Tag: reflex action and reflex arc basic

Questions Related to reflex action and reflex arc basic

State which of the following incidents are involuntary in nature.
 

i.   Rehan running in a 100-meter race.
 ii.  Preeti sneezing due to cold.
 iii. Rahul pricked his finger by the needle while sewing his shirt.

zoology control and coordination in living organisms the reflex action reflex action and reflex arc basic reflex action and reflex arc

  1. All of the above

  2. (i) and (iii)

  3. (i) and (ii)

  4. (ii) and (iii)

Show answer
Correct Option: D
Explanation:

  • Voluntary actions are those which can be controlled by us like clapping, dancing, jumping, running, etc. 
  • Whereas, involuntary actions are those which cannot be regulated or stopped by us like the circulation of blood, heartbeat, etc. Hence, reflex actions are involuntary actions that are done to save oneself from danger. 

Therefore, the correct answer is option D.


Closing both the eyes when a torch light is flashed on one eye is a part of 
zoology control and coordination in living organisms the reflex action reflex action and reflex arc basic reflex action and reflex arc

  1. Reflex action

  2. Chemotropism

  3. Hormonal control

  4. None of these

Show answer
Correct Option: A
Explanation:

  • The best-known reflex is the pupillary light reflex. If a light is flashed near one eye, the pupils of both eyes contract.
  •  Light is the stimulus, impulses reach the brain via the optic nerve, and the response is conveyed to the pupillary musculature by autonomic nerves. 

Therefore, the correct answer is option A.

Which is not a reflex action?

zoology control and coordination in living organisms the reflex action reflex action and reflex arc basic reflex action and reflex arc

  1. Swallowing of food

  2. Shivering in cold

  3. Salivation at choicest food

  4. Closure of eyes lids by flashing light

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Correct Option: A

Ivan Pavlov performed experiments on

zoology control and coordination in living organisms the reflex action reflex action and reflex arc basic reflex action and reflex arc

  1. Simple reflexes

  2. Conditioned reflexes

  3. Cardiac reflexes

  4. Origin of life

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Correct Option: B

Reflex action is

zoology control and coordination in living organisms the reflex action reflex action and reflex arc basic reflex action and reflex arc

  1. Stimulus Sensory Motor Response

  2. Stimulus Motor Sensory Response

  3. Receptor Motor Sensory Response

  4. Sensory Stimulus Motor Response

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Correct Option: A

Which of the following is not an involuntary action?

zoology control and coordination in living organisms the reflex action reflex action and reflex arc basic reflex action and reflex arc

  1. Vomiting

  2. Salivation

  3. Heart beat

  4. Chewing

Show answer
Correct Option: D
Explanation:

Involuntary actions are the actions which are happening without the conscious choice of an organism. The examples for involuntary actions are: Vomiting, yawning, salivation, heart beats, coughing, sneezing, etc.  Whereas chewing is a voluntary action, which is controllable.

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

zoology control and coordination in living organisms the reflex action reflex action and reflex arc basic reflex action and reflex arc

  1. A. II and v only

  2. B. III,IV and V only

  3. C. IV and V only

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

Show answer
Correct Option: A
Explanation:

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' 

Different type of reflex arc is_____________

zoology control and coordination in living organisms the reflex action reflex action and reflex arc basic reflex action and reflex arc

  1. Somatic Reflex arc

  2. Visceral Reflex arc

  3. Both A and B

  4. None of these

Show answer
Correct Option: C
Explanation:

There are two types of reflex arcs namely, autonomic (visceral) reflex arc, affecting inner organs and somatic reflex arc, affecting muscles. 

Therefore, the correct answer is option C.

Which among the following is the correct definition of taxis?

zoology control and coordination in living organisms the reflex action reflex action and reflex arc basic reflex action and reflex arc

  1. The movement of a body towards or away from the stimulus is called taxis

  2. The movement of a body away from the stimulus is called taxis

  3. The movement of a body towards the stimulus is called taxis

  4. None of these

Show answer
Correct Option: A
Explanation:

  • The movement of animals towards or away from the stimulus is called as the taxis. The taxis may be negative or positive. 
  • The movement away from a stimulus is called negative taxis and the movement towards the stimulus is called positive taxis.


Therefore, the correct answer is option A.

Monosynaptic reflex is a _____________

zoology control and coordination in living organisms the reflex action reflex action and reflex arc basic reflex action and reflex arc

  1. Complex reflex arc consisting of two sensory neurons and one motor neuron

  2. Simple reflex arc consisting of two sensory neurons and one motor neuron

  3. Simple reflex arc consisting of one sensory neuron and one motor neuron

  4. Simple reflex arc consisting of one sensory neuron and two motor neurons

Show answer
Correct Option: C
Explanation:

  • A simple reflex arc consists of only one sensory neuron and one motor neuron, hence the name is the monosynaptic reflex. A complex reflex arc or polysynaptic reflex is formed when the sensory neuron influences several motor neurons through intermediate (association) neurons of the spinal cord. Complex reflex arc consisting of two sensory neurons and one motor neuron.


Therefore, the correct answer is option C.