Biology- yr10 unit 1

• What is a xylem?


  A vascular tissue that transports water and minerals from the roots to the stems and the leaves
• What is a phloem?


  plant vascular tissue that conducts foods made in the leaves during photosynthesis to all other parts of the plant
• What do root hair cells do?

  Enlarge surface area
• What is transpiration? 


  the loss of water vapour from plant leaves by evaporation of water at the surfaces of the mesophyll cells followed by diffusion

  of water vapour through the stomata
• How is the xylem adapted?

  It has lignin (wood) walls and it becomes hollow to form a continuous tube
• What is a stomata?


  A hole that opens and closes depended on the state the plant is in
• What is a guard cell?


  Opens and closes the stomata
• What is translocation?


  Moves food substances from leaves to rest of plant and from stores such as in the roots. Columns of living cells.
• What direction is xylem flow in?

  One direction
• What direction is phloem flow in?

  All directions
• What are mesophyll cells?

  Mesophyll is the internal ground tissue located between the two epidermal cell layers of the leaf;
• What do mesophyll cells do?

  gas exchange and light absorption