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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
What is the difference between a voluntary and an involuntary action? Which kind of action is digestion? Explain your choice.
What is a reflex action? Explain with the help of an example.
A cell (or group of cells) in a sense organ which is sensitive to a particular type of stimulus is called :
(a) interceptor
(b) effector
(c) receptor
(d) acceptor
Which of the following is not an involuntary action?
(a) vomiting
(b) chewing
(c) heart beat
(d) salivation
The part of brain which takes part in regulating respiration in the human body is :
(a) medulla
(b) pons
(c) cerebellum
(d) cerebrum
The olfactory receptors in humans are located in :
(a) eyes
(b) tongue
(c) ears
(d) nose
P is a cell (or group of cells) in the human body which is sensitive to a particular type of stimulus and conveys the messages to CNS through nerves Q. On the other hand, R is a part of the human body which can respond to a stimulus according to the instructions sent from the CNS through nerves S.
(a) What is P? Name five organs which contain cells (or group of cells) like P.
(b) Name the nerves Q.
(c) What is R? Give two examples of R.
(d) Name nerves S.
(e) How do messages travel through the nerves Q and S?
Write down the following activities in the correct order for a simple reflex arc:
(a) impulse travels in the motor fibre
(b) impulse travels in the sensory fibre
(c) effector organ stimulated
(d) impulse crosses the synapse
State whether the following is simple reflex, conditioned reflex or neither of the two.
Contraction of eye pupil
State whether the following is simple reflex, conditioned reflex or neither of the two:
Lifting up a book: …………………..
List in tabular form two differences between reflex action and walking.
Define the following:
Reflex action
Reflex action is controlled by the
State whether the following is
Sneezing
Give Technical Term:
The scientist, who conducted experiment on a dog to show conditioned reflex
A change in the environment that causes an animal to react is called ______.
Reflex arc allows the rapid response of the body to a stimulus.
Which of the following is not involved in Knee-jerk reflex?
Categorise the following under stimulus and response.
Withdrawal of hand on touching a hot plate
