B3 Exchanges

Revise for test on 19th November 2013

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The plant roots could NOT have absorbed these minerals by diffusion. Explain Why
They are absorbed from the soil by active transport because there is a lower concentration outside the root cells, than in them.
1 of 12
A plant root has thousands of root hairs
The root hais help plant roots absorb minerals because of their larger surface area
2 of 12
A root hair cell contains many mitochondria
mitochondria help aerobic respiration to take place and release energy.
3 of 12
What is transpiration?
Water loss as vapor by evapouration
4 of 12
Through which part of a leaf, does most transpiration occur?
The Stomata
5 of 12
Give three features of the alveoli that allow large amounts of oxygen to enter the blood.
1: They have a large surface area 2: Sac walls are thin to reduce diffusion 3: Cell membrane lining is moist to dissolve gases
6 of 12
Name the process by which oxygen passes from the air into the blood
Diffusion
7 of 12
Describe and explain how the villi are adapted to maximize the rate of absorption of the products of digestion.
Many micro-villi give a large surface area, many capillaries give good blood supply and maintain concentration gradient
8 of 12
Describe and explain how the villi are adapted to maximize the rate of absorption of the products of digestion.
The thin walls leave a short distance for the food to travel
9 of 12
Describe and explain how the villi are adapted to maximize the rate of absorption of the products of digestion.
The many mitochondria provide energy for active transport.
10 of 12
Which leaf A, B or C lost most water?
C
11 of 12
Name cell x
Guard Cell
12 of 12

Other cards in this set

Card 2

Front

A plant root has thousands of root hairs

Back

The root hais help plant roots absorb minerals because of their larger surface area

Card 3

Front

A root hair cell contains many mitochondria

Back

Preview of the front of card 3

Card 4

Front

What is transpiration?

Back

Preview of the front of card 4

Card 5

Front

Through which part of a leaf, does most transpiration occur?

Back

Preview of the front of card 5
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