Biology; Chemistry; Physics: Post your doubts here!

[Parhaakoo]

plz solve the (c) for me.........it's pretty simple bt my answer is not corrct acoording to dis book :/
nd second question: can i rely on the redspot past papers.......i mean are the answers and solutions perfectly correct or flawed???
plzz sm1 do help......nd i apologize if i post this as a reply to sm1's qs(if it's not supose to go that way) or anything like dat cause i don't really get this....

View attachment 59528

Well you're supposed to find the area under the graph and thats how u find the area of trapezium. (1/2(height)(sum of parallel sides))

 

[tdk]

Can anybody give me the November 2015 QP and MS for Physics, Chemistry, Bio, Maths D and Additional Maths? Thank you in advance.

 

[My Name]

Can anybody give me the November 2015 QP and MS for Physics, Chemistry, Bio, Maths D and Additional Maths? Thank you in advance.

OL check here
http://www.gceguide.com/past-papers/o-levels/

 

[fahadhameed32]

offcourse you can rely on the ans of the topical . but firstly try to do it your self . then see the answers .

 

[fahadhameed32]

dude you gotta be kidding me that is for A level . first try to do o level then go to that A level .

 

[Miral Lovato]

Can any body provide me notes or a link to any resourceful site for radioactivity In physics?
I'd be very thankful

http://www.gcsescience.com/prad-physics-radioactivity-links.htm

 

[darkvoid]

Hey does anyone have notes on micro-organisms , drugs and locomotion (Biology O level)?

 

[smiling star]

Can anyone solve this qs part e and f for me pls
I'd be grateful
It's chem ATP November 2012 variant 1 qs9

 

[smiling star]

Hey does anyone have notes on micro-organisms , drugs and locomotion (Biology O level)?

Hey does anyone have notes on micro-organisms , drugs and locomotion (Biology O level)?

Why don't you check out the book lam peng for this?

 

[smiling star]

Btw I need tips on ATP papers cause idk if I should focus more on practising p2 or p4 now
Also, I'm still not done with my syllabus so completing that too

 

[Error Syntax]

This is for the E part

 

[Error Syntax]

Can anyone solve this qs part e and f for me pls
I'd be grateful
It's chem ATP November 2012 variant 1 qs9View attachment 59677View attachment 59678

This is for the F part

 

[Error Syntax]

Btw I need tips on ATP papers cause idk if I should focus more on practising p2 or p4 now
Also, I'm still not done with my syllabus so completing that too

Do as many papers as you can but first try to cover up the syllabus especially Salts , Identification of Salts , Acids and Alkali , Experimental techniques , Alcohols and esters and Electroloysis, rate of reaction , redox reaction etc There are others but this is from where the majority of the papers comes and DO AS MUCH PAST PAPERS AS POSSIBLE JUST go crazy. There is pattern in this paper and if you have researched a little bit a person can ace it 60/60 if he knows what he is doing so best of luck and if you have any problem then Just holler.

 

[smiling star]

Thankyouu so much this was really helpful, and I appreciate this tips
Also, wbt physics and bio ATPs
I'm freaking out for physics even the p2 esp with the thermal physics and electronics that is cathode ray and blah

 

[saadiee]

Hello friends, I am repeating Biology as I got a B in June'15.
But I don't know why I am finding it very difficult now even though I thought it to be a job of my left hand last year. It's a strange issue.. and I'm very tensed about it as I'm thinking that I might loose my B also and fall to a C or D...
The main topics that I find difficult are as follows
1. Ecology and ecosystem.
2. Diseases
3. Seed germination and dispersal
4. Bones and joints.
5. Artificial/ Natural selection.
6. Nitrogen Cycle
7. Cheeee, bread, yoghurt and alcohol making.
I'll be thankful if someone helps me with these topics by notes or some tips..
Also as I am a private student I'll be grateful if someone can help me with thewe topics online through skyoe or on mobile...
Thanks, regards.
Saadia

 

[smiling star]

Hello friends, I am repeating Biology as I got a B in June'15.
But I don't know why I am finding it very difficult now even though I thought it to be a job of my left hand last year. It's a strange issue.. and I'm very tensed about it as I'm thinking that I might loose my B also and fall to a C or D...
The main topics that I find difficult are as follows
1. Ecology and ecosystem.
2. Diseases
3. Seed germination and dispersal
4. Bones and joints.
5. Artificial/ Natural selection.
6. Nitrogen Cycle
7. Cheeee, bread, yoghurt and alcohol making.
I'll be thankful if someone helps me with these topics by notes or some tips..
Also as I am a private student I'll be grateful if someone can help me with thewe topics online through skyoe or on mobile...
Thanks, regards.
Saadia

Hii there, I know the first topic is dreadful, I find it hell hard too
But I can help you out with the third topic seventh and the fourth one
Do you have some specific queries in these or what can I help you with?

 

[smiling star]

Okay so I'll begin with the third topic, 'SEed Germination and Dispersal'
I hope this helps you out and do remember me in your prayers as I'm giving these subjects too this year, May Allah make ease for us and reward our efforts with the best results, Ameen ^_^


Okay so first of all, what the cie syllabus demands you it know in this regard

- Why is dispersal of seed important or basically what is the purpose behind seed dispersal:

Well, it is simply a means of making sure that the plants are spread away from the main plant so that the likelihood of competition between plants über limited resources such as nutrition in soil is reduced as well as to colonies areas.

-vectors responsible in this regard with named examples

Wind
Either winged fruits like sycamore that have wing like outgrowth
Or parachute fruits or seeds like those of dandelions that have feathery hairs projecting from the,
Or explosive fruits like lupin where the carpel splits ejecting out the seeds

Now what's common in them is that such adaptations allow them to float in wind to large distances and spread away from parent plants.

Animals

Either succulent and juicy fruits like tomatoes eaten by animals and their seeds being resistive to the digestive enzymes passed down in faces

Or hooks or barbs projecting that cling onto animals bodies and fall off as they move about eg burdock


The others aren't in syllabus.

 

[smiling star]

Germination of seeds

-Definition
Development of seed into a new plant when conditions are favorable
Conditions required
Optimum temp for enzyme activity
Oxygen and water for respiration to make energy
-Dormant period

Resting period when they're dry and reduced activities so they can survive the unfavorable conditions
-Stages of germination be it epigeal orhypogeal

Absorption of water causes the seed to swell
Food stored converted to sugars
So seed respires to release energy
Energy used for growth
As a result radicle emerges followed by plumule
On the development of cotyledon photosynthesis starts since they are green and thus the seedling now becomes a self supporting plant

If cotyledons below earth so hypo and if above so epigeal germination

Hope this helps out, remember me in your prayers, Jazak Allah!:')

 

[smiling star]

Can someone explain role of fermenter in biotechnology btw?

 

[smiling star]

Can someone post a link or any worksheet or anywhere I can practise moles from other than chem pastpapers?
Thankyouu