How do the following processes occur? (AS 1)
1. When we see an object, a real inverted image is formed on the retina.
2. The sound waves, collected by the pinna are changed as vibrations.
3. We move our hand away from a hot object.
4. A pungent odour, makes us close our nose.
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Answers
Answer:
3.we move our hand away from the hot object because our skin burnt and our cell take the sensation and send to brain to remove the hand from the hot objects
Explanation:
1) When we see an object the eye gathers light through a convex lens, focusses it and forms an image in the retina at the back of the eye.
The lens turns the image left to right and upside down
2)External ear or pinna collects the sound waves.
They enter into the auditory meatus or ear canal. Then they strike the tympanum.
The vibrations from the tympanum reach the malleus, incus and stapes in the middle ear.
They magnify the intensity of the sound vibrations and send them to the membrane of oval window in middle ear.
3)Moving our hand from a hot object is an unconditional reflex.
Unconditional reflexes are inherited and shown from birth.
Unconditional reflexes are present in all individuals and are basically same.
4)The olfactory receptors sense pungent odour, that information is sent to brain in the form of nerve impulses through sensory nerve.
The brain interprets the information and identifies it as pungent odour.
It sends message to our hand to close the nose immediately.
The brain also sends information in the form of nerve impulses through motor nerves as we are unable to smell the food’s delicious aromas.