Which of the following is not a response to an external stimulus?

Salivating on seeing food

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Ducking when an object is thrown suddenly

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Receiving a long air-pass in football

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Closing of eyes while sneezing

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Solution

The correct option is C
Receiving a long air-pass in football

Receiving a long air-pass in football is a well thought off response to an external stimulus, where, a part of your conscious decision making, decides how to receive the ball while it is in the air.

Salivating on seeing food, ducking when an object is thrown suddenly and closing of eyes while sneezing are responses that are not thought off before being executed. They are involuntary responses to an external force.

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Question 6

Which of the following is not an example of response to a stimulus?
(a) Watering in mouth when we see delicious food items.
(b) Closing of leaves of Mimosa plant when touched.
(c) Shutting our eyes when an object is suddenly thrown in our direction.
(d) A chick hatching out of an egg.

Question 6

Why our eyes were closed while sneezing

Why do we see this happening?

(a) People look up when an aeroplane passes overhead, high up in the sky.

(b) When a beam of light flashes on the eyes, the eyes close quickly.

(d) If somebody shouts suddenly right behind us, we get startled.

Q. An object is placed at a distance of 30 cm from a converging lens of focal length 15 cm. A normal eye (near point 25 cm, far point infinity) is placed close to the lens on the other side. (a) Can the eye see the object clearly? (b) What should be the minimum separation between the lens and the eye so that the eye can clearly see the object? (c) Can a diverging lens, placed in contact with the converging lens, help in seeing the object clearly when the eye is close to the lens?

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