Plants Flashcards
Define osmosis:
Diffusion of water through a partial permeable membrane
Define diffusion:
Movement of a substance from high to low concentration until equal concentrations
Define active transport:
Diffusion against the concentration gradient - low to high - requires energy
What are plant cells normally:
Turgid
What do plant cells become with nearly enough water:
Flaccid
What do plant cells become without enough water:
Plasmolyzed
Where does diffusion occur:
Alveoli (oxygen and carbon dioxide)
Villi (small soluble food particles)
Where does osmosis occur:
Root hair cells
Large intestine
Where does active transport occur:
Root hair cells (minerals)
All products of digestion
Factors that affect diffusion:
Temperature, concentration, surface area
Factors that affect osmosis:
Temperature, concentration, surface area
Factors that affect active transport:
Temperature, surface area
What are vascular bundles:
Bundles of small tubes - xylem and phloem tubes
What are xylem tubes:
Dead cells (the ends have broken down) that have thick, rigid walls
What are phloem tubes:
Live cells that sieve the solution that passes through them, with companion cells to assist active transport
There will be some stuff on:
Stomata
Where does the transpiration stream come from and go:
Water evaporates through the stomata
Water leaves the xylem through osmosis
Water is pulled up the xylem to replace the lost water
Water is pulled in through the roots to replace the previous water through osmosis
