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Aqa GCSE Biology B3 Question and answers rated A+ 2024

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Aqa GCSE Biology B3 Question and answers rated A+ 2024 What is Osmosis? - correct answer It is the diffusion of water through a semi (partially) permeable membrane. the movement of water molecules from an area of high concentration to low. What are Isotonic drinks (sports drinks)? - correct ...

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  • August 27, 2024
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  • 2024/2025
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Aqa GCSE Biology B3
What is Osmosis? - correct answer ✔It is the diffusion of water through a
semi (partially) permeable membrane. the movement of water molecules from
an area of high concentration to low.


What are Isotonic drinks (sports drinks)? - correct answer ✔Isotonic drink are
drinks that contains a similar level of sugar, ions and water of that of human
body. The sugar replaces the amount of sugar released during exercise, and
the water and ions replaces the water and ions that are lost via sweating.


What two ways are materials exchanged in humans? - correct answer ✔1)
Villi in the small intestine
2) Alveoli in the lungs


What makes the villi so effective at exchanging materials in humans? - correct
answer ✔It has a large surface area. It also has an extensive network of
blood capillaries which help absorb products of digestion. The capillaries help
to maintain the concentration gradient.


Capillaries have very thin walls, why is this good for exchange of materials in
the human body? - correct answer ✔It is good as it provides a short diffusion
path.


What are Alveoli's? - correct answer ✔Are at the end of each bronchiole
there is an area that leads to little clumps of tiny air sacks where the exchange
of carbon dioxide and oxygen takes place.


What maximizes the exchange in the alveoli? - correct answer ✔Large
surface area (due to there being millions of alveoli in the lungs) so there is
larger surface area for the exchange of materials.

, They have an excellent supply of blood due to the capillaries being so close to
the surface (short diffusion pathway).


How are substances exchanged in the alveoli? - correct answer ✔by
diffusion


What diffuses in and out of the alveoli? - correct answer ✔Carbon dioxide
diffuses out from the blood into the alveoli.
Oxygen diffuses in to the blood from the alveoli.


What happens to the rib-cage and diaphragm during inspiration (breathing
in)? - correct answer ✔The ribs move up and out due to the intercostal
muscle contracting. The diaphragm also contracts and flattens.


What happens to the rib-cage and diaphragm during expiration (breathing
out)? - correct answer ✔The rib cages move down and in as the intercostal
muscle relaxes. The diaphragm also relaxes but moves upwards.


What does the stomata allow? - correct answer ✔Allows the exchange of
carbon dioxide and oxygen by diffusion. It also allows the loss of water
vapour.


What is transpiration? - correct answer ✔Is the loss of water vapour from the
stomata in a plant


What is the prime condition for Transpiration? - correct answer ✔A warm, dry
and windy condition.


How does light affect Transpiration? - correct answer ✔Transpiration
increases in bright light as the stomata opens wider in increased light.

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