AQA BIOL2~3rd June 2013~AS Biology (Now Closed) Watch
If you remove leaves - I understand that fewer stomata and smaller surface area reduce transpiration rate - but how is there a less cohesion/tension force?
Evaporation forms a suction which pulls more water into the leaf (cohesion). Water molecules are cohesive (they stick together) so when some are pulled into the leaf others follow. This means the whole column of water in the xylem from the leaves down to the roots moves upwards. Water then enters the stem via roots.
Can somebody please just go over what we need to know about cancer for the exam? D:
Treatments for cancer have to be staggered to give the body a chance to recover and replace body cells. If too much chemotherapy is undergone the patient will die as a result of such body cell damage.
Is this a PM or morning exam for you lot?
Partial pressure is basically the concentration of a gas in a mixture. Whenever we talk about haemoglobin, partial pressure is used because the affinity of haemoglobin is not affected by concentration of oxygen alone. It is also affected by other gases in air such as carbon dioxide, so partial pressure allows us to see the relative concentrations of the gases in air.
You know when you're asked about the loading transport and unloading of oxygen do you write about the pH of CO2 or the p.O2 of oxygen??