1.10 exchanging materials

Question 1

What kind of surface area do single celled organisms have?

Answer 1

Single celled organisms have a relatively large surface area to avoid ratio so all necessary exchanges with the environment take place over the surface

Question 2

How organs specialised in multicellular organisms?

Answer 2

In multicellular organisms, many organisms specialised with effective exchange surfaces

Question 3

What kind of surface area and walls to exchange surfaces have?

Answer 3

Exchange surfaces usually have a large surface area and thin walls, this gives short diffusion distances.

Question 4

What properties do exchange surfaces in animals have?

Answer 4

In animals, exchange surfaces will have an efficient blood supply or gaseous exchange be ventilated

Question 5

What does ventilated mean?

Answer 5

Movement of air of water into and out of the gas exchange organ, for example, lungs or gills

Question 6

What is stomata?

Answer 6

Openings in the leaves of plants, particularly on the underside and opened and closed by guard cells, allowing gases to enter and leave the leaf