Question

IV. 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.​

Answer 1

Answer:

Explanation:

1. The nature of the formation of the image depends on the lens used. In the eye, the lens present is a convex lens which focuses the incident rays of light coming from the object on the retina and forms the real and inverted image on the retina. ... Thus, the convex lens of the eye is the correct answer.
2. Sound waves are generally collected in our outer ear which is otherwise known as pinna. Even they also travel down our ear canal and strike the eardrum, causing it to vibrate. Inner ear plays also changes the vibrations which is also created by the sound waves into electrical impulses, or signals.
3. We move our hand away from a hot object. This is due to responsiveness to stimuli. When we touch a hot object the sense organs feel the temperature and the hand is withdrawn. The stimulus is carried to the brain by the sensory neuron while it is carried back to effector organs by motor neurons.
4. When our nose smells something unpleasant or pungent we close our nose to prevent ourselves from continuing to smell the foul odor. We now know that the noseis a very sensitive organ.