What Does a Stoma do?

NGSS Phenomena: A green stoma on a plant as seen through an electron microscope. It's opening and closing and looks like a human eye.

Volodymyr Koman/MIT Chemical Engineering

Plants have small structures on their leaves called stoma that they use to take in gas and release water vapor. This gif is the work of researchers at MIT who discovered a way to see these microscopic parts actually opening and closing. Think about the path that water takes after it leaves this opening while you answer the questions that follow.

1. Plants let out water through their in a process called and take in water through their .

Drag the answers below into the grey placeholders above

evaporation

transpiration

stoma

roots

precipitation

condensation

stems

2. Additional energy is needed to take water from and energy needs to be taken away or lost in order for water to move from .

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liquid to a solid

solid to liquid

3. In the space below, draw a model to show how water that starts in the ocean gets inside this plant and where is goes after it leaves the plant.

Color

Width

4. Explain how your model shows how water that starts in the ocean gets inside this plant and where is goes after it leaves the plant.

5. Stoma can close, which allows plants to hold onto carbon dioxide and water. How will that impact the rate of photosynthesis in plants with stoma?

stoma will not impact the rate of photosynthesis in plants with stoma compared to plants without stoma
they are more effective at trapping the inputs of photosynthesis, so with sunlight, they will have lower rates of photosynthesis compared to plants without stoma
they are more effective at trapping the inputs of photosynthesis, so with sunlight, they will have higher rates of photosynthesis compared to plants without stoma
they are more effective at trapping the outputs of photosynthesis, so they will have higher rates of photosynthesis compared to plants without stoma

6. Draw a model in the space below to show a path that water might take as it leaves the stoma of this plant and travels through different stages until it reaches the ocean. Your model should make it clear if energy is lost or gained by water between each stage.

Color

Width

7. Explain in words how your model shows that energy is lost or gained by water as it leaves the stoma of this plant and travels through different stages until it reaches the ocean.

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What Does a Stoma do?

1. Plants let out water through their in a process called and take in water through their .

Drag the answers below into the grey placeholders above

2. Additional energy is needed to take water from and energy needs to be taken away or lost in order for water to move from .

Drag the answers below into the grey placeholders above

3. In the space below, draw a model to show how water that starts in the ocean gets inside this plant and where is goes after it leaves the plant.

4. Explain how your model shows how water that starts in the ocean gets inside this plant and where is goes after it leaves the plant.

5. Stoma can close, which allows plants to hold onto carbon dioxide and water. How will that impact the rate of photosynthesis in plants with stoma?

6. Draw a model in the space below to show a path that water might take as it leaves the stoma of this plant and travels through different stages until it reaches the ocean. Your model should make it clear if energy is lost or gained by water between each stage.

7. Explain in words how your model shows that energy is lost or gained by water as it leaves the stoma of this plant and travels through different stages until it reaches the ocean.

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MS-ESS2-4

ESS2.C: The Roles of Water in Earth’s Surface Processes

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Energy and Matter: Flows, Cycles, and Conservation

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ESS2.C: The Roles of Water in Earth’s Surface Processes

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MS-ESS2-6

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MS-PS2-5

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