Unit 8 - Transport in Plants Flashcards
xylem and phloem, water uptake, transpiration, translocation
What does xylem transport
water and ions / salts
what does phloem transport
sucrose and amino acids
3 ways xylem vessels are adapted for their function
- no cell walls on top of bottom of xylem cells
- no cell contents
- cell walls are tough as they are made of lignin
where does water move through a plant
soil -> root hair cells -> root cortex cells -> transported through xylem vesseks around the plant -> mesophyll layer of leaves -> evaporates out through stomata into atmosphere
in terms of water potential what happens when water evaporates out stomata
causes water potential in leaf to decrease
transpiration definition
the loss of water vapour from leaves
what causes plants to wilt
if more water evaporates from a plant than can be absorbed from soil, plant cells will become flaccid causing plant to wilt
what allows water to move up xylem vessels like water up a straew
cohesion of water and adhesion to the walls of xylem vessels
what is transpiration
movement of amino acids and sucrose through phloem vessels
where do amino acids move in a plant
from source to sink
what is source in a plant
where plant release sucrose and amino acids
what is sink in ploants
where plants store or use sucrose and amino acids
what direction/s can phloem transport nutrients
any direction
carbs in plants - produced, transported, stored, used
produced by photosynthesis as glucose, transported as sucrose, stored as starch, used for respiration as glucose
