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Stimulus and Response

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Stimulus and Response

Plant growing towards sunlight

🌱 Part 1: Understanding Stimulus and Response

1. A stimulus is something that causes a reaction. Circle the best definition:

A change in the environment that can be detected

A plant growing in soil

The colour green in leaves

2. A response is the reaction to a stimulus. Which are examples of responses? (Tick all that apply)

A plant bending towards light

Pulling your hand away from something hot

A rock sitting still

Your pupils getting smaller in bright light

3. Complete the sentence using the words below:

Words to use: stimulus, response, light, bending

When a plant receives _________ from one direction (the _________), it reacts by _________ towards the light (the _________).

🔬 Part 2: Planning Our Investigation

4. Our investigation question is: "How do plants respond to light coming from one direction?"

Write your hypothesis using this sentence starter:

If a plant is exposed to light from one direction, then it will ___________________

5. What will we measure in our experiment? Circle the correct answer:

How tall the plant grows

The direction the plant grows or bends

The colour of the leaves

6. To make our experiment fair, what should we keep the same for all plants?

Tick all that apply:

Same type of plant

Same amount of water

Same temperature

Different sized pots

📊 Part 3: Recording and Reflection

7. Draw or describe your plant's starting position:
8. Scientific vocabulary check! Match each term to its meaning:

Terms: Stimulus, Response, Receptor, Effector

Hint: One detects, one reacts, one is the cause, one is the effect

9. Extension Challenge: How is a plant responding to light similar to how your eye responds to bright light?
10. Success Check: Can you explain stimulus and response to a friend? Write one sentence for each:

Stimulus is: ________________________________

Response is: ________________________________

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