Tag: zoology

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Questions Related to zoology

Multiple choice zoology control and coordination in living organisms the reflex action reflex action and reflex arc basic reflex action and reflex arc
Medulla oblongata controls involuntary functions.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Medulla oblongata is the part of hindbrain. It is located in the brainstem, anterior to the cerebellum. It controls the involuntary functions . It is linked to the autonomic system and has cardiac, respiratory, vomiting and vasomotor centres. It also controls breathing heart rate and blood pressure.

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

All movements in response to the environment can be carefully controlled.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Each kind of a change in the environment evokes an appropriate movement in response. When we want to talk to our friends in class, we whisper, rather than shouting loudly. So, the movement to be made depends on the event triggering it. Hence, such controlled movement must be connected to the recognition of various events in the environment, followed by only the correct movement in response. 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 of the following statements are true about reflex action?
i. It is a response activated after the activity or incident completes.
ii. It is an involuntary action.
iii. It is the sudden action in response to something in the environment.
iv. Impulse is carried to the brain directly for the response.

  1. (ii) and (iii)

  2. (ii) and (iv)

  3. Both A and B

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Reflex action is an action which is given in response to something in the environment. It is an immediate action taken without much thinking and it does not have our control. The spinal cord is responsible for the response of the body because the impulse has not reached the brain till then. 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

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'