lesson 11 pt 1

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Gas exchange in plant leaves occurs through ________, not bulk flow.

diffusion

How do plant leaves acquire resources through stomata?

By fixing CO2 into a 4-carbon sugar molecule

By risking water loss and stress from wind and heat. (correct)

By using bulk flow to acquire gases.

By controlling the size of the stomatal aperture through turgidity and solute potential.

What are the three learning outcomes related to plant leaves mentioned in the text?

Stomata function, leaf positioning, and stress impacts on leaf shapes (correct)

Chlorophyll content, leaf thickness, and temperature tolerance

Stomata density, leaf color, and stress tolerance

Leaf size, root depth, and water absorption

True or false: Diffusion is the mechanism by which gas exchange occurs in mammalian lungs.

False Signup and view all the answers

What are the three learning outcomes related to plant leaves mentioned in the text?

Stomata function, leaf positioning, and stress impacts on leaf shapes Signup and view all the answers

Gas exchange in plant leaves occurs through ________, unlike bulk flow in mammalian lungs.

diffusion Signup and view all the answers

How does gas exchange occur in plant leaves?

Through diffusion Signup and view all the answers

Stomata are the only gateways for ________ to enter inside the leaf, but they also allow water to escape, leading to water loss.

carbon dioxide Signup and view all the answers

What are stomata?

Gateways for CO2 to enter leaves. Signup and view all the answers

Stomata are gateways for CO2 but also cause water loss, and guard cells control ________ size.

aperture Signup and view all the answers

True or false: Water loss is not a concern for plant leaves during photosynthesis.

False Signup and view all the answers

How does gas exchange occur in plant leaves?

Through diffusion Signup and view all the answers

True or false: Stomata allow both carbon dioxide and oxygen to enter inside the leaf.

False Signup and view all the answers

How do mammalian lungs acquire gases?

Through bulk flow. Signup and view all the answers

What are stomata and what is their function?

They are guard cells that control water loss in plant leaves Signup and view all the answers

What are stomata and what is their function?

Gateways for CO2 but also cause water loss, and guard cells control aperture size Signup and view all the answers

Guard cells control the size of stomatal apertures and are affected by the concentration of ________, potassium ions, and the solute potential of the cells.

sucrose Signup and view all the answers

Optimal stomatal density is controlled by signaling molecules to maximize ________ diffusion.

CO2 Signup and view all the answers

How do guard cells control stomatal aperture?

Through changes in turgidity Signup and view all the answers

How have stomata improved in minimizing water loss and optimizing carbon gain?

By controlling the size of the stomatal aperture through turgidity and solute potential. Signup and view all the answers

True or false: Guard cells are not affected by the concentration of sucrose and potassium ions.

False Signup and view all the answers

The optimal stomatal density that maximizes rates of CO2 diffusion while minimizing water loss is tightly controlled by ________.

plants Signup and view all the answers

How do guard cells control stomatal aperture?

Through turgidity changes Signup and view all the answers

Changes in CO2 concentration have led to changes in stomatal density ________ time.

over Signup and view all the answers

True or false: Plants do not have precise control over stomatal density.

False Signup and view all the answers

What is the optimal stomatal density controlled by?

Signaling molecules to maximize CO2 diffusion Signup and view all the answers

Plants regulate stomatal density through signaling molecules that prevent neighboring epidermal cells from becoming ________ cells.

guard Signup and view all the answers

Rubisco inefficiency leads to ________, but plants have developed alternative pathways.

photorespiration Signup and view all the answers

What is the role of guard cells in stomatal function?

To control the size of the stomatal aperture Signup and view all the answers

How is optimal stomatal density controlled?

Through signaling molecules Signup and view all the answers

C4 plants use a different pathway for photosynthesis to reduce photorespiration and ________ loss.

water Signup and view all the answers

Rubisco, the enzyme responsible for carbon fixation, is inefficient and can bind to oxygen, causing ________, which reduces water loss.

photorespiration Signup and view all the answers

True or false: Rubisco is a highly efficient enzyme responsible for carbon fixation.

False Signup and view all the answers

What has led to changes in stomatal density over time?

Changes in CO2 concentration Signup and view all the answers

What has led to changes in stomatal density over time?

Changes in CO2 concentration Signup and view all the answers

How is stomatal density controlled in leaves?

To ensure net CO2 diffusion into the leaf. Signup and view all the answers

C4 plants have a different anatomy and pathway for photosynthesis that reduces rates of ________ and water loss.

photorespiration Signup and view all the answers

How do plants adjust stomatal density?

As a function of CO2 concentration in the air. Signup and view all the answers

What is photorespiration and what causes it?

It is a process that produces carbon dioxide and is caused by Rubisco inefficiency Signup and view all the answers

What does Rubisco inefficiency lead to?

Photorespiration Signup and view all the answers

CAM plants fix CO2 into 4-carbon sugar molecules exclusively at ________ to reduce water loss.

night Signup and view all the answers

True or false: C4 plants and CAM plants have the same anatomy and pathway for photosynthesis.

False Signup and view all the answers

How do C4 plants reduce photorespiration and water loss?

By using a different pathway for photosynthesis Signup and view all the answers

How do C4 plants reduce photorespiration and water loss?

By using a different pathway for photosynthesis Signup and view all the answers

True or false: Photorespiration reduces water loss in plant leaves.

False Signup and view all the answers

What is Rubisco and why is it inefficient?

Rubisco is an enzyme that fixes carbon in photosynthesis but readily binds to oxygen, leading to photorespiration. Signup and view all the answers

Plant leaves acquire CO2 and light, but are at risk of water loss and ________.

stress. Signup and view all the answers

CAM plants fix carbon dioxide into a ________ sugar molecule exclusively at night to reduce water loss, but there is a limit to how much CO2 they can sequester.

4-carbon Signup and view all the answers

Plant leaves acquire carbon dioxide and light for photosynthesis but are at risk of excessive water loss and stress from ________ and thermal factors.

wind Signup and view all the answers

How do C4 plants differ from C3 plants?

C4 plants fix CO2 into a 4-carbon sugar molecule and lose half as much water as C3 plants. Signup and view all the answers

True or false: CAM plants exclusively fix carbon dioxide into a 3-carbon sugar molecule at night.

False Signup and view all the answers

What is the strategy of CAM plants to minimize water loss?

Fix CO2 into a 4-carbon sugar molecule at night. Signup and view all the answers

True or false: Wind and thermal stress do not affect the shape of plant leaves.

False Signup and view all the answers

The lecture covers the basic functioning of stomata, the importance of leaf positioning and crown architecture, and the impact of ________ and thermal stress on leaf shapes.

wind Signup and view all the answers

lesson 11 pt 1

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Questions and Answers

Gas exchange in plant leaves occurs through ________, not bulk flow.

How do plant leaves acquire resources through stomata?

What are the three learning outcomes related to plant leaves mentioned in the text?

True or false: Diffusion is the mechanism by which gas exchange occurs in mammalian lungs.

What are the three learning outcomes related to plant leaves mentioned in the text?

Gas exchange in plant leaves occurs through ________, unlike bulk flow in mammalian lungs.

How does gas exchange occur in plant leaves?

Stomata are the only gateways for ________ to enter inside the leaf, but they also allow water to escape, leading to water loss.

What are stomata?

Stomata are gateways for CO2 but also cause water loss, and guard cells control ________ size.

True or false: Water loss is not a concern for plant leaves during photosynthesis.

How does gas exchange occur in plant leaves?

True or false: Stomata allow both carbon dioxide and oxygen to enter inside the leaf.

How do mammalian lungs acquire gases?

What are stomata and what is their function?

What are stomata and what is their function?

Guard cells control the size of stomatal apertures and are affected by the concentration of ________, potassium ions, and the solute potential of the cells.

Optimal stomatal density is controlled by signaling molecules to maximize ________ diffusion.

How do guard cells control stomatal aperture?

How have stomata improved in minimizing water loss and optimizing carbon gain?

True or false: Guard cells are not affected by the concentration of sucrose and potassium ions.

The optimal stomatal density that maximizes rates of CO2 diffusion while minimizing water loss is tightly controlled by ________.

How do guard cells control stomatal aperture?

Changes in CO2 concentration have led to changes in stomatal density ________ time.

True or false: Plants do not have precise control over stomatal density.

What is the optimal stomatal density controlled by?

Plants regulate stomatal density through signaling molecules that prevent neighboring epidermal cells from becoming ________ cells.

Rubisco inefficiency leads to ________, but plants have developed alternative pathways.

What is the role of guard cells in stomatal function?

How is optimal stomatal density controlled?

C4 plants use a different pathway for photosynthesis to reduce photorespiration and ________ loss.

Rubisco, the enzyme responsible for carbon fixation, is inefficient and can bind to oxygen, causing ________, which reduces water loss.

True or false: Rubisco is a highly efficient enzyme responsible for carbon fixation.

What has led to changes in stomatal density over time?

What has led to changes in stomatal density over time?

How is stomatal density controlled in leaves?

C4 plants have a different anatomy and pathway for photosynthesis that reduces rates of ________ and water loss.

How do plants adjust stomatal density?

What is photorespiration and what causes it?

What does Rubisco inefficiency lead to?

CAM plants fix CO2 into 4-carbon sugar molecules exclusively at ________ to reduce water loss.

True or false: C4 plants and CAM plants have the same anatomy and pathway for photosynthesis.

How do C4 plants reduce photorespiration and water loss?

How do C4 plants reduce photorespiration and water loss?

True or false: Photorespiration reduces water loss in plant leaves.

What is Rubisco and why is it inefficient?

Plant leaves acquire CO2 and light, but are at risk of water loss and ________.

CAM plants fix carbon dioxide into a ________ sugar molecule exclusively at night to reduce water loss, but there is a limit to how much CO2 they can sequester.

Plant leaves acquire carbon dioxide and light for photosynthesis but are at risk of excessive water loss and stress from ________ and thermal factors.

How do C4 plants differ from C3 plants?

True or false: CAM plants exclusively fix carbon dioxide into a 3-carbon sugar molecule at night.

What is the strategy of CAM plants to minimize water loss?

True or false: Wind and thermal stress do not affect the shape of plant leaves.

The lecture covers the basic functioning of stomata, the importance of leaf positioning and crown architecture, and the impact of ________ and thermal stress on leaf shapes.

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