3.1.3 Gas exchange in plants

• Guard cells control the opening and closing of stomata based on environmental conditions
• What role do air spaces play in gas exchange in plants?

  Facilitate gas diffusion
• Guard cells become turgid in light, causing the stomata to open.


  True
• Arrange the conditions and their effects on guard cells and stomata:

  1️⃣ High light: Guard cells become turgid, stomata open

  2️⃣ Low light: Guard cells become flaccid, stomata close

  3️⃣ Dry environment: Guard cells become flaccid, stomata close
• What are stomata and where are they located?

  Small openings on leaf surfaces
• Mesophyll cells utilize CO₂ from stomata to carry out photosynthesis.


  True
• Stomata facilitate the intake of CO₂ needed for photosynthesis
• Why is the regulation of stomatal opening and closing crucial for plants?

  Balances gas exchange with water loss
• Guard cells become flaccid when they lose water and expel potassium ions
• What gases do stomata allow plants to exchange?

  CO₂ and O₂
• Guard cells regulate gas exchange based on light, humidity, and CO₂ levels.


  True
• What is the primary function of stomata?

  Gas exchange
• Stomata open when guard cells become turgid
• The regulation of stomata is crucial for balancing gas exchange with water loss prevention.


  True
• What organelle within mesophyll cells is responsible for photosynthesis?

  Chloroplast
• How do mesophyll cells and air spaces contribute to gas exchange?

  Enable CO₂ diffusion
• Match the structure with its function in gas exchange:

  Stomata ↔️ Small openings for gas exchange

  Guard cells ↔️ Control stomatal opening and closing

  Mesophyll cells ↔️ Carry out photosynthesis

  Air spaces ↔️ Facilitate gas diffusion
• Guard cells control the opening and closing of stomata
• Match the structure with its function:

  Stomata ↔️ Facilitate gas exchange

  Guard cells ↔️ Control stomatal opening

  Mesophyll cells ↔️ Carry out photosynthesis

  Air spaces ↔️ Enable gas diffusion
• Order the steps involved in stomatal regulation:

  1️⃣ Light increases guard cell turgidity

  2️⃣ Stomata open to allow CO₂ intake

  3️⃣ Guard cells become flaccid in dry conditions

  4️⃣ Stomata close to conserve water
• Air spaces in mesophyll tissue facilitate CO₂ diffusion to chloroplasts.

  True
• C4 plants fix CO₂ into a 4-carbon compound in mesophyll cells.