Transport Systems Flashcards
1
Q
Suggest why blood flow in a leg vein is slow when there is a lack of movement? [2 marks]
A
Less muscle contractions to push blood
2
Q
Suggest why a clot that blocked the small blood vessels in the lungs can cause death? [2mks]
A
No oxygen transported to the rest of the body to carry out respiration
3
Q
Describe how to set up an apparatus to estimate rate of water loss from leafy shoot? [4mks]
A
1cut under water
2 water tight / air tight / seal
3 how bubble introduced
4 dry leaves
5 measure distance bubble moves / length of bubble
6 scale / ruler / cm
7 time / second / minute / hour / day
8 repeat
4
Q
Explain change in water loss when wind is increased?[2mks]
A
More water loss because water is blowed out leaf and maintains diffusion gradient
