Physics, Chemistry and Biology: Post your doubts here!

[DANISH182]

NEED HELP FRIENDS I AM HAVING CHEMISTRY P3 AND P1 ON 18TH AND PHYSICS P3 AND P1 ON 20TH PLZ GUYS I HAVE NO TIME TO REVISE FOR PHYSICS ITS JUST DAY AFTER TOMORROW AFTER CHEMISTRY SO GUYZ NEED SOME TIPS AND HELP!!!!!!!!!!!!!!!!!!!!1

 

[DANISH182]

I wrote that since the flask will have smaller height its would be easier to judge the end point of reaction,as visibility is effected by distance.
I wrote anhydrous salts in powder form
I actually got 104s

was it hydrated or unhydrated crystals formed?

 

[ThePacifics]

Brain and spinal cord are the CNS so relay neurone are found in both.
Well it would also be appreciated if someone could explain me what this grey matter is now?(Some background details would be appreciated)
And one more question what is neurone transmitter in detail? `~~~~~~~~~~

The grey matter consists of the cell bodies, dendrites, axon terminals (their cell bodies) of neurons.So it is where there are synapses also. The grey matter is in brain and spinal chord.

When a nerve impulse travels along an axon, when it reaches the end of of the fibre it triggers the nerve ending to release a substance called neurotransmitter.
The neurotransmitter are chemicals. These chemicals diffuse through the synapse. As synapse are not a complete connection between 2 nerves they have a gap in between them, so these chemicals (neurotransmitter) diffuse through/across the gap (the synapse) and bind with second nerve. SO these chemicals stimulate the second neuron to transmit the impulse. This is kind of like a chain, so whenever there is a synapse this process is repeated.

 

[christopher g]

Brain and spinal cord are the CNS so relay neurone are found in both.
Well it would also be appreciated if someone could explain me what this grey matter is now?(Some background details would be appreciated)
And one more question what is neurone transmitter in detail? `~~~~~~~~~~

I think neurone transmitters are chemicals that help 'diffuse' the electrical impulses across synapses (the junctions/space where neurones meet). Something along those lines. Check bbc bitesize, has some good info (i believe it has a video too!)

 

[christopher g]

Hi guys, any tips for Biology paper 32 tomorrow? Like what topics are most likely to come out, and which topics are usually the big points? What do you have to know to ace tomorrow's test? Any help will be greatly appreciated!

 

[XxChampXx]

Guys can you help me with IGCSE Biology Oct Nov 2014 QP 12 Q16? Thank you in advance.

Link:- https://drive.google.com/folderview...sp=drive_web&tid=0BzumkDfi9230M2JLUXZQZ0cyemM

 

[saadiee]

Can anyone tell what is the most difficult biology paper 5090/12 and 5090/22 (Mcq and theory) yet??

 

[christopher g]

Guys can you help me with IGCSE Biology Oct Nov 2014 QP 12 Q16? Thank you in advance.

Link:- https://drive.google.com/folderview...sp=drive_web&tid=0BzumkDfi9230M2JLUXZQZ0cyemM

I need help with this too..

 

[sj0007]

I need help with this too..

I had the same doubt but someone cleared it to me...... Take a look here:
https://www.xtremepapers.com/commun...t-your-doubts-here.11053/page-397#post-906301

 

[sj0007]

Guys can you help me with IGCSE Biology Oct Nov 2014 QP 12 Q16? Thank you in advance.

Link:- https://drive.google.com/folderview...sp=drive_web&tid=0BzumkDfi9230M2JLUXZQZ0cyemM

Take a look at the above link to the page where I asked the same question....... Hope it helps!

 

[christopher g]

Hello. Can someone tell me how to calculate this? The answer is D.
View attachment 52312

has anyone replied to this question?

 

[qwertypoiu]

has anyone replied to this question?

I think it's an AS LEVEL question. But here's the answer.

 

[XxChampXx]

Take a look at the above link to the page where I asked the same question....... Hope it helps!

Thanks

 

[Ch.Walid]

Here's a great video explaining trends in the periodic table.

Trends in the periodic table

 

[Tozu Fofo]

Do the graphs usually come in paper 3?

 

[Tozu Fofo]

(Structured answer paper: You will get graph questions here, and possibly a drawing
exercise. You must be able to compare 2 diagrams and spot and then explain
differences/similarities.)
Do they also come in paper 3?

 

[Muaaz Iqbal]

Do the graphs usually come in paper 3?

Yea, Especially Sigmoid Graph's

 

[Kiara P.]

Can someone help me with this question in 0610O/N/2013
q2 PART B (i) and (ii)..?

It got me confused

 

[Tozu Fofo]

What about "Structured answer paper"?

 

[christopher g]

Hi guys! Are epithelial cells and goblet cells the same? If not, can u help define each of them? Because my book says the villus is covered w goblet cells but the mark scheme to qp32 M/j 2014 BIOLOGY says they are epithelial cells (it is in question 5b).

Many thanks!