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Important General Science Questions for RRB JE CGL 2020

Directions: Study the following questions carefully and choose the right answer:
Important for :
Railways
1
Receptors used to detect taste are known as 
» Explain it
A
Gustatory receptors detect taste while olfactory receptors detect smell. Nerve cell receptors detect temperature etc.

Hence, option A is correct.
 
2
The ending of a nerve cell used to acquire information from our environment is called
» Explain it
C
The ending used for information gathering is called a dendrite.

Hence, option C is correct.

3
The long, slender projection of a nerve cell that conducts electrical impulses (carrying information) away from the nerve cell body and transmits this information to different neurons, muscles, and glands is known as
» Explain it
B
An axon, also known as nerve fiber, is a long, slender projection of a nerve cell, or neuron, that typically conducts electrical impulses known as action potentials, away from the nerve cell body. The function of the axon is to transmit information to different neurons, muscles, and glands.

Hence, option B is correct.
 
4
Information from one neuron flows to another neuron across a ________?
» Explain it
A
The synapse contains a small gap separating neurons. The synapse consists of: 
 
• a presynaptic ending that contains neurotransmitters, mitochondria and other cell organelles. 
 
• a postsynaptic ending that contains receptor sites for neurotransmitters

• a synaptic cleft or space between the presynaptic and postsynaptic endings.


Hence, option C is correct.
 
5
When the electric impulse travels along the axon and reaches the other end called the synaptic terminal, this impulse triggers the release of 
» Explain it
A
The electrical impulses stimulate the release of vesicles. These store various neurotransmitters that are released at the synapse. Vesicles are essential for propagating nerve impulses between neurons and are constantly recreated by the cell.

Hence, option A is correct.