Stimulus and Response

Transcription

1 Name period date assigned date due date returned 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

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

3 8. What is a learned behavior? List two examples of learned behaviors: Describe the learned behavior experiment done by Ivan Pavlov: 10. What is an instinct? List two examples of instincts:

4 11. Complete the chart for the following statements: Statement You have a stomach ache and decide to lay down. What is the Stimulus? Is this an internal or external stimulus? What is the Response? 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

5 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

6 33 The process by which an organism's internal environment is kept stable in spite of changes in the external environment is called A growth B digestion C homeostasis D respiration 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 B response C internal stimulus D message 34 A signal that comes from inside the body and causes an organism to react in some way is called a(n) - A external stimulus B response C internal stimulus D message 36 Identify the statement that describes a cat s response to an internal stimulus A A cat eats when it feels hungry. B A cat runs in the house to get out of the rain. C A cat hisses when it sees a dog. D A cat purrs while it is scratched. 6

7 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