Plant transport Flashcards
What is diffusion
The movement of particles in a gas or liquid from an area of high tom low concentration
Factors affecting diffusion
Temperature
Concentration gradient (the difference in concentration between two areas. The bigger the difference, the faster the rate of diffusion)
Membrane surface area (The bigger the surface area to volume ratio, the faster the rate of diffusion)
How did root hair cells adapt to absorb more water and nutrients
The large surface area of the root hair cells increases the rate of diffusion and allows more water and nutrients to enter the plant
What is osmosis
Osmosis is the diffusion of water across a partially permeable membrane from a dilute to concentrated solution (something that allows water through, but not larger molecules dissolved in the water)
What is a root hair cell
A specialised plant tissue that uses osmosis to absorb water
What is active transport
The process where molecules move from a less concentrated solution to a more concentrated solution
Why does active transport need energy
Because it is moving against the concentration gradient
Examples of absorption through active transport
Sugars in the guts of humans
Minerals in the roots of plants
What are examples of passive transport
Osmosis and diffusion
What is passive transport
A random movement towards a lower concentration and does not require energy to accomplish the movement.
What is active transport TN
The net movement of molecules against a concentration gradient. This requires energy
