Tag: reflex action and reflex arc

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

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.

  1. All of the above

  2. (i) and (iii)

  3. (i) and (ii)

  4. (ii) and (iii)
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

Closing both the eyes when a torch light is flashed on one eye is a part of 

  1. Reflex action

  2. Chemotropism

  3. Hormonal control

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

Which is not a reflex action?

  1. Swallowing of food

  2. Shivering in cold

  3. Salivation at choicest food

  4. Closure of eyes lids by flashing light
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Swallowing food is a complex process involving both voluntary and involuntary muscle coordination, but it is not classified as a simple reflex action in the same way as blinking or shivering.

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

Reflex action is

  1. Stimulus Sensory Motor Response

  2. Stimulus Motor Sensory Response

  3. Receptor Motor Sensory Response

  4. Sensory Stimulus Motor Response
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A reflex arc follows the pathway: Stimulus -> Receptor -> Sensory neuron -> Integration center (spinal cord) -> Motor neuron -> Effector -> Response.

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

Which of the following is not an involuntary action?

  1. Vomiting

  2. Salivation

  3. Heart beat

  4. Chewing
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

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

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
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' 

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

Different type of reflex arc is_____________

  1. Somatic Reflex arc

  2. Visceral Reflex arc

  3. Both A and B

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

Which among the following is the correct definition of taxis?

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

Monosynaptic reflex is a _____________

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
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.