Diffusion, Osmosis, Active Transport and Photosynthesis

Question 1

What is Diffusion?

Answer 1

The spreading out of particles from an area of high concentration to an area of lower concentration.

Question 2

In what substances does Diffusion take place?

Answer 2

Happens in solutions and gases as particles in these substances are free to move about randomly

Question 3

What is the simplest type of diffusion?

Answer 3

When gases diffuse through each other for e.g. when the smell of perfume diffuses through the air of a room

Question 4

What can affect the rate of diffusion?

Answer 4

The bigger the concentration gradient )the difference in concentration) the faster the diffusion.
The higher the temperature because particles will have more energy
The larger the surface area the faster the diffusion rate because more particles can pass through at once.

Question 5

What do Cell Membranes do?

Answer 5

They hold the cell together but they let dissolved substances in and out the cell by diffusion. Only very small molecules can diffuse like oxygen, glucose, amino acids and water. Big Molecules like starch and proteins cant fit through the membrane.

Question 6

How do particles diffuse through the Cell Membrane?

Answer 6

Particles flow through the cell membrane from where there’s a higher concentration to a lower concentration where they move about randomly going both ways.
If there a lot more particles on one sides of membrane there’s a net overall movement from that side

Question 7

State an Example of Diffusion

Answer 7

Dissolved substances moving in and out of your cells

O2 passing from the air in your lungs into your red blood cells.