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Author Topic: [IMPORTANT]20/5/2010 Biology Paper 6  (Read 19102 times)

Offline Ivo

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Re: 20/5/2010 Biology Paper 6
« Reply #30 on: May 19, 2010, 07:01:29 pm »
Does anyone have any idea?  Please see my previous post
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Offline biro

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Re: 20/5/2010 Biology Paper 6
« Reply #31 on: May 19, 2010, 07:06:45 pm »
Quote from: Ivo on May 19, 2010, 06:47:07 pm
This was from the ER for this question.  I'm concerned about the 2nd sentance, does it mean the micropyle is not at C, and in fact the blue line is correct?  Please can someone explain!

SOMEONE PLEASE HELP!
I got this answer from my past papers...I solved it with my teacher Dr. Hala Mahfouz (Best IGCSE teacher 2008 & 2009)

Mark Scheme: C – ovule/embryo sac...this means that it must enter through c !!
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Offline 33oomar

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Re: 20/5/2010 Biology Paper 6
« Reply #32 on: May 19, 2010, 07:09:51 pm »
Quote from: 33oomar on May 19, 2010, 06:46:42 pm
Homies i need help
I cant understand what exactly is "controlling the experiment "
and i also need help in doin paper 6 ....
wish me luck
and By the way paper 4 math sucked today it was so f**kin hard ....
well alhamdouliallah for everything

i need some help[ here guys pleeeeaaaaaaaaaaase :'(
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Offline takamorinki

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Re: 20/5/2010 Biology Paper 6
« Reply #33 on: May 19, 2010, 07:13:02 pm »
must we know the chemicals used in the experiments byheart? ???
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Offline ahmed_eg

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Re: 20/5/2010 Biology Paper 6
« Reply #34 on: May 19, 2010, 07:13:59 pm »
biro

ana madraset tiba el heya CBS
e7na bnemte7en 3ndoko
CBS lebso azra2 keda :D
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Offline Ivo

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Re: 20/5/2010 Biology Paper 6
« Reply #35 on: May 19, 2010, 07:14:27 pm »
Quote from: 33oomar on May 19, 2010, 07:09:51 pm
i need some help[ here guys pleeeeaaaaaaaaaaase :'(

Using a control in an experiment.

So say catalase (enzyme) breaks down hydrogen peroxide into water and oxygen.

Then normally, you put the catalase into test tube and see if there is effervescence.

The control for this experiment would be: don't add catalase into test tube, and see what is the observation (should be no effervescene).

Therefore the purpose of the control for this experiment is to ensure that catalse is what causes oxygen to be produced, and not any other factor/variable.

Has that helped?
« Last Edit: May 19, 2010, 07:18:06 pm by Ivo »
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Offline ahmed_eg

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Re: 20/5/2010 Biology Paper 6
« Reply #36 on: May 19, 2010, 07:16:11 pm »
ivo

is the control
like
temperature
amount of reactant
kind of seeds
stuff like that?
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Offline Ivo

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Re: 20/5/2010 Biology Paper 6
« Reply #37 on: May 19, 2010, 07:19:02 pm »
Quote from: ahmed_eg on May 19, 2010, 07:16:11 pm
ivo

is the control
like
temperature
amount of reactant
kind of seeds
stuff like that?

No those are variables.  See my previous post.  Hopefully, I've explained it well!
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Offline Vin

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Re: 20/5/2010 Biology Paper 6
« Reply #38 on: May 19, 2010, 07:22:38 pm »
Quote from: Ivo on May 19, 2010, 06:47:07 pm
This was from the ER for this question.  I'm concerned about the 2nd sentance, does it mean the micropyle is not at C, and in fact the blue line is correct?  Please can someone explain!

SOMEONE PLEASE HELP!

I THINK ITS THE BLUE LINE !!
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Offline Vin

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Re: 20/5/2010 Biology Paper 6
« Reply #39 on: May 19, 2010, 07:24:54 pm »
Quote from: takamorinki on May 19, 2010, 07:13:02 pm
must we know the chemicals used in the experiments byheart? ???

depends .. in igcse u dont need to know complex chemicals by heart but jus the usual ones .. anything in specific u want ??
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Offline ahmed_eg

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Re: 20/5/2010 Biology Paper 6
« Reply #40 on: May 19, 2010, 07:25:44 pm »
now guys
i have a question
what r the phases of yeast population like in population curve

source: november 2005 paper 6 question 3 b      http://www.freeexampapers.us/IGCSE/Biology/CIE/2005%20Nov/0610_w05_qp_6.pdf
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Offline Ivo

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Re: 20/5/2010 Biology Paper 6
« Reply #41 on: May 19, 2010, 07:26:06 pm »
Quote from: ~VIN1094~ on May 19, 2010, 07:22:38 pm
I THINK ITS THE BLUE LINE !!

Depends what is an integument!

By the way, are you doing the exam tomorrow?
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Offline dodi23

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Re: 20/5/2010 Biology Paper 6
« Reply #42 on: May 19, 2010, 07:26:33 pm »
vin do we hv 2 noe these diagrams???
cz they rent in any of my books!! :-[
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Offline Ivo

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Re: 20/5/2010 Biology Paper 6
« Reply #43 on: May 19, 2010, 07:27:21 pm »
Quote from: ahmed_eg on May 19, 2010, 07:25:44 pm
now guys
i have a question
what r the phases of yeast population like in population curve

source: november 2005 paper 6 question 3 b      http://www.freeexampapers.us/IGCSE/Biology/CIE/2005%20Nov/0610_w05_qp_6.pdf

Lag phase, Log (exponential) phase, stationary phase, death phase.
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Offline Ivo

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Re: 20/5/2010 Biology Paper 6
« Reply #44 on: May 19, 2010, 07:27:52 pm »
Quote from: dodi23 on May 19, 2010, 07:26:33 pm
vin do we hv 2 noe these diagrams???
cz they rent in any of my books!! :-[

Nah!  You might get asked to draw stuff, but they give you a copy for you to do so anyway!
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