Question

Which of the following is not an example of the response to stimulus?

• A. Watering in the 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.

Answer 1

The correct option is D

A chick hatching out of an egg.

The correct option is D.

Explanation for correct option:

1. Stimuli refer to the response of the organisms toward the changes in the environmental conditions.
2. Every living species reacts when an external stimulus acts on it.
3. When different organs function together in a sequential manner to generate a response to the stimulus is termed coordination.
4. Hatching a chick out of an egg is part of the process known as reproduction.
5. It will take place irrespective stimuli take place or not.
6. The production of offspring is known as reproduction.
7. Hatching a chick from an egg is a part of the sexual mode of reproduction.

Explanation for incorrect options:

Option A:

1. Watering in the mouth when one sees delicious food items is a response to stimuli.
2. Seeing delicious food starts the process of salivation, when one sees or smells tasty food the enzymes get stimulated and the work of digestion starts as the food enters the mouth.
3. Thus, the sight of delicious food acts as stimuli.

Option B:

1. The leaves of Mimosa pudica are sensitive to touch.
2. When touched the stimulus moves to the leaf base and the water present in the vacuoles of the cells move to the adjacent cell.
3. From the leaf all the water escapes, which turns it flaccid, this makes the leaves shrink or close.

Option C:

1. Shutting of eyes when anything approaches towards it is a response to stimuli.
2. The object thrown acts as a stimulus, which instructs the brain to shut the eyes to avoid any kind of injury.

Final answer: A chick hatching out of an egg is not a response to a stimulus.