May 2013
5 posts
Anonymous asked: HEEEEEEEYYYYYYYYY, i am having my biology exam (cie paper 6) today!!! IN 4.5 hours! YEY! I I have read the whole revision guide twice and i've done approximately 15 past papers of paper 6. What do you suggest i do now....
Anonymous asked: things that would most likely come up in paper 6? and, are your notes in order? cos im taking down some and don't know how to order them up in diff chapters!
Anonymous asked: Paper 6 biology- boards tomorrow. I need a confidence boost. Im blanking out! what should I do?
Anonymous asked: I've got my igcse cie paper 6 tomorrow.. help?:(
Anonymous asked: Hello i'm Christie and I'm having my cambridge IGCSE Biology Paper 6 exam tmr afternoon and I havnen't start revising!!! (Stupid, I know). What should I do? I don't know what I'm supposed to knor for Paper 6 and how do i revise it in less than 24 hours?!
March 2013
2 posts
Anonymous asked: What would be your advice to revise for paper 6 in bio? --Amrit. thank you.
Anonymous asked: I have my prefinal exams in a week and a half and I'm.. Uml... Scared to death!! Any help?
November 2012
1 post
Anonymous asked: Wow.. Cool! :) didn't know this existed... I have bio 2mrw and m sooooo NERVOUS! :/
July 2012
2 posts
Anonymous asked: I'm happy your done with them coz my exams r this upcoming november & im a homeschooled girl so its quit hard for me :( do you have advice for me which might help me in my exam ?!
Anonymous asked: How Good Was Your Exams ?!
May 2012
224 posts
redrumkiss asked: haha same! i found the first question hard :P about the vena cava and aorta and capillaries :P
redrumkiss asked: hey how did you find the paper?
flatulence-and-frustrations-dea asked: omfg. i only just found out about this blog today, which is jfdkajf amazing btw. and i just had my biology exam a couple of hours ago. which may i add, was fucking insanely difficult. anyways do you have one like this for chemistry? I saw someone asked a while ago, but the link didn't work :\
Anonymous asked: may I ask what do I ned to know for biology paper 6 CIE? anything specific? thank you <3
shadesofyouu asked: My biology exam is tmr morning :) idk if urs is on the same day but we're doing edexcellll, so I'm js here to wish u good luck and alllll the besttttt !!!! A* for all three sciences YAY!! :D
iesoph asked: This blog is the answer to all my problems. Revising Bio on tumblr! Genius! Thank you :)
kamikaze95 asked: is there one for physics? and is this australia???????? aha
Anonymous asked: good luck with all of them!!!
Anonymous asked: what exams do you have this week?
will-always-be-there asked: Heey is this igcse biology alone or igcse combined science the biology part? thankss:)
Anonymous asked: that link doesn't work! and no i do edexcel thanks xx
Anonymous asked: THANKYOUSOMUCH. is there a chemistry igcse edexcel blog? can you please make a post on ultrafiltration and reabsorption i know you've touched on them in previous posts but could you go into more depth please? could you also make one for the production of beer? thankss xxx
Anonymous asked: Do you have any notes for edexcel physics? Help :(
Anonymous asked: I love your tumblr ! Your blog is very useful and my exam is next week !!! what exam board are u taking btw ><???
itsabercrombiebitch-deactivated asked: You have nooooo idea how useful your notes are to me! Good luck with your exam btw :)
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Skin Change
Hairs help the body to retain heat because when hairs stand up, air is trapped between them and insulates the body. It also prevents energy from being lost.
Vasodilation: blood vessels widen to allow more blood to flow, allowing heat loss
Vasoconstriction: blood vessels constrict to allow less blood to flow, allowing less heat loss
Sweating cools the body because sweat evaporates and it cools...
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Skin Change
When you are too hot:
The erector muscle of hairs will relax
Sweat glands release sweat
Capillaries near surface of skin will get bigger
Rate of respiration will decrease
When you are too cold:
The erector muscle of hairs will stand up
Sweat glands don’t release sweat
Capillaries near surface of skin will get smaller
Rate of respiration will increase
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Skin
The skin is the main organ involved in the control of body temperature. The skin is an organ because it’s made up of 3 layers of tissue; dermis, epidermis and hypodermis
The skin can detect changes in temperature by hypothalamus which is sent from receptors.
In the brain is a special region called the hypothalamus. This area monitors blood temperature and information sent from receptors...
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Eye Light Intensity
In dim light: the size of the pupil is medium
In torch light: the pupil is small
Just after torch light: the pupil is medium
Blindfold removed: the pupil is big
The response in the eyes is a reflex because it responds on its own. Automatic response.
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Eye
Changes that take place in the eye that allow you to see objects at different distances are called accommodation. Accommodation is a special process that involves focussing light to achieve a sharp image.
About 70% of light rays are refracted as they pass through the cornea. The lens however, makes the final adjustment by changing its shape so that light coming from far or near objects can be...
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Seed Germination
Seeds produced after fertilisation of an ovule in the ovary of a flower. Once the seed is formed it can lay dormant for a long time. It reads the conditions of warm temperatures, water and oxygen.
Warm temperatures: for enzymes to breakdown starch into glucose and to help with respiration
Water: causes the seed to swell, to make starch soluble so enzymes can break it
Oxygen: for respiration
...
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Cloned Transgenic Animals
1. Human antibody production
mice are used for this
antibodies need to be made at a large scale so they can be used to treat cancer
2. Animal organs for human transplantation
xenotransplantation= the process of transplanting organs or tissues between different species
unlimited supply of cells, tissues, organs
it maybe rejected by the human body
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Oil Palms
Cloning would mean farmers will have the best palm trees that give the highest yield, allowing maximum profit.
If there was an infectious disease that affects that one variety, then the whole entire species of palm trees would be wiped out.
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Cloning Animals
Fusion cell cloning:
replacing the nucleus of an unfertilised egg with the nucleus from a different cell
replacement nucleus can come from an embryo but if it comes from an adult, it’s called adult cell cloning
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Genetically Modified Plants
Some plants are given genes that provide resistance to pests. BT corn is an example.
The BT gene is cut out of the enzyme and is inserted into the genes of the corn and the placed into a vector and is multiplied in bacteria. It’s then inserted into the corn cell genome and then GM corn is made.
3 other examples of GM plants:
cereals to allow nitrogen fixing nodules. Able to receive...
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Restriction Enzymes
special types of enzymes can cut DNA in specific places
can allow other fragments of DNA to be inserted
enzymes are called restriction enzymes. It cuts the DNA in a certain place and allows another piece of DNA to be inserted
ligase connects the DNA back together
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Fish Farming
Advantages:
water quality can be monitored
diet of fish can be monitored
protected against predators
pesticides are used to kill parasites
improve quality of fish
Disadvantages:
potential for spread of disease is greater because animals are close together
antibiotics used to treat fish may not have been degraded by the time the fish are eaten by humans
cause eutrophication from food...
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Selective Breeding
Artificial selection: when humans select the best and let them breed, so the offspring are the best.
4 characteristics animals would be selectively bred for:
meat quality and quantity
milk
industrial uses
appearance
4 characteristics plants would be selectively bred for:
quality of fruit
specific appearance
longevity
weather resistant
disease resistant
more efficient
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Production of Yoghurt
Relies on bacterial fermentation
effect of specialised bacteria allows to convert lactose in milk into lactic acid
Reacts with the protein in the milk and turns them into a semi solid substance with a sour taste.
Pasteurise the milk: thicken with skimmed milk powder at around 40 degrees celsius
Heat the milk to 40 degree celsius
Add bacteria: converts milk sugar into lactic acid
Cool the...
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