Diffusion and Osmosis Flashcards
Adaptions of plants?
- large surface area
- thin so carbon dioxide does not have to travel far
What is diffusion?
spreading of particles from an area of high concentration to an area of low concentration down a concentration gradient
Adaptions of the villi?
- large surface area
- thin walls
- good blood supply
What factor affect the rate of diffusion?
surface area
temperature
concentration gradient
What is required of a good gas exchange?
- large surface area
- short diffusion pathway
- good blood supply
What is osmosis?
diffusion of water from a dilute solution to a concentrated solution through a partially permeable membrane
What is active transport?
movement of substances down a concentration gradient
What process requires energy from respiration?
active transport
Percentage change in mass
change in mass / initial mass x 100
Why do you need to cut the potatoes in even sizes?
same surface area
Why is it important to dry the potatoes chips before recording their masses?
to make sure only the mass of the potato is being recorded to make the investigation accurate
How does temperature affect the rate of diffusion?
higher the temperature, the faster the rate of diffusion
particle gain kinetic energy and diffuse in and out of cells more quickly
How does surface area affect the rate of diffusion?
the larger the surface area, the faster the rate diffusion
more particles can diffuse in and out of the cell
How does the concentration gradient affect the rate of diffusion?
the more steeper the concentration gradient, the faster the rate of diffusion
Explain the adaptions of the alveoli?
large surface area for gas exchange
sone cell thick create a short diffusion path so carbon dioxide does not have to diffuse far into the leaf
good blood supply to maintain a concentration gradient
