Stimulus and ResponseStimulus and Response

Why animals and plants do what they do Why animals and plants do what they do OROR

A fancy way of saying A fancy way of saying causecause and and effecteffect in in the animal world.the animal world.

CatalystCatalyst

1. Describe a situation in which you were 1. Describe a situation in which you were immediately scared and/or reacted immediately scared and/or reacted quickly to something. Write at least 1 quickly to something. Write at least 1 paragraph with 4 sentences describing paragraph with 4 sentences describing your experience.your experience.

2. Take out your vocab books and your 2. Take out your vocab books and your colors.colors.

3. Take out your dry erase board.3. Take out your dry erase board.

After today you will be able to:After today you will be able to:

1. Identify and classify stimuli as 1. Identify and classify stimuli as internal or externalinternal or external

2. Define a response.2. Define a response.3. Identify behavior as learned 3. Identify behavior as learned

behavior or instinct.behavior or instinct.

What is a stimulus?What is a stimulus?

Stimulus:Stimulus: any change in an organism’s any change in an organism’s environment that causes to the environment that causes to the organism to react. organism to react. It is a fancy way of It is a fancy way of saying “cause”.saying “cause”.

StimulusStimulus – singular – singular StimuliStimuli – plural – plural

Example: An animal is cold so it moves into the sun.Example: An animal is cold so it moves into the sun.

(Add this word to your vocabulary book)(Add this word to your vocabulary book)

What is a response?What is a response?

Response:Response: how the organism how the organism reacts to a stimulus and results in reacts to a stimulus and results in a change in behavior.a change in behavior. It is a It is a fancy way of saying “effect”.fancy way of saying “effect”.

Example: Getting a drink when you are Example: Getting a drink when you are thirsty.thirsty.

(Add this word to your vocabulary book)(Add this word to your vocabulary book)

Examples of stimuli and their Examples of stimuli and their responses:responses:

• You are hungry so you eat some foodYou are hungry so you eat some food• A rabbit gets scared so it runs awayA rabbit gets scared so it runs away• You are cold so you put on a jacketYou are cold so you put on a jacket• A dog is hot so lies in the shadeA dog is hot so lies in the shade• It starts raining so you take out an It starts raining so you take out an

umbrellaumbrella

Plants also respond to their Plants also respond to their environment. When a plant grows environment. When a plant grows towards the sun we call this towards the sun we call this phototropismphototropism ..

Think – Pair - ShareThink – Pair - Share

Turn to your partner and Turn to your partner and share two other stimuli share two other stimuli and their responses. and their responses.

There are two types of stimuli:There are two types of stimuli:

External StimuliExternal Stimuliandand

Internal StimuliInternal Stimuli

External StimulusExternal Stimulus

External stimulus: a stimulus that External stimulus: a stimulus that comes from outside an organism.comes from outside an organism.

Examples: Examples: 1. You feel cold so you put on a jacket.1. You feel cold so you put on a jacket.2. A snake lunges at a rabbit so it runs away.2. A snake lunges at a rabbit so it runs away.3. A dog feels hot so it goes to lay in the shade.3. A dog feels hot so it goes to lay in the shade.

Add this word to your vocabulary book.Add this word to your vocabulary book.

Internal StimulusInternal Stimulus

Internal stimulus:Internal stimulus: a stimulus that comes a stimulus that comes from inside an organism.from inside an organism.

Examples: Examples: 1. You feel hungry so you eat some food.1. You feel hungry so you eat some food.2. A cat feels thirsty so it drinks water.2. A cat feels thirsty so it drinks water.3. A dog feels hot so it goes to lay in the shade.3. A dog feels hot so it goes to lay in the shade.

Add this word to your vocabulary book.Add this word to your vocabulary book.

Make a T-chart on your dry erase board and label Make a T-chart on your dry erase board and label the columns the columns internalinternal and and externalexternal. Put the letter of . Put the letter of each stimulus in the proper column. each stimulus in the proper column.

A.A. You have a stomach ache and decide to You have a stomach ache and decide to lay down.lay down.

B.B. A bird is thirsty and drinks some water.A bird is thirsty and drinks some water.C.C. A squirrel sees a cat and runs up a tree.A squirrel sees a cat and runs up a tree.D.D. A lion gets hungry and eats a gazelle.A lion gets hungry and eats a gazelle.E.E. You see a spider and scream.You see a spider and scream.

Animals can respond to stimuli in Animals can respond to stimuli in two ways:two ways:1. In a way that they learned. We call this 1. In a way that they learned. We call this

learned behavior.learned behavior.

OROR

2. In a way that they were just born knowing 2. In a way that they were just born knowing how to do. We call this how to do. We call this instinct.instinct.

Learned behavior:Learned behavior: a a response to a stimulus response to a stimulus that an animal was that an animal was taught.taught.

Add this word to your vocabulary bookAdd this word to your vocabulary book

A mother bear teaching her cubs to A mother bear teaching her cubs to fishfish

Teaching an animal a trickTeaching an animal a trick

Training a dogTraining a dog

Even Even youyou have learned behavior. have learned behavior. For example, you learned to read For example, you learned to read and to talk.and to talk.

Instinct:Instinct: an animal’s natural an animal’s natural reaction to a stimulus. It is reaction to a stimulus. It is an automatic reaction that an automatic reaction that the animal was not taught to the animal was not taught to do.do.

Add this word to your vocabulary bookAdd this word to your vocabulary book

Animals natural instinct is to run Animals natural instinct is to run away from danger. We call this the away from danger. We call this the need for safety. need for safety.

Animals will naturally find or make Animals will naturally find or make themselves a home because they themselves a home because they have a need for shelter. have a need for shelter.

Animals will naturally look for food Animals will naturally look for food and water. and water.

Animals that need to will naturally Animals that need to will naturally migrate. migrate.

Animals instinctually know to store Animals instinctually know to store their food for the winter.their food for the winter.

Think – Write - ShareThink – Write - Share

On your board write down one On your board write down one learned behavior that you have an learned behavior that you have an one instinct that you have.one instinct that you have.

Summarize what you have learned today. On a Summarize what you have learned today. On a

sheet of NBP answer the fol lowing questions.sheet of NBP answer the fol lowing questions. 1.1. What is a stimulus?What is a stimulus?2.2. What is a response?What is a response?3.3. Give one example of a stimulus and its Give one example of a stimulus and its

response.response.4.4. What is an internal stimulus?What is an internal stimulus?5.5. What is an external stimulus?What is an external stimulus?6.6. It is raining and you open up an umbrella. Is this It is raining and you open up an umbrella. Is this

an internal or external response? Justify your an internal or external response? Justify your answer. answer.

7.7. What is learned behavior?What is learned behavior?8.8. What is an instinct?What is an instinct?9.9. When a rabbit runs away from a wolf is this When a rabbit runs away from a wolf is this

learned behavior or instinct? Justify your learned behavior or instinct? Justify your answeranswer..