Transport in plants #51

• What is the process by which plants transport sugars?

  Translocation
• How do plants transport water?

  Through transpiration
• Where does photosynthesis occur in plants?

  In the leaves
• What are phloem cells primarily responsible for?

  Transporting sugars
• How are phloem cells arranged to facilitate transport?

  End to end to form phloem tubes
• What do the small pores between phloem cells allow for?

  Movement of cell sap
• What is cell sap composed of?

  A liquid mixture of water and sugar
• What can sugars be used for once transported to cells?

  For energy or stored for later
• In which directions can phloem transport substances?

  Up or down the plant
• What are xylem tubes primarily responsible for?

  Transporting water and mineral ions
• How are xylem cells different from phloem cells?

  Xylem cells are dead and form hollow tubes
• What strengthens xylem tubes?

  Lignin
• What drives the movement of water through a plant?

  Evaporation of water from leaves
• How does evaporation from leaves affect water movement?

  It drags the water chain up
• What is the term for the evaporation of water from leaves?

  Transpiration
• What is the transpiration stream?

  The chain of water molecules moving up
• What factors influence the rate of transpiration?

  Light intensity, temperature, airflow, humidity
• How does light intensity affect transpiration?

  Higher light increases photosynthesis and transpiration
• How does temperature affect the rate of transpiration?

  Warmer temperatures increase evaporation rates
• How does airflow affect transpiration?

  High airflow increases the concentration gradient
• How does humidity affect the rate of transpiration?

  Higher humidity decreases the concentration gradient
• What happens to transpiration at night?

  Transpiration decreases due to closed stomata
• Why do stomata need to be open during the day?

  To let in carbon dioxide for photosynthesis
• What is the effect of wind on transpiration?

  It increases the rate of transpiration
• What is the relationship between transpiration and photosynthesis?

  Transpiration allows for gas exchange needed for photosynthesis
• How does the concentration gradient affect water diffusion from leaves?

  A higher gradient increases the rate of diffusion
• What happens to transpiration when humidity is high?

  Transpiration decreases due to lower gradient
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• What will happen next time after this video?

  See you next time