plants

• what would happen to the rate of transpiration if you increase the humidity?

  -decrease the rate

  • due to the reduced concentration gradient which leads to a lower rate of diffusion
• what would happen to the rate of transpiration if you increase the temp?

  -increased rate

  • due to molecules moving faster leading to more evaporation
  • rate of photosynthesis would increase leading to more stomata open
• what would happen to the rate of transpiration if you increase the air movement?

  -increase rate

  • steeper concentration gradient leading to an increase in diffusion
• what would happen to the rate of transpiration if you increase the light intensity?

  -increased rate

  • increase in photosynthesis so more stomata open so more evaporation
• where is the phloem found?

  Stems, Roots, Leaves
• where is the Xylem found?

  Stems, Roots, Leaves
• what features does the Phloem have?

  -Thin cell walls made of cellulose

  -two way flow : food moved underground for storage (translocation)
• what features does the xylem have?

  -thick cell wall of lignin makes it waterproof

  -one way flow from roots to leaves for evaporation (transpiration)

  -no cell walls in between the tube

  -made of dead cells
• where is the epidermis found?

  covering the whole plant
• where is the palisade mesophyll found?

  underneath the epidermis
• where is the spongy mesophyll found?

  underneath the palisade mesophyll
• why does the epidermis have a waxy cuticle?

  To help reduce water loss by evaporation
• why does the palisade mesophyll have lots of chloroplasts?

  For photosynthesis, they are positioned near the top as they receive lots of light
• why does the spongy mesophyll have lots of air spaces?

  allows diffusion
• why do the guard cells open?

  They open when the cell is filled with water which allows it to change shape for evaporation
• what is translocation?

  the movement of food substances up and down the phloem for storage or use
• what is transpiration?

  the evaporation of water through the leaves or stem
• where are stem cells found in plants?

  meristem