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प्रश्न
The olfactory receptors in humans are located in :
(a) eyes
(b) tongue
(c) ears
(d) nose
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उत्तर
(d) nose
The olfactory receptors which detect smell are located in the nose.
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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
Name one gustatory receptor and one olfactory receptor present in human beings.
The diagram given below shows the internal structure of a spinal cord depicting a phenomenon. Study the diagram and answer the questions:
1) Name the phenomenon that is depicted in the diagram. Define the phenomenon.
2) Give the technical term for the point of contact between the two nerve cells.
3) Name the parts numbered 1, 2 and 3.
4) How does the arrangement of neurons in the spinal cord differ from that of the brain?
5) Mention two ways by which the spinal cord is protected in our body.
Name two parts of the body which contain receptors of chemical stimuli.
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 cells in your nasal passages which perceive the smell?
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.
What is a reflex action? Explain with the help of an example.
The part of brain which takes part in regulating respiration in the human body is :
(a) medulla
(b) pons
(c) cerebellum
(d) cerebrum
State whether the following is simple reflex, conditioned reflex or neither of the two:
Blushing: ……………….
Reflex action is controlled by the
State whether the following is
Constriction of pupil
State whether the following is simple reflex, conditioned reflex or neither of the two.
Lifting up a book
State whether the following is simple reflex, conditioned reflex or neither of the two.
Knitting without looking
State whether the following is
Salivation when food is put in the mouth.
What type of reflex is the following?
Sweating in summer
Give Technical Term:
Response to a stimulus without the intervention of the will of an animal.
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?
