GCSE OCR 21st Century Triple Science (CBP1-7) Thread

Reflexes don't go through the CNS I don't think? I think you will have got 4 or 5 marks but I think it as:

stimuli-----------Receptor----Sensory neurone-----relay neuron----------motor neurone---------effector-----------response

Relay neuron is within the cns, so they technically do, I made the mistake of differentiating the 2 in the exam :rolleyes:

Reply 1361

lyricalvibe

16

Original post by olmyster911

I'M STILL ON P5 :angry:

hahaha

Hah, at least you'll know it well :biggrin:

it really is badly explained to be honestbecause the science is trickier :/ I'm just gonna have to do loads of practice with it :/

Reply 1362

username1344042

6

Original post by DDan123

Aha electricity and circuits isn't that bad! You actually get used to all the terminology and how they work e.g current, resistance, p.d, resistors, motors etc. Or maybe it's just me? :tongue:

It's just you! :tongue:

Reply 1363

User1452521

2

Has anyone done the January 2013 physics paper? It's so ****ing stupid the questions make no ****ing sense whatsoever! Every physics exam tries to **** you over one way or another

Posted from TSR Mobile

Reply 1364

ToLiveInADream

17

I'm feeling a little more confident with this exam, surprisingly! A day before the exam and I'm finally comfortable with the topics....oookay then, logic..

Reply 1365

lyricalvibe

16

Original post by brodingoson

Has anyone done the January 2013 physics paper? It's so ****ing stupid the questions make no ****ing sense whatsoever! Every physics exam tries to **** you over one way or another

Posted from TSR Mobile

And so is the way of physics :rolleyes:

I'm guessing you're buzzing for the exam tomorrow :wink:

Reply 1366

username1344042

6

Original post by lyricalvibe

Hah, at least you'll know it well :biggrin:

it really is badly explained to be honestbecause the science is trickier :/ I'm just gonna have to do loads of practice with it :/

I don't understand it despite studying it for ages!

Yeah, I'll do what you're doing too :confused:

Reply 1367

ToLiveInADream

17

Original post by brodingoson

Has anyone done the January 2013 physics paper? It's so ****ing stupid the questions make no ****ing sense whatsoever! Every physics exam tries to **** you over one way or another

Posted from TSR Mobile

It was heaven compared to June 13! 6 markers are fairly nice..the P5 one is fairly dodgy but all we really need to know is that stationary ions in the wire collide with charges which creates kinetic energy and thus heating. And add some data in!

Reply 1368

azo

8

Original post by Sulfur

The question was:

"Animals respond to changes in their environment. A predator appears and causes a rapid response in a squirrel. Suggest what this response might be. Describe the processes that occur in the squirrel to cause this rapid response."

The rapid response bit implies it was a reflex, where the information isn't processed. So I don't think you talk about the CNS as the brain doesn't decide what to do, as it is involuntary. IDEK, you have an impressive memory to recall that question!

Original post by lyricalvibe

Relay neuron is within the cns, so they technically do, I made the mistake of differentiating the 2 in the exam :rolleyes:

I just had a look at the spec and you are correct that relay neurons are in the CNS, so it isn't wrong but I don't think you talk about it co-coordinating a response or anything as
understand that this arrangement of neurons into a fixed pathway allows reflex responses to be automatic and so very rapid, since no processing of information is
required

Reply 1369

Sulfur

OP

Original post by brodingoson

Has anyone done the January 2013 physics paper? It's so ****ing stupid the questions make no ****ing sense whatsoever! Every physics exam tries to **** you over one way or another

Posted from TSR Mobile

I've looked at it and I just think... what the hell. The questions seem to want answers that you'd never think of and the marks awarded for some points is ridiculous.

Reply 1370

ToLiveInADream

17

I actually love those Vp/Vs turns on the transformer questions now..hope it comes up tomorrow :colone:

Reply 1371

User1452521

2

Original post by ToLiveInADream

It was heaven compared to June 13! 6 markers are fairly nice..the P5 one is fairly dodgy but all we really need to know is that stationary ions in the wire collide with charges which creates kinetic energy and thus heating. And add some data in!

Naa last June was heaven compared to jan

Posted from TSR Mobile

Reply 1372

ToLiveInADream

17

Original post by brodingoson

Naa last June was heaven compared to jan

Posted from TSR Mobile

Suppose it's about opinion but man..that P5 6 marker for June is not even..ughh I can't even

Reply 1373

student97

11

well atleast turn out to be low since everyone finds it hard! 34/60 in physics last year for an A*!!!
OCR always expect stuff in the 6 markers that hardly relate to the question, so I think it's best if you go in to alot of detail, i do this is 3 markers as well, just to be safe!!

(edited 9 years ago)

Reply 1374

lyricalvibe

16

Original post by azo

The rapid response bit implies it was a reflex, where the information isn't processed. So I don't think you talk about the CNS as the brain doesn't decide what to do, as it is involuntary. IDEK, you have an impressive memory to recall that question!

I just had a look at the spec and you are correct that relay neurons are in the CNS, so it isn't wrong but I don't think you talk about it co-coordinating a response or anything as
understand that this arrangement of neurons into a fixed pathway allows reflex responses to be automatic and so very rapid, since no processing of information is
required

Yeah I know, I said that I differentiated the 2 as separate areas, doing that is wrong, all a relay neuron is is a specialized part of the cns specific for reflexes and yes no information is processed. My point was simply that saying the cns was in a different place than the relay neuron is incorrect, the nervous impulse always takes the same pathway into the cns to the relay neuron as the spec says but in less detail. - But yes the question was talking about the reflex arc
Did you mention the synapse?

(edited 9 years ago)

Reply 1375

Amyjonesx

2

39 marks for an A* in june 2012 :frown:

Reply 1376

username1344042

6

Can anyone explain half life to me? :confused:

Reply 1377

monisj1

1

is it likely rutherford could come up tomorrow?

Reply 1378

Isabella~

1

How would you answer "Explain how an AC current is made as opposed to a DC current"?

Reply 1379

student97

11

Original post by olmyster911

Can anyone explain half life to me? :confused:

im sure someone else can help better, but basically:

the atom's nucleus is unstable and wants to get stable, so it emits radioactive rays (alpha, beta or gamma)randomly, however there is a pattern because more and more atoms are becoming stable and there are less unstable atoms left, so less radiation is emitted, so less activity. half life is the amount of time it takes for activity to reduce by half, or the time taken for half the sample to 'decay' (become stable.

"the time taken for half of a radioactive sample to decay/
time taken for activity to drop to ½" - one mark answer for JAN 2013 paper on halflife

GCSE OCR 21st Century Triple Science (CBP1-7) Thread

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