Podcast
Questions and Answers
During the daytime, how do mesophyll cells manage oxygen and carbon dioxide during photosynthesis and respiration?
During the daytime, how do mesophyll cells manage oxygen and carbon dioxide during photosynthesis and respiration?
- They utilize oxygen produced in photosynthesis for cellular respiration, and carbon dioxide produced during cellular respiration for photosynthesis. (correct)
- They store all carbon dioxide produced during cellular respiration for nighttime use.
- They release all oxygen produced during photosynthesis into the environment.
- They halt cellular respiration to maximize the efficiency of photosynthesis.
What is the primary function of lenticels in woody stems and mature roots?
What is the primary function of lenticels in woody stems and mature roots?
- To allow for gaseous exchange through the bark. (correct)
- To protect the plant from physical damage.
- To store excess nutrients for the plant.
- To facilitate water absorption from the environment.
How do aquatic plants obtain oxygen and release carbon dioxide?
How do aquatic plants obtain oxygen and release carbon dioxide?
- They obtain oxygen dissolved in water and release carbon dioxide into the water. (correct)
- They produce their own oxygen through specialized photosynthetic cells and do not release carbon dioxide.
- They absorb oxygen and release carbon dioxide directly through their roots.
- They extract oxygen from the soil and release carbon dioxide into the air.
What is the main purpose of the stomata found in the epidermis of leaves?
What is the main purpose of the stomata found in the epidermis of leaves?
A researcher is investigating the effect of different light intensities on a plant's gas exchange. What measurement would provide the MOST direct evidence of net gaseous exchange?
A researcher is investigating the effect of different light intensities on a plant's gas exchange. What measurement would provide the MOST direct evidence of net gaseous exchange?
Flashcards
Cuticle
Cuticle
A waxy layer covering the leaf's surface, reducing water loss.
Mesophyll Cells
Mesophyll Cells
Cells in the leaf where photosynthesis and respiration occur.
Stomata
Stomata
Pores in the epidermis of leaves that facilitate gas exchange and water vapor release.
Guard Cells
Guard Cells
Signup and view all the flashcards
Lenticels
Lenticels
Signup and view all the flashcards
Study Notes
- Gaseous exchange occurs in leaves.
- Leaf cells experience two different scenarios related to gas exchange.
- The microscopic pores in the epidermis of leaves are called stomata, which serve as passageways for gases and water vapor.
- The opening and closing of stomata controls the gas exchange.
Daytime gas exchange in leaf cells
- Mesophyll cells conduct photosynthesis and respiration concurrently.
- Oxygen, produced by photosynthesis, is then used in cellular respiration.
- Carbon dioxide, produced during cellular respiration, is used in photosynthesis.
Nighttime gas exchange in leaf cells
- Because there is no photosynthesis occurring during the night, leaf cells take in oxygen from the environment.
- Leaf cells release carbon dioxide through the stomata.
Gas exchange in woody stems and roots
- Woody stems and mature roots are covered by bark, which is impermeable to gases and water.
- Lenticels are pores in the bark that allow air to pass through.
- Lenticels are slightly more raised than the general surface of the stem.
Gas exchange in roots
- Gases diffuse in and out of the young roots surface.
- Gases are located in the soil surrounding the roots.
Gas exchange in aquatic plants
- Aquatic plants obtain oxygen dissolved in the water.
- Aquatic plants release carbon dioxide into the water.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
