** LC BIOLOGY 2014 - Before and after discussion **

allyb17

Do we have to do ecology? Would there be a choice?

Badwulf

allyb17 wrote: »

Do we have to do ecology? Would there be a choice?

You don't have to, but in fairness, its all just common sense really

Poliana.xo

allyb17 wrote: »

Do we have to do ecology? Would there be a choice?

There are 6 long questions you do 4, so yeah there's choice. But ecology is handy to know, it's always in the short and long questions.

Caoimhz

EoghanIRL wrote: »

Hey:) either is fine .
Iodoform test : pale yellow crystals are formed confirming presence of alcohol .

Thanks so much! I'm so nervous for it! ðŸ˜

bb1234567

Yellow Idoform crystals

So what are ye predicting for the long questions?? Lymphatic system is probably gonna pop up I'd say!

Shane15

ShaneDunleavy wrote: »

So what are ye predicting for the long questions?? Lymphatic system is probably gonna pop up I'd say!

What do we need to know for this, does anyone know?

Jackson07

I think male reproduction will be on it for some reason,

For the Lymphatic System, you'd probably get away with just learning it's structure and it's functions!

Any of ye think the breathing system will come up?? Or a big dirty ecology question in the long questions??

allyb17

Shane15 wrote: »

What do we need to know for this, does anyone know?

Basically the lymphatic system consists of the thoracic duct and the right lymphatic duct. Know the functions:
1. It collects and returns tissue fluid to the blood, the blood in arteries runs at great pressure so it forced out kind of fluids and proteins and fats, now most of these are re absorbed by venules but some is collected by the lymphatic ducts.
2. It fights infection in 3 ways. By filtering out micro organisms that may cause harm , by storing and maturing lymphocytes, and with antibody production
3. It transports and absorbs digested fats.

That's basically it really it's a very small chapter


Also it returns through the ducts, the tissue fluid to the subclavian vein !

watsupboys

Hi how would u the best describe how you carried investigation out on the IAA (eg 2010 q9)

Mario95

I revised over 100 pages of my biology book and I did a LOT of exam questions since my Maths today. I think I am slowly going crazy form the amount of study.

If you are in 5th year and you are reading this, my advice is: DO NOT leave biology until the last day of your exam. Especially if you want to get a low A/high B. Maths and English is manageable for the last day but biology absolutely isn't.

Anyone predict the nephron coming up??

allyb17

watsupboys wrote: »

Hi how would u the best describe how you carried investigation out on the IAA (eg 2010 q9)

Talk about the serial dilution for sure
The you mark each Petri dish I think it's 8, so one will have the full stock solution and each is a tenth of the concentration of the previous. Ensure the acetate grid is on and fill with cotton wool etc and pour rest of the assigned IAA solution onto the cotton wool to absorb it. Ensure that they're marked appropriately. Incubate etc.. I think it's more IAA means more shoot growth and less root growth and less IAA means more root growth and less shoot growth. Forgive me if I'm wrong this is all at the top of my head!

This is terrible :L

Shane15

allyb17 wrote: »

Basically the lymphatic system consists of the thoracic duct and the right lymphatic duct. Know the functions:
1. It collects and returns tissue fluid to the blood, the blood in arteries runs at great pressure so it forced out kind of fluids and proteins and fats, now most of these are re absorbed by venules but some is collected by the lymphatic ducts.
2. It fights infection in 3 ways. By filtering out micro organisms that may cause harm , by storing and maturing lymphocytes, and with antibody production
3. It transports and absorbs digested fats.

That's basically it really it's a very small chapter


Also it returns through the ducts, the tissue fluid to the subclavian vein !

Thanks so much.

Could somebody please break down Respiration for me?

Fiske

Would I be grand basing my revision on the syllabus learning outcomes thingy, as opposed to just going through everything in the book? What they say you need to know from a chapter is sometimes a lot less than everything the book emphasises.

Only got home a while ago, I hate living so far away from school. Time to break out the Red Bull, lol.

watsupboys

Quote:
Talk about the serial dilution for sure
The you mark each Petri dish I think it's 8, so one will have the full stock solution and each is a tenth of the concentration of the previous. Ensure the acetate grid is on and fill with cotton wool etc and pour rest of the assigned IAA solution onto the cotton wool to absorb it. Ensure that they're marked appropriately. Incubate etc.. I think it's more IAA means more shoot growth and less root growth and less IAA means more root growth and less shoot growth. Forgive me if I'm wrong this is all at the top of my head!


Hi thanks for this but i mean could anyone acc write what thy would write in. There is a lot of it nd i find i difficult to put everything in words in such amount of space. I also want to cut as much as possible to be able to still get full marks thanks a lot again

Shane15

Does at least one of photosynthesis, ecology or genetics usually get a long question to themselves? I know them well, especially genetics since I'm actually interested in it.

If anyone has any long question predictions will you tell me please before my head explodes xxxxxxxxxx

Fiske

Think my teacher said that there's always 1 Long Q from Unit 1, 2 Long Qs from Unit 2 and 3 Long Qs from Unit 3. But for Unit 1 the options are basically limited to Food and Ecology, since there's not enough in the others to really get a long question out of it. I think Food was the Long Q one year so far, every other year it has been Ecology. So you can defo be pretty sure on a long Ecology question, and I'm pretty sure Genetics comes up as one most of the time as well.

Photosynthesis wouldn't be guaranteed as a long but I imagine it'd pop up somewhere.

Shane15

Fiske wrote: »

Think my teacher said that there's always 1 Long Q from Unit 1, 2 Long Qs from Unit 2 and 3 Long Qs from Unit 3. But for Unit 1 the options are basically limited to Food and Ecology, since there's not enough in the others to really get a long question out of it. I think Food was the Long Q one year so far, every other year it has been Ecology. So you can defo be pretty sure on a long Ecology question, and I'm pretty sure Genetics comes up as one most of the time as well.

Photosynthesis wouldn't be guaranteed as a long but I imagine it'd pop up somewhere.

I don't use the book so I have no idea what's in each unit, but thanks! Gives me hope. :P

b3rnade11e

Is anyone expecting the carbon cycle or the nitrogen cycle to pop up?

Fiske

Shane15 wrote: »

I don't use the book so I have no idea what's in each unit, but thanks! Gives me hope. :P

The way it's organised in my book is:

Unit 1 (1 Long Question)

scientific method
characteristics of life
food
ecology
higher level ecology
study of an ecosystem

^ So as you can see....pretty likely Ecology Q here. Food gets asked in short questions a lot, but Scientific Method and stuff never seems to make an appearance other than maybe asking what a hypothesis is and stuff like that.


Unit 2 (Two Long Questions)

cell structure
cell diversity
enzymes
HL enzymes, energy carriers
photosynthesis
respiration
diffusion + osmosis
cell division
classification and hereditry
DNA and RNA
genetic crosses
variation and evolution
genetic engineering

^ Once again, this one is pretty small in scope. Just knowing Genetics and everything to do with the cell will do you a world of good.

Unit 3 (3 Long Questions)

classification of organisms
monera
fungi
protista (amoeba)
flowering plant structure
transport, food storage, gas exchange in flowering plants
blood
heart + blood vessels
lymphatic system
human nutrition
homeostasis
human breathing
excretion
plant responses
the nervous system
the senses
endocrine system
skeleton and muscles
human defence system
viruses
sexual reproduction in flowering plants
vegatative propagation
human reproduction

^ Widest range of topics is in Unit 3 by far! But just by knowing Unit 1 and Unit 2, you have 3/4 of your long questions, and they are much narrower in scope and therefore easier to revise for. Above all make sure you know Units 1 and 2 really well, they cover most of the exam on their own. Then go ahead and learn all of this if you feel like xD

ib2014

Nah, came up last year didn't it?

Jackson07

I don't think it'll be adivsable to study nitrogen cycle since it was on last years paper it's too long and takes up to much time!

This is what I'm predicting..

Short Q's:
1. Food
2. Nitrogen Cycle
3. Cell Division
4. Human Embryo Development
5. Genetic Engineering
6. Digestion

Experiments:
7. Heart Dissection
8. IAA
9. DNA extraction/TS of Dicot stem

Long Questions:
10. Genetics
11. Ecology
12. Circulatory System + Breathing System
13. Seed Dispersal + Variation/Evolution + The Eye
14. Respiration + Photosynthesis

.. What do ye think??

TaiHusky

ShaneDunleavy wrote: »

This is what I'm predicting..

Short Q's:
1. Food
2. Nitrogen Cycle
3. Cell Division
4. Human Embryo Development
5. Genetic Engineering
6. Digestion

Experiments:
7. Heart Dissection
8. IAA
9. DNA extraction/TS of Dicot stem

Long Questions:
10. Genetics
11. Ecology
12. Circulatory System + Breathing System
13. Seed Dispersal + Variation/Evolution + The Eye
14. Respiration + Photosynthesis

.. What do ye think??

I think its fairly well predicted. For now Im focusing on the experiments since its 30%

Poliana.xo

ShaneDunleavy wrote: »

Could somebody please break down Respiration for me?

First stage is Glycolysis
Glycolysis takes place in the cytosol of the cell, does not require oxygen.
6carbon molecule is split into 2 pyruvic acid (3carbon molecule).
Small amounts of energy are released (ATP)

Stage two requires oxygen
If oxygen is present, pyruvic acid will enter mitochondrion.
Pyruvic acid will be split into CO2 and Acetyl Co-Enzyme A. Two high energy electrons are lost from pyruvic acid, which join with NAD and a proton to form NADH.

Krebs Cycle
Krebs cycle takes place in the lumen of mitochondrion.
Acetyl CoA will enter the Krebs cycle. It is broken down into CO2 and protons.
Protons released are picked up by the electron carrier NAD to form NADH. There is also ATP formed.

Electron transport chain
Located on the inner membranes of mitochondrion.
High energy electrons are passed on from NADH from one molecule to another. They lose energy and form ATP. At the end of each electron transport system, the low energy electrons (lost all the energy) are removed, as they combine with Hydrogen and Oxygen to form water.