Question

Identify Stimulus and Response in the following situations:

(i) Our eyes shut automatically when we suddenly move from a dark place into bright sunlight

(ii) Our mouth starts watering seeing our favorite food

Answer 1

Answer:

I)when we move from a dark room into bright sunshine our eyes began to flitter and close because our eyes becomes used to the dark light and then it flitters till our eyes don't adapt to be in sunshine. When we move from dark room to bright sunshine , our eyes cannot adapt so much of sunlight in few seconds.

ii) When we see delicious food, the saliva is secreted as a reflex action by the body, in anticipation of us eating the food and the body preparing itself to digest the said food. As soon as nerves transfer the message, in response, the salivary glands produce the saliva thus your mouth water as you see the spicy food.

Answer 2

• All living creatures require some way of controlling and coordinating their actions in order for their many organs to function as a unit.
• The nervous system and endocrine system are used by most species to attain this goal.
• The nervous system is made up of a collection of organs that manage and coordinate the actions of the body's many sections in response to environmental changes.
• The mechanisms of control and coordination in plants and animals will be discussed in length in this chapter.
• But first, we'll go through the definitions of the terms stimulus and reaction, which will help us grasp the rest of the chapter.
• The term "stimulus" refers to a change in the environment that produces a change in an organism's activity or behaviour.
• Heat, light, cold, pressure, scent, touch, water, and gravity all have varied effects on various creatures.
• Every creature responds to a stimulus by moving its body in a certain way.
• Response is the term for this. The plants, for example, bend towards the sun when it shines.
• The stimulus in this case is sunshine, and the plants respond by bending towards it.