lies the epidermis two muscle layers (circular and longitudinal) and innermost coelomic  epithelium.

Recently, a new device is innovated which allows brain to bypass spinal cord and can directly send signal to limbs and thus can allow movement of paralysed limbs. What kind of signals the device must be generating which controls these muscles?

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

  1. Thermal signals

  2. Electric signals

  3. Optical signals

  4. Chemical signals

Show answer
Correct Option: B
Explanation:

A new device referred as neurobridge, have been discovered that can by pass the signals from brain to the limbs with the help of electric signals. For the very first time, such device have been developed which helps to reconnect the brain directly to the muscles allowing voluntary and funcutional control of a paralyzed limb. 

A nerve impulse leaves a neuron through 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:

For nerve impulses to be generated and carried, nerve cells should be in contact with each other. The nerve impulse is transmitted in the following sequence:  Axon end- synapse- dendrites- dendron- cyton- axon body- axon end. A nerve impulse travels in a form of electrical charge from 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. Thus, the flow of impulse always flows from one axonal end of a neuron to another dendronal head of a neuron. So, the correct answer is option C.

Which of the following statement about a transmission of a nerve impulse is correct?

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

  1. Nerve impulse travels from dendritic end towards axonal end.

  2. A neuron transmits electrical impulses not only to another neuron but also to muscle and gland cells.

  3. 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.

  4. All of the above.

Show answer
Correct Option: D
Explanation:

For nerve impulses to be generated and carried, nerve cells should be in contact with each other. The nerve impulse is transmitted in the following sequence: 
Axon end- synapse- dendrites- dendron- cyton- axon body- axon end. A nerve impulse travels in a form of electrical charge from 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. Thus, the flow of impulse always flows from one axonal end of a neuron to another dendronal head of a neuron. So, the correct answer is option D.

Muscle A and muscle B are the same size, but muscle A is capable of much finer control than muscle B. Which B. Which one of the following is likely to be true of muscle A?

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

  1. It contains fewer motor units than muscle B.

  2. It has larger sarcomeres than muscle B.

  3. IT is controlled by more neurons than muscle B.

  4. It is controlled by ewer neurons than muscle B.

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Correct Option: A

Lactic acid is generally formed in very fast acting muscle but exceptional muscle 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. Muscles of Iris and pupil

  2. No exception is found

  3. Muscles of heart

  4. Muscles of jaw

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Correct Option: A

Transmission of a nerve impulse across _____very similar to impulse conduction along axon.

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

  1. Ranvier's node

  2. Chemical synapse

  3. Electrical synapse

  4. Myelin sheath

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Correct Option: B