paper 2 predicted

Question 1

explain how the pressure in the capillaries is increased

Answer 1

afferent arterial- wide diameter
efferent arteriole narrow diameter
produces high hydrostatic pressure

Question 2

describe what happens at photosystem 2

Answer 2

-chrolorphyll absorbs light energy
-electrons become excited and lost to electron stansfer chain
-electrons replaced by photolysis which light spilts water into protons and electrons

Question 3

advantage of worm moving away from salt

Answer 3

-salt lowers water potential
so water moves out by osmosis
so moving away prevents worm drying out

Question 4

2 reasons why changes in the allele frequency of white squirrels

Answer 4

• natural selection
  -mutation

Question 5

explain how the measuring allele frequencies of wild populations help conservationists to maintain biodiversity

Answer 5

measure genetic diversity
prevent negative effects