Exchange of materials GCSE Biology AQA (higher)

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What is "osmosis"?
free movement of water molecules through a partially permeable membrane.
1 of 40
What is "diffusion"?
free movement of molecules down a concentration gradient.
2 of 40
Diffusion involves the movement of substances from ..........................
a high concentration to a low concentration
3 of 40
What is "active transport"?
movement of molecules through a partially permeable membrane involving energy
4 of 40
Osmosis involves the movement of water molecules from ..........................
a high concentration to a low concentration
5 of 40
Active Transport involves the movement of substances from ..........................
a low concentration to a high concentration
6 of 40
What do the lungs exchange with the atmosphere?
Oxygen and Carbon Dioxide
7 of 40
Why is oxygen needed?
for aerobic respiration
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Why is Carbon Dioxide exchanged?
it is a waste product of respiration
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Why is Nitric Oxide exchanged?
It isn't
10 of 40
What gives the lungs a large surface area?
alveoli
11 of 40
Give an adaptation of a villus for gas exchange
Thin walls
12 of 40
Give another adaption for (answer to Q11)
Moist surface
13 of 40
Where does Oxygen diffuse into?
Capillaries surrounding (answer to Q11)
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Where does Nitric Oxide diffuse into?
It doesn't
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Where does Carbon Dioxide diffuse into?
Back out into the lungs.
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What is in the Thorax?
The lungs
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Where does the absorption of digested food take place?
The small Intestine and the capillaries
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What is digested food absorbed by?
Capillaries in the villi
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What increases the surface area in the small intestine?
Villi.
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By what processes is digested food absorbed ?
diffusion and active transport
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Give an adaption of the villi for efficient absorption
rich blood supply
22 of 40
Give another adaption of the villi.
large surface area
23 of 40
Give another adaption of the villi.
Thin wall to prevent substances entering
24 of 40
what do living organisms need oxygen for?
aerobic respiration
25 of 40
Name one feature that gas exchange surfaces have in common.
large surface area
26 of 40
name another feature that gas exchange surfaces have in common.
gasses are transported away quickly to maintain a high concentration gradient.
27 of 40
name another feature that gas exchange surfaces have in common.
They are moist
28 of 40
name another feature that gas exchange surfaces have in common.
They have thin membranes to make it easier for gasses to diffuse
29 of 40
Why does a high concentration gradient need to be maintained?
so diffusion is quicker
30 of 40
What are the holes that gasses diffuse in and out of called in plant leaves?
stomata
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What is Carbon Dioxide needed for in plants?
photosynthesis
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What is oxygen needed for in plants?
respiration
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What do roots have to increase their surface area?
root hairs
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What is it called when water evaporates from the leaves?
transpiration
35 of 40
Where is the most water lost from?
the stomata
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What happens if too much water is lost from a plant ?
it will wilt
37 of 40
What controls the size of the stomata?
the guard cells
38 of 40
Why are stomata found on the lower surface of the leaf?
They are on the underside of the leaf so that they are not in the direct sun and are more sheltered.
39 of 40
Why is it or is it not necessary for the small intestine to have a rich blood supply?
So that digested food can be taken away quickly and efficiently.
40 of 40

Other cards in this set

Card 2

Front

What is "diffusion"?

Back

free movement of molecules down a concentration gradient.

Card 3

Front

Diffusion involves the movement of substances from ..........................

Back

Preview of the front of card 3

Card 4

Front

What is "active transport"?

Back

Preview of the front of card 4

Card 5

Front

Osmosis involves the movement of water molecules from ..........................

Back

Preview of the front of card 5
View more cards

Comments

Jimmy Boy

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good quiz, thanks :)

Swallowtail

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A useful little quiz that contains questions suited to AQA biology on gaseous exchange and absorption.  This topic is also found in specifications. Quizzes are useful to test your understanding after you have revised a topic or to show you which areas need more thorough revision.

Thiara Roops

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Where does the nitric oxide diffuse into......it doesn't.  

I smiled at that. 

Eloise.Littlewood

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The definition of diffusion is wrong, it says "down a concentration gradient" which is for active transport:

Active transport is the movement of dissolved molecules into or out of a cell through the cell membrane, from a region of lower concentration to a region of higher concentration. The particles move against the concentration gradient , using energy released during respiration.

Diffusion is actually:

Diffusion is the movement of a substance from an area of high concentration to an area of low concentration.

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