WorksheetsB1 Exchange Surfaces
Total questions: 10
Worksheet time: 8mins
Name
Class
Date
1.
How do you calculate a surface area to volume ratio (SA: V)
4 lines
2.
What is an exchange surface?
a)
A specialised area of an organism that efficiently transfers substances between the organism and its environment.
b)
A specialised area of an organism that efficiently transfers substances between the organism and itself.
3.
Why don't single-celled organisms need exchange surfaces?
a)
They have a large surface area to volume ratio meaning substances can easily diffuse into their cells.
b)
They have a small surface area to volume ratio meaning substances can sometimes diffuse into their cells.
4.
Why do multi-cellular organisms need exchange surfaces?
a)
They have a small surface area to volume ratio. They need an exchange surface such as lungs to transfer substances efficiently.
b)
They have a large surface area to volume ratio. They do not need an exchange surface such as lungs to transfer substances efficiently.
5.
Give FOUR adaptations of exchange surfaces that increase their effectiveness.
a)
Large surface area.
b)
Thin membrane
c)
Rich blood supply (in animals)
d)
Gas exchange surfaces are exposed to the air (in animals)
e)
Small surface area to volume ratio
6.
Give THREE ways that the small intestine is adapted for exchanging surfaces
a)
Walls are folded and have millions of projections called villi to give a huge surface area.
b)
Villi have very thin walls.
c)
Villi have a rich blood supply.
d)
Villi have thick membranes
7.
Give THREE ways that alveoli are adapted for gas exchange.
a)
Thin walls
b)
A rich blood supply
c)
Large surface area.
d)
Folded into spiral shapes
8.
Give TWO ways that plant leaves are adapted for gas exchange.
a)
Openings in epidermal tissue called stomata let gases in and out of the leaf.
b)
Air spaces inside leaf tissues allow gases to diffuse in and out of cells.
c)
Transpiration lets oxygen escapre through these stomata
9.
How does the structure of a fish's gills help it to exchange gases with water?
a)
Gills are made up of lots of gill filaments which are covered many folds called lamella. This provides a large surface area which increases the rate of difusion of gases between the fishe's blood and water.
b)
Gills are made up of lots of gill filaments which are covered many folds called lamella. This provides a small surface area which increases the rate of difusion of gases between the fishe's blood and water.
10.
Give THREE ways that the lamellae in a fish's gills are adapted for exchanging gases with water.
a)
Thin walls
b)
A rich blood supply.
c)
Blood flows through them in opposite direction to water flowing over them.
d)
Finger-like projections called villi.
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