As Ocr Biology Exam Question? Watch

lilpg
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#1
Report Thread starter 9 years ago
#1
i was wondering if anyone knows where i can find the mark scheme for this
question ...

Describe and explain the roles of water in living organisms and as an environment for living organisms. (10)

its an essay question ...
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Spacecam
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What year and module is it - I've got a CD full of the Mark Schemes
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lilpg
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lol well i don't know the year ..
because we were just given a sheet in class and told to answer it.
the full question is:

1. In this question, one mark is available for the quality of written communication.
Some of the properties of water are listed below.
• boils at 100 °C
• freezes at 0 °C
• water below 4 °C is less dense than water above 4 °C
• excellent solvent
• much energy is required to raise the temperature of water
• much energy is required to change water into water vapour
• high surface tension and cohesion
Describe and explain the roles of water in living organisms and as an environment for living organisms.
You will gain credit for using information about the properties of water.

but the module is::
Cells, Biological Molecules, Biodiversity & Evolution
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sas_rams
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If its off a proper past paper you can usually just type the question into google and it will give the paper its come off and the mark scheme
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COMMUNIST
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4
(b)
marking points 1, 4, 8, 14, 19, 20 and 22 relate to the bullet points in the question

1. liquid at normal temperatures ;
2. hydrogen bonding between water molecules ;
3. molecules more difficult to separate ;
4. ice floats on water / water freezes from top down ;
5. insulates water beneath ;
6. large bodies of water don’t freeze completely / animals can still swim etc ;
7. (change in density with temperature) causes currents to circulate nutrients ;
8. solvent for , polar / ionic , substances ;
9. solubility of gases in environment ;
10. allows reactions to take place ;
11. transport medium ;
12. e.g. (of substance carried in what) ;
13. transport medium for , gametes / blood cells ;
14. water slow to change temperature ;
15. lakes / oceans / large volumes , provide thermally stable environment ;
16. internal body temperature changes minimised ;
17. used for cooling ;
18. e.g. (sweating / panting / transpiration) ;
19. large amount of energy must be removed for water to freeze ;
20. organisms can use surface of water (as habitat) ;
21. e.g. ; (of organism)
22. can form (long / unbroken) columns of water ;
23. ref. to vascular tissue / xylem ;
24. reactant (photosynthesis) ;
25. role in , hydrolysis / condensation ;
26. AVP ; e.g. transparency
27. AVP ; plants can photosynthesise under water
incompressible
hydrostatic skeleton / turgor
buoyancy
guard cell mechanism
support for large organisms on ice (penguins / polar bears)
further detail of any point
9 max
QWC – legible text with accurate spelling, punctuation and grammar; [1]
[Total :12]
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shay25
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(Original post by COMMUNIST)
4
(b)
marking points 1, 4, 8, 14, 19, 20 and 22 relate to the bullet points in the question

1. liquid at normal temperatures ;
2. hydrogen bonding between water molecules ;
3. molecules more difficult to separate ;
4. ice floats on water / water freezes from top down ;
5. insulates water beneath ;
6. large bodies of water don’t freeze completely / animals can still swim etc ;
7. (change in density with temperature) causes currents to circulate nutrients ;
8. solvent for , polar / ionic , substances ;
9. solubility of gases in environment ;
10. allows reactions to take place ;
11. transport medium ;
12. e.g. (of substance carried in what) ;
13. transport medium for , gametes / blood cells ;
14. water slow to change temperature ;
15. lakes / oceans / large volumes , provide thermally stable environment ;
16. internal body temperature changes minimised ;
17. used for cooling ;
18. e.g. (sweating / panting / transpiration) ;
19. large amount of energy must be removed for water to freeze ;
20. organisms can use surface of water (as habitat) ;
21. e.g. ; (of organism)
22. can form (long / unbroken) columns of water ;
23. ref. to vascular tissue / xylem ;
24. reactant (photosynthesis) ;
25. role in , hydrolysis / condensation ;
26. AVP ; e.g. transparency
27. AVP ; plants can photosynthesise under water
incompressible
hydrostatic skeleton / turgor
buoyancy
guard cell mechanism
support for large organisms on ice (penguins / polar bears)
further detail of any point
9 max
QWC – legible text with accurate spelling, punctuation and grammar; [1]
[Total :12]
What marking points goes to which bullet point? or does it not matter?
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