Diffusion, Osmosis And Active Transport Flashcards
What is diffusion?
The net movement of the particles of a liquid or gas from a region of high concentration to a region of low concentration, down a concentration gradient.
Is diffusion passive or active?
Passive because no energy is required
Why does diffusion take place?
Because of the existence of a concentration gradient and because of the natural and random motion of particles in liquids and gases
What is a concentration gradient?
A difference in concentration of a substance into different places
What does net movement mean?
Overall movement
What are the factors that affect the time for diffusion to take place?
Temperature (the higher the temperature the faster the particles move), concentration gradient (the steeper in the gradient the faster diffusion), the size of the particles (the larger particles the slower the diffusion), the thickness of any membrane (the thinner the membrane the faster the diffusion), the surface area of any membranes (the larger the surface area the faster the diffusion), pressure (the higher the pressure the faster the rate of diffusion).
What does there have to be for diffusion to occur through membranes?
A partially permeable membrane
What is osmosis?
The movement of water molecules from a region of high water concentration to a region of low water concentration (or from a region of high water potential to a region of low water potential)(Or in a solution: from an area of dilute solution to an area of concentrated solution) THROUGH A PARTIALLY PERMEABLE MEMBRANE
Is osmosis passive or active?
Passive as no energy is required.
What is active transport?
Active transport is the movement of particles, molecules or ions in or out of a cell, through the cell membrane, from the region of their low concentration, to a region of their high concentration. (Against a concentration gradient)
Is active transport active or passive?
Active as energy is required to transport the molecules, particles or ions against a concentration gradient. The energy produced in respiration is used.
How do minerals enter plants?
By active transport through root hat cells.
Describe the importance of water potential with the uptake of water in plants.
Plants make sure that their roots have a lower water potential than the soil around it so that they can uptake water via osmosis.
