Water

Question 1

Properties of water

Answer 1

Polar-bio solvent-chem reactions occur

H bonds - take a lot of energy to overcome High specific heat capacity

Latent heat of vaporisation -cooling effect

Cohesion and surface tension - habitat

Transparent-photosynthesis under water

Ice floats-habitats

Question 2

Uses

Answer 2

Metabolism -condensation and hydrolysis
Solvent -polar-dissolves ions
Cooling-high latent heat
Transparent-plants photosynthesis
Support-turgid cells

Question 3

Hypertonic

Answer 3

Shrivelled
Low WP
High solute conc

Question 4

Isotonic

Answer 4

Normal flaccid
No net osmosis

Question 5

Hypertonic

Answer 5

Swell and burst
Low solute conc
High wp

Question 6

What happens to cells in pure water

Answer 6

•
What happens in pure water?
Animal cell will eventually burst – CYTOLYSIS (red blood cells are haemolysed – can you think where this name comes from?)
• Plantcells-swelling cytoplasm & vacuole will push against the cell wall which will stop the cell getting any larger- TURGID

Question 7

What happens to cells in conc sugar solution

Answer 7

•
Animal cell: cell contents shrink & membrane wrinkles – this creates bumps/wrinkles – called CRENATION (cells are crenated)
Plant cell - cytoplasm & vacuole shrink (the cell becomes FLACID) and plasma membrane pulls away from cell wall- PLASMOLYSI