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प्रश्न
How do we detect the smell of an agarbatti (incense stick)?
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उत्तर
When the smell of the incense stick reaches our nose, then the factory receptors present in our nose detect it and send this information to the forebrain in the form of electrical signals. The brain interprets this information as the smell of incense sticks where it is already stored.
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संबंधित प्रश्न
Name the most important part of the human brain.
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.
Cerbellum, medulla and pons are the parts of :
(a) mid-brain
(b) hind-brain
(c) forebrain
(d) spinal cord
When we touch a hot plate unknowingly, then this heat is sensed by a receptor P present in our fingers. The receptor triggers and impulse in neuron Q which transmits the message to an organ R which is a part of the central nervous system. Here the impulse is passed on to a neuron S which in turn passes it to a yet another neuron T. The neuron T passes the impulse to a tissue U in our arm. The tissue U then contracts and pulls our hand away from the hot plate.
(a) What is the name of (i) receptor P (ii) neuron Q, and (iii) organ R?
(b) What is (i) neuron S, and (ii) neuron T?
(c) Name the tissue U.
(d) What name is given to the phenomenon in which hand is pulled away quickly from the hot plate?
(e) Name the effector in this whole process.
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
Note the relationship between the first two words and suggest the suitable word/words for the fourth place.
Stimulus : Receptor :: Impulse : ______.
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: …………………..
Give one example of a conditioned reflex in your own life.
State whether the following is
Constriction of pupil
State whether the following is
The sudden application of brakes without thinking
What type of reflex is the following?
Formation of goose-pimples in cold weather.
A change in the environment that causes an animal to react is called ______.
Give an example for conditioned reflexes.
What will you do if someone pricks your hand with a needle? Elucidate the pathway of response with a neat labelled diagram.
Which of the following is an example of unconditioned reflex?
Which one of the following is not a simple reflex?
Which of the following is not involved in Knee-jerk reflex?
The given diagrammatic representation of reflex action shows knee jerk reflex.
Identify the parts labeled as A to E and select the correct option.
