Qualification > Sciences
Edexcel BIOLOGY Doubts!!!!
AbdulKareem:
--- Quote from: Hissa on January 21, 2011, 10:21:35 am ---I have some few questions from unit 4 (A-level):
- Suggest two enviromental conditions that could increase the rate of oxygen production in plants
- Describe how a forest could be managed sustainably in order to ensure a continual supply of timber for the future
-Name a method by which global sea temperatures can be monitored
-Some recovery in the great barrier reef may be taking place at present. Suggest a possible explanation for this, other than change in sea temperature
-HIV positive people were excluded from the data (ie data about number of new TB cases). If they have been included suggest how the data would differ. Give an explanation to your answer.
-Give one example of physical evidence that could be retained from the original investigation of a crime scene and explain why the sample is suitable for a DNA test to be carried out.
SOrry for being thick, answer what u can if u please :) thanks alot ;D
--- End quote ---
Here's what I think are some correct answers;
-Any condition which will increase the rate of photosynthesis over respiration so the plant produces more oxygen (e.g. 1.higher temperature 2.brighter sunlight/light... etc.)
-By planting seeds after cutting trees.
-Maybe reducing CO2 emissions? Hmm it's unlikely.. I'm not sure to be honest.
-The increasing acidity of the sea (lower pH because of more CO2 absorption by the sea).
-The number of people affected with TB would have been higher. Explanation: TB is an opportunistic disease which only attacks when your immunity is at its weakest. HIV kills the T-helper cells in your immune system which makes it very weak, and so TB finds the perfect time to attack.
-Blood/Falling hair... etc.
Refer to DNA profiling. I'm sorry but I'm a bit short on time right now.
I hope it helps :D
Good luck mate!
Amelia:
--- Quote from: AbdulKareem on January 21, 2011, 04:14:37 pm ----Maybe reducing CO2 emissions? Hmm it's unlikely.. I'm not sure to be honest.
--- End quote ---
How about sencors?
--- Quote from: Hissa on January 21, 2011, 10:21:35 am ----Give one example of physical evidence that could be retained from the original investigation of a crime scene and explain why the sample is suitable for a DNA test to be carried out.
--- End quote ---
check these - http://en.wikipedia.org/wiki/DNA_profiling
http://www.answers.com/topic/genetic-fingerprinting
Amelia:
--- Quote from: abuelzouz on January 21, 2011, 03:40:52 pm ---hey wt about the quadrat/transect experiment? i knw nothin how 2 do it!
--- End quote ---
Something like this, you mean?
abuelzouz:
--- Quote from: Amelia on January 22, 2011, 05:36:23 pm ---Something like this, you mean?
--- End quote ---
Thanks a lot still ddnt check it have 2 open my laptop 2.. my pc has office 2003 nt 2007 Thanks again :D
AbdulKareem:
--- Quote from: Amelia on January 22, 2011, 04:41:22 pm ---How about sencors?
check these - http://en.wikipedia.org/wiki/DNA_profiling
http://www.answers.com/topic/genetic-fingerprinting
--- End quote ---
The links have too much general not required information.. They won't help.
Perhaps reading what you post before you post it is a good idea ;D
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