AQA BIOL4 ~ 11th June 2013 ~ A2 Biology Watch
I think so, because even if you have made a correct point in your answer, the teacher/person marking your paper might not be a biology teacher so they won't understand it, so they just go by the mark scheme
With primary succession, pionear species are able to create a less hostile environment(cba to explain you know why probs), which takes along time to create a climax community. For secondary succession, the process is much quicker as the soil tends to be rich in nutrients as a result of primary succession and some small organisms are still present. Consequently a climax community is reached much quicker
Then, when the organisms die, humus is formed creating soil and allowing other more complicated organisms to take over due to the environment being less hostile.
Then, the newer species will outcompete the old species.
I think the 5th mark may come from the things which they are outcompeting them with. i.e. light and nutrients.
Ok how much reduced NAD is made in the krebs cycle per acetylcoenzyme A and how much reduced NAD is made overall in respiration, I think answers are 3 and 10 but not sure?
2 " "-6 REDUCED NAD
2 REDUCED NAD IN LINK REACTION
2 REDUCED NAD IN GLYCOLYSIS
SO 10 overall.
Oh yeah do things "predate" on other things, does that make sense? Or can you only say, X "preys" on Y?
and don't overstretch yourselves on the last day!
EDIT: I got negged Ah well...
Take water into the exam with you.
DO NOT go into that exam hungry. Even if it is a slice of plain toast or a banana.
Do not stress, stress and you will forget!
Dont they? Sorry about that. I dont know why, if you give me your email address I can email them to you instead I dont know if you can post pdf's here?
Sorry for the lateness, ive done all past papers except for january 2013