Mrs. Keadle

JH Science

Name__________________________________ period _____ date assigned_____________ date due ______________ date returned _____________

Stimulus and Response 1. What is a stimulus? __________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ a. Circle the stimulus in the following two examples. Example: An animal is cold so it moves into the sun. Example: Getting a drink when you are thirsty. 3. What is a response? __________________________________________________________ __________________________________________________________________________ ____________________________________________________________________________ a. Circle the response in the following two examples. Example: An animal is cold so it moves into the sun. Example: Getting a drink when you are thirsty.

4. For the following statements, circle the stimulus and underline the response:

a. You are hungry so you eat some food b. A rabbit runs away when it sees a coyote. c. You are really cold so you put on a jacket. d. A clam swims away quickly after sensing a starfish. e. You take out an umbrella because it is raining. f. Sunlight is coming through an apartment window and the plant is bending toward the light. g. A cat falls in the bathtub and jumps out screeching.

1 Stimulus and Response

Mrs. Keadle

JH Science

5. Plants can also respond to stimuli. These are called tropisms. Can you remember some of the tropisms?

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6. What is an external stimulus? ___________________________________________________ _________________________________________________________________________ ___________________________________________________________________________ a. Circle the stimulus in the following examples. Example: You feel cold so you put on a jacket. Example: A snake lunges at a rabbit so it runs away. Example: It is a very hot, sunny day so a dog sits in the shade.

7. What is an internal stimulus? __________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ a. Circle the stimulus in the following examples. Example: You feel hungry so you eat dome food. Example: A cat feels thirsty so it drinks water. Example: A dog feels sick, so it’s body triggers a fever.

2 Stimulus and Response

Mrs. Keadle

JH Science

8. What is a learned behavior?_______________________________________ ______________________________________________________________ _____________________________________________________________ List two examples of learned behaviors: 1. ________________________________________________________ ________________________________________________________ 2. ________________________________________________________ ________________________________________________________

9. Describe the learned behavior experiment done by Ivan Pavlov: ____________________________________________________ ____________________________________________________ ____________________________________________________ ____________________________________________________ ____________________________________________________

10. What is an instinct?_______________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ List two examples of instincts: 1. ________________________________________________________ ________________________________________________________ 2. ________________________________________________________ ________________________________________________________

3 Stimulus and Response

Mrs. Keadle

JH Science

11. Complete the chart for the following statements:

Statement

What is the Stimulus?

Is this an internal or external stimulus?

What is the Response?

You have a stomach ache and decide to lay down. A bird is thirsty and drinks some water. A mouse sees a cat and hides under a log . You see a spider and scream. A dog sits when it is given a treat. Winter is coming so a squirrel stores nuts.

4 Stimulus and Response

Mrs. Keadle

JH Science

Read the procedure for the pill bug responses lab. After Watching the pill bug video, describe the pill bugs behavior. 29. Record how many pill bugs are in each quadrant.

dark, damp

light, damp

dark, dry

light, dry

30. What two stimuli are the pill bugs responding to?

31. Are these stimuli internal or external?

32. Write a one paragraph conclusion describing what the pill bugs are responding to and how they are responding. Your paragraph should be at least 5 sentences.

5 Stimulus and Response

Mrs. Keadle

33 The process by which an organism's internal environment is kept stable in spite of changes in the external environment is called

JH Science

35 A signal that comes from outside the body and causes an organism to react in some way is called a(n) A external stimulus

A growth B response B digestion C internal stimulus C homeostasis D message D respiration

34 A signal that comes from inside the body and causes an organism to react in some way is called a(n) -

36 Identify the statement that describes a cat’s response to an internal stimulus

A external stimulus

A A cat eats when it feels hungry.

B response

B A cat runs in the house to get out of the rain.

C internal stimulus D message

C A cat hisses when it sees a dog. D A cat purrs while it is scratched.

6 Stimulus and Response

Mrs. Keadle

JH Science

37 Identify the statement that describes a bird’s response to an external stimulus. A A bird sings a song to attract a mate. B A bird cleans its feathers after landing in a tree. C A bird flies away when it sees a cat nearby D A bird eats when it feels hungry.

38 Earthworms live in the soil and prefer dark, moist environments. When they see light, they respond _________ by moving away from it. This is a response to an __________ stimulus A negatively, external B positively, external C negatively, internal D positively, external

7 Stimulus and Response