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प्रश्न
Which of the following is not a natural reflex action?
विकल्प
Knee-jerk
Blinking of eyes due to strong light
Salivation at the sight of food
Sneezing when any irritant enters the nose
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उत्तर
Salivation at the sight of food
Explanation:
Salivation at the sight of food is a conditioned (learned) reflex that depends on past experience. The other options are natural (inborn) reflexes present since birth.
संबंधित प्रश्न
If we happen to touch a hot object unknowingly, we immediately pull back our hand. What is this type of action known as?
Which part of the eye contains cells which are sensitive to light?
When you smell a favourite food your mouth begins to water (that is, you secrete saliva). Write down what is the example of the gland which is stimulated to secrete saliva.
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
State whether the following is simple reflex, conditioned reflex or neither of the two:
Lifting up a book: …………………..
Define the following:
Reflex action
State whether the following is simple reflex, conditioned reflex or neither of the two.
Knitting without looking
Mention, if the following statement is True or False
Reflex action involves brain
Why have reflex arcs evolved in animals?
