6.2.2 Stomata and Gas Exchange

• What are stomata?

  Small pores on leaves
• Match the process with its requirement for stomata:

  Photosynthesis ↔️ CO2 uptake

  Respiration ↔️ O2 release
• Stomata are composed of guard cells and pores
• Stomata are surrounded by guard cells that regulate gas flow


  True
• Match the stomata state with its gas exchange level:

  Open ↔️ High

  Closed ↔️ Low
• Stomata open in response to dehydration

  False
• What happens to guard cells when stomata are open?

  They become turgid
• What two processes depend on stomata for gas exchange?

  Photosynthesis and transpiration
• Guard cells become flaccid when stomata open

  False
• Stomata close when carbon dioxide levels inside the leaf are high

  False
• When guard cells lose water, they become flaccid
• Guard cells control the opening and closing of stomata.

  True
• Steps in the opening and closing of stomata

  1️⃣ Guard cells become turgid

  2️⃣ Turgor pressure increases

  3️⃣ Stomata open

  4️⃣ Guard cells lose water

  5️⃣ Turgor pressure decreases

  6️⃣ Stomata close
• Pores formed by guard cells allow gases to enter and exit
• What stomatal response occurs in high humidity?

  Stomata open
• Why do stomata close during water scarcity?

  To conserve water
• Carbon dioxide enters through stomata for photosynthesis.


  True
• Steps in the role of stomata during photosynthesis

  1️⃣ Carbon dioxide enters through stomata

  2️⃣ Carbon dioxide is used to produce glucose

  3️⃣ Oxygen is released as a byproduct

  4️⃣ Oxygen exits through stomata
• When guard cells are turgid, stomata open to allow gas exchange.

  True
• High humidity reduces the need for water conservation
• How does light intensity affect stomata opening?

  Promotes turgor pressure
• Why do stomata open under high humidity conditions?

  Reduce water loss
• What happens to guard cells when they are turgid?

  They swell and open stomata
• What gas is released as a byproduct of photosynthesis through stomata?

  Oxygen
• Woody plants have fewer, larger stomata that respond more slowly to environmental changes.

  True
• Stomata facilitate the uptake of CO2 for photosynthesis
• Higher light intensity encourages stomata to open
• Stomata release water vapor during gas exchange

  True
• Stomata facilitate gas exchange
• What happens to stomata when guard cells are flaccid?

  Stomata close
• Which gas exits stomata?

  Oxygen
• What are the specialized cells surrounding stomatal pores called?

  Guard cells
• Stomata close during dehydration to conserve water.


  True
• What happens to guard cells when CO2 levels inside the leaf are low?

  Stomata open
• Steps in gas exchange through stomata

  1️⃣ Carbon dioxide enters stomata

  2️⃣ Guard cells control pore size

  3️⃣ Oxygen and water vapor exit stomata
• Stomata are small pores on the leaf surfaces, essential for gas exchange
• In photosynthesis, stomata allow carbon dioxide to enter the leaf.


  True
• Match the gas with its role in photosynthesis and respiration:

  Carbon Dioxide ↔️ Used in photosynthesis, released in respiration

  Oxygen ↔️ Released in photosynthesis, used in respiration
• Stomata play a crucial role in photosynthesis and transpiration
• Guard cells control stomatal opening based on turgor pressure