transport

Question 1

What is diffusion?

Answer 1

The passive movement of particles for a high concentration to a low concentration

Question 2

what can the rate of diffusion be changed by?

Answer 2

Altering concentration gradient, temperature and surface area

Question 3

for multicellular organisms, what are surfaces and organ systems specialised to do?

Answer 3

Exchange materials

Question 4

what is the effectiveness of an exchange surface increased by?

Answer 4

-Having a large surface area
-Thin membrane
-Efficient blood supply (in animals)
-Being ventilated (in animals for gas exchange)

Question 5

what is osmosis?

Answer 5

The passive movement of water from an area of higher water concentration to an area of lower water concentration across a partially permeable membrane

Question 6

what are mass changes caused by?

Answer 6

The movement of water across a plant cell membrane

Question 7

what is active transport and where does it get its energy from?

Answer 7

It uses energy from respiration to transport substances across a membrane from low concentration to high concentration

Question 8

where is active transport used and for what?

Answer 8

In root hair cells and this small intestine for the absorption of nutrients