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Biology B AS LEVEL new 2015 spec 7th JUNE

ALEVELGEEK031098

How did everyones go and what answers did you get

(edited 7 years ago)

Reply 1

ALEVELGEEK031098

For the active transport q1:

- Diffusion against the concentration gradient
- using ATP for energy

Reply 2

ALEVELGEEK031098

For classification the domain was Eukaryota and the missing taxonomy was class

Reply 3

ALEVELGEEK031098

For the cohesion tension theory and how it supports the graph (6)

Water is "pulled" up the xylem by the water lost through transpiration. The column of water doesn't break because of the cohesive forces between the water molecules. Hydrogen bonds between indiviual water molecules is the force of attraction. The pulling action of transpiration stretches the water column in the xylem so that it is under tension. This decreases the width of the xylem hence shown in the graph as an increase in transpiration decreases width of xylem vessel. The graph shows positive correlation.