Physics, Chemistry and Biology: Post your doubts here!

[Ahmed Khider]

the diagram is only about the circulatory system guys nothing connecting with any other organes

Ya the cirulatory system is an organ system..thats what ive been trying to say

 

[Rahma Abdelrahman]

No they are not organs..they are tissues but in this diagram they are connecting different organs who are part of the same organ system.

I asked my teacher and she said they are ORGANS.

 

[Ahmed Khider]

I asked my teacher and she said they are ORGANS.

Thats weird!! Its the 1st time i know that vessels are organs!!

 

[Just Smie :)]

Thats weird!! Its the 1st time i know that vessels are organs!!

i think they r more like tissues not organs

 

[Ahmed Khider]

i think they r more like tissues not organs

Ya thats what i think!!!

 

[Ahmed Khider]

I asked my teacher and she said they are ORGANS.

I dont think your teacher is right..check out this link http://answers.yahoo.com/question/index?qid=20080703182004AA2NPRi

 

[AAnsarii]

i have a doubt in bio may 2011 Q 11
how come it is D i thoght it is B because the pollen tube is coming from the anther and
Q 19 i know anopheles is a ninsect because it has wings but which is the other insect

it's comin 4m d anther of d same flower, n it doesn't happen internally, d pollen must fall on d stigma, which is d case in D.

1. Characteristics of insects:
2. 1. 3 body parts
   2. one pair of antennae
   3. compound eyes
   4. mandibles
   5. thorax
3. 6.exoskeleton
4. 7.open circulatory system
5. so dis doesnt mean dat d thing NEEDs 2 have wings 2 b an insect, c 4 instance ants., so d 1st organism is also an insect

​

 

[AAnsarii]

w06, q 40--how do u noe dat it's not C6H12?

 

[Rahma Abdelrahman]

I dont think your teacher is right..check out this link http://answers.yahoo.com/question/index?qid=20080703182004AA2NPRi

Well, do you have the mark scheme for June 2000?
If yes, check Q 5: At which level of organisation is an artery?
A. a cell
B. an organ
C. an organ system
D. a tissue
I have it as a hardcopy only! and it says B.
I did this mistake before and wouldn't repeat my mistake, earlier I thought it is a tissue but the teacher corrected me last year!

 

[Rahma Abdelrahman]

I dont think your teacher is right..check out this link http://answers.yahoo.com/question/index?qid=20080703182004AA2NPRi

http://www.bcb.uwc.ac.za/SCI_ED/grade10/manphys/vessel.htm
Check out this link!
We said before that an organ consists of a group of tissues, right? If you go through this link, you will read the following: "The outer layer consist of white fibrous connective tissue which merges to the outside with the loose connective tissue in which artery is found. This helps to anchor the arteries because the heart pumps the blood through the arteries at a great pressure. The thick middle layer consist of elastic connective tissue and involuntary muscle tissue. "
So, we have fibrous tissue, connective tissue, elastic connective tissue and involuntary muscle tissue.
Aren't you still convinced?
Good luck in Tuesday's exam !
We have to DISCUSS to find out WHAT is right, not Argue to find out WHO is right ! because when the examiners are checking our papers, they will give marks for the correct answer only and no one would like to lose a mark for such a thing, right?
AND, MY TEACHER IS ALWAYS RIGHT!

 

[IGSCE.Geek.]

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_s07_qp_1.pdf
HELP QUESTION 6!!! HOW COME ITS B BUT NOT A!?

 

[Rahma Abdelrahman]

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_s07_qp_1.pdf
HELP QUESTION 6!!! HOW COME ITS B BUT NOT A!?

It is not necessary that they are in the same period, for example if Y is in group 4,5,6,7 or 8, then Z is in period 3 not 2.
The Q says,"MUST" be correct, which is B, same no. of electrons in first shell !
Understood?

 

[Maz]

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_s07_qp_1.pdf
HELP QUESTION 6!!! HOW COME ITS B BUT NOT A!?

The other options may be correct, but not necessarily. That's why the question highlights the term 'must'. So, although both of them may be in the same period, but they must have the same number of electrons in their first shell.

 

[IGSCE.Geek.]

The other options may be correct, but not necessarily. That's why the question highlights the term 'must'. So, although both of them may be in the same period, but they must have the same number of electrons in their first shell.

curse the EXAMINERS!!!

 

[IGSCE.Geek.]

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_s07_qp_1.pdf
QUESTION 16 WHY IS IT C BUT NOT B???????
IM GOING TO DO TERRIBLY IN THE EXAM!!!!!!!!!!!!!!!!!

 

[IGSCE.Geek.]

ALSO QUESTION 22 WHY IS IT C BUT NOT D?

 

[IGSCE.Geek.]

 

[IGSCE.Geek.]

anyone else feels like they're going to do terribly in their last IG's? i actually prefer bio million times more than chemistry!

 

[IGCSE O/L student]

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_s07_qp_1.pdf
QUESTION 16 WHY IS IT C BUT NOT B???????
IM GOING TO DO TERRIBLY IN THE EXAM!!!!!!!!!!!!!!!!!

ALSO QUESTION 22 WHY IS IT C BUT NOT D?

Q 16. in the thrid equation, there isn't a reactant that oxidises or reduces, so it isn't a redox reaction.
Q 22 there is no reactant that is being reduced, but a precipitate is formed when the reaction is complete, so the reaction is precipitation

 

[Ahmed Khider]

Well, do you have the mark scheme for June 2000?
If yes, check Q 5: At which level of organisation is an artery?
A. a cell
B. an organ
C. an organ system
D. a tissue
I have it as a hardcopy only! and it says B.
I did this mistake before and wouldn't repeat my mistake, earlier I thought it is a tissue but the teacher corrected me last year!

Thats like the weirdest thing ive ever heard!!U knw wat let me ask my teacher and see what he has to say!!