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प्रश्न
Which of the following are cerebral reflexes?
(i) a person pulls away his hand on touching a hot object
(ii) a person spits out immediately when a fly enters his mouth while talking
(iii) A person walking bare foot lifts his foot at once on stepping on to a nail
(iv) A person's pupil contracts at once in the presence of bright light
(a) (i) and (ii) (b) (ii) and (iii) (c) (iii) and (iv) (d) (ii) and (iv)
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उत्तर
(d) (ii) and (iv)
Cerebral reflexes are those reflex actions which involve the brain. They occur in the organs present in the head as these organs are directly connected to the brain.
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संबंधित प्रश्न
Which of the following is not a natural reflex action?
A. Knee-jerk
B. Blinking of eyes due to strong light
C. Salivation at the sight of food
D. Sneezing when any irritant enters the nose
State whether coughing is a voluntary action or reflex action.
Fill in the following blank with suitable word :
A neuron which carries an impulse to the brain is called a ........... neuron.
What is the difference between a voluntary and an involuntary action? Which kind of action is digestion? Explain your choice.
All the voluntary actions of our body are controlled by :
(a) cerebrum
(b) cerebellum
(c) pons
(d) medulla
Which of the following statements are true?
(i) sudden action in response to something in the environment is called reflex action
(ii) sensory neurons carry electrical signals from spinal cord to muscles in a reflex action
(iii) motor neurons carry signals from receptors to spinal cord in a reflex action
(iv) the pathway of transmitting signals from a receptor to a muscle is a reflex action
Put a tick mark (✓) against the correct alternative in the following statement:
The smell of good food causes watering of your mouth. It is a
Your are driving your bicycle at a fast speed. Suddenly, a small boy comes in front of your cycle and, without wasting any time in thinking, you immediately apply the brakes and accident is avoided. What name is given to such an action?
State whether the following is simple reflex, conditioned reflex or neither of the two.
Contraction of eye pupil
Two hungry boys (A and B) enter a restaurant and find a table decorated as follows:
Boy B starts salivating but not A. Explain the reason for this difference.
Explain the mechanism of reflex action with the help of a suitable diagram.
What type of reflex is the following?
Solving mathematical sums
What type of reflex is the following?
Formation of goose-pimples in cold weather.
Give Reason:
The hand automatically shows the direction to turn a cycle without thinking.
Give an example for conditioned reflexes.
Which of the following is an example of unconditioned reflex?
The reflex arc which is made up of one sensory and one motor neuron is ______
How is the mode of action in beating of the heart different from reflex actions? Give four examples.
Why have reflex arcs evolved in animals?
