Sunflower turning towards the sun, demonstrating phototropism.

Let’s go through each question one by one and solve them step by step.

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Question 1: What is tropism?

Tropism is the growth or movement of a plant in response to a stimulus (like light, gravity, water, etc.).

So we fill in:
> Tropism is the growth/movement of a plant in response to a stimulus.

*(Note: “Growth” is more accurate for most tropisms — plants don’t usually move their whole body, they grow toward or away from something.)*

✔ Final answer for Q1:
growth, stimulus

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Question 2: What is the plant below called? What type of tropism is this?

The image shows a sunflower facing the sun.

- The plant is a sunflower.
- Responding to the Sun means it’s growing toward light → that’s called phototropism.

So:
> This is a sunflower.
> Responding to the Sun is called phototropism.

✔ Final answers for Q2:
sunflower, phototropism

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Question 3: What is a plant’s response to gravity called?

Let’s look at the options:

a. gravotropism — not a real word (though sounds close)
b. geotropism — YES! This is the correct term. Sometimes also called “gravitropism”, but “geotropism” is listed here and is correct.
c. phototropism — that’s response to light
d. hydrotropism — that’s response to water

✔ Correct answer: b. geotropism

*(Note: In modern science, “gravitropism” is often used, but since “geotropism” is an accepted synonym and it’s the only correct option here, we pick b.)*

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Question 4: Circle the part of the plant that experiences the most hydrotropism.

Hydrotropism = growth in response to water.

Roots are the part of the plant that seek out water in the soil. So even though the whole plant might be affected slightly, the roots show the strongest hydrotropism.

In the diagram, you should circle the roots (the underground part).

✔ Final answer for Q4: Circle the roots

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Now let’s put all final answers together clearly.

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Final Answer:
1. growth, stimulus
2. sunflower, phototropism
3. b. geotropism
4. Circle the roots