Control and Coordination Test 22

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Control and Coordination Test 22

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Weekly Quiz Competition

Question 1
1 / -0

Name the part of neuron through which information travels as an electrical impulse away from the cell body.

A
Dendrites

B
Axon

C
Schwann cells

D
None of these

Solution

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'.
Question 2
1 / -0

The bulbous structure present at the terminal end of an axon is ________.

A
Synaptic vesicle

B
Synaptic knob

C
Dendrites

D
Schwann cells

Solution

A. Synaptic vesicle store various neurotransmitters that are released at the synapse.

B. Synaptic knob are the bulbous structures present at the terminal end of an axon.

C. Dendrites, also called dendrons, are branched protoplasmic extensions of a nerve cell that propagate the electrochemical stimulation received from other neural cells to the cell body, or soma, of the neuron from which the dendrites project.

D. Schwann cells, also called neurilemma cells are any of the cells in the peripheral nervous system that produce the myelin sheath around neuronal axons.
So, the correct option is 'B'.
Question 3
1 / -0

Name the part of the neuron, where information is acquired.

A
Axon

B
Dendrites

C
Synapse

D
Schwann cells

Solution

Neuron is a structural and functional unit of neural system. It is composed of three major parts- cell body, dendrites and axon.
A. Axon is a long fibre which arises from the cell body and terminates as a bulb-like structure called the synaptic knob which participate in synapse. Hence, the axons take away the information from the cell body of the neuron to which they belong.
B. Dendrites are the short fibers which arise out from the cell body. The dendrites of one neuron receive the electrical impulses from different sources and then transmit these impulses towards the cell body of the neuron to which they belong. Hence, the information is acquired here.
C. Synapse is the nerve impulse which is transmitted from one neuron to another through the junctions. It is formed by the membranes of the pre-synaptic neuron and a post-synaptic neuron.
D. Schwann cells are enclosed in myelin sheath and are lipid rich cells.
So, the correct option is 'Dendrites'.
Question 4
1 / -0

Neurilemma is name for:

A
Plasmamembrane of axon

B
Coating formed by myelin sheath

C
Covering of schwann cells

D
Connective tissue covering of nerve fasciculus

Solution

Neurilemma is the outermost covering of Schwann cells that surrounds the axon of a neuron. It is also known as neurolemma.
Thus, the correct answer is 'Covering formed by Schwann cells.'
Question 5
1 / -0

The human brain weight approximately ..........% of the body weight.

A
1%

B
2%

C
5%

D
10%

Solution

The adult human brain weighs about 3 pounds (1,300-1,400 g). The adult human brain is about 2 % of the total body weight. The average human brain is 140 mm wide.
So, the correct answer is 2%.
Question 6
1 / -0

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

A
Chondrocytes

B
Epithelial cells

C
Neurons

D
Neuroglial cells

Solution

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'.
Question 7
1 / -0

Which of the following actions are reflex actions?

1.Movement of the diaphragm during respiration
2.Coughing
3.Yawning
4.Sneezing
5.Removal of hand on being touched by hot object

A
A. II and v only

B
B. III,IV and V only

C
C. IV and V only

D
D. I,II,III,IV and V

Solution

Reflex action is an involuntary action and it is a sudden reaction against the stimulus. e.g. removal of hand on being touched by hot or insertion of a pin in a skin, coughing, closing of the eyelid when any object enters in the eye
But Movement of the diaphragm during respiration is due to movement of Ribs muscles and Yawning and sneezing are involuntary actions not reflex actions.
So, the correct answer is 'Coughing and removal of hand on being touched by hot object'
Question 8
1 / -0

Cytokinin and auxin are antagonistic in which of the following function?

A
Cell division

B
Phototropism

C
Apical dominance

D
Geotropism
Solution
- The main function of Auxin is to promote stem elongation and inhibition of growth of lateral buds to maintain apical dominance.
- It is produced in the stem tips, buds and root tips to promote growth and it also helps to repair wounds in plants.
- The function of cytokinins is to increase the cell division by stimulating the process of mitosis which helps in plant growth and formation of shoots and buds.
- Cytokinins promote sprouting of lateral buds and overcome apical dominance.
- Cytokinin and auxin are antagonistic for apical dominance.
- So the correct answer is 'Apical dominance'.
Question 9
1 / -0

Find the odd one out among the components that are involved in a reflex arc.

A
Afferent neuron

B
Relay neuron

C
Effector organ

D
All of the above
Solution
- The sequence of events in a reflex arc is as follows:
- The sensory neuron, collects sensory information in the form of stimulus (e.g. heat), from the sensory organs (e.g. skin).
- The sensory neuron passes the impulse to the relay neuron present in the spinal cord.
- The nerve impulse is now passed on to the motor neuron.
- Motor neuron passes the information to the effector organ (e.g muscle) and accordingly, the movement occurs (e.g removing the hand away from the heated surface)
- So, the correct option is B.
Question 10
1 / -0

Rooting plant hormone is

A
$$IBA$$

B
$$2, 4-D$$

C
$$2,4,5-T$$

D
$$NAA$$

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Re-Attempt Weekly Quiz Competition

Control and Coordination Test 22

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Control and Coordination Test 22

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SHARING IS CARING

Question 1

Dendrites

Axon

Schwann cells

None of these

Solution

Question 2

Synaptic vesicle

Synaptic knob

Dendrites

Schwann cells

Solution

Question 3

Axon

Dendrites

Synapse

Schwann cells

Solution

Question 4

Plasmamembrane of axon

Coating formed by myelin sheath

Covering of schwann cells

Connective tissue covering of nerve fasciculus

Solution

Question 5

1%

2%

5%

10%

Solution

Question 6

Chondrocytes

Epithelial cells

Neurons

Neuroglial cells

Solution

Question 7

A. II and v only

B. III,IV and V only

C. IV and V only

D. I,II,III,IV and V

Solution

Question 8

Cell division

Phototropism

Apical dominance

Geotropism

Solution

Question 9

Afferent neuron

Relay neuron

Effector organ

All of the above

Solution

Question 10

$$IBA$$

$$2, 4-D$$

$$2,4,5-T$$

$$NAA$$

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