Igcse edexcel 11th june 2018 biology 2b:

Surely the independent is light? what your saying could be right too.

Yeah the independent variable is objectively the light, as the cloud change relies on the photosynthesis rate, which relies on the light intensity

Reply 81

Kaiser Reich

4

Original post by Luka8

Guys the question about why the plant need to reproduce in a quickly cycle?

I wrote to conserve and reduce the energy wasted

Reply 82

Kaiser Reich

4

Original post by yoongles

yeah thats what i put. also for yeast i said sterilize the fermentor with steam, then put the yeast in a growth or nutrient culture, and put it in the fermentor, use PH and temperature measures to make sure PH and temp are optimum for enzymes, pump oxygen into the fermentor so the yeast can respire and use paddles to turn the mixture so the oxygen is evenly spread

Does it have to be in that order? I just wrote four related things, but did in an order that wasn't exactly chronological.

Reply 83

Kaiser Reich

4

I think you had to mention to reduce water lost by the leaves through transpiration as water vapour? You might be right

Original post by cieloceleste

as it is in the desert, it receives a lot of sunlight hence lots of photosynthesis occurs, i know this wrong but i didnt know what to say, what did u write

Reply 84

mrbubbles123

10

Original post by DanCantDraw

Couldn't stems also be considered because of cuttings?

That's cloning, and not really natural asexual reproduction, so I don't think so.

Reply 85

LisaR2016

7

Original post by Jadelrx

What did you put for the natural pesticide question?

I rambled on about to stop them decomposing (probably wrong) what did you write

Reply 86

LisaR2016

7

Original post by Kaiser Reich

I wrote to conserve and reduce the energy wasted

I wrote about seeds being unable to germinate without rainfall so it needs to be a quick process before spring

Reply 87

Kaiser Reich

4

Original post by LisaR2016

I wrote about seeds being unable to germinate without rainfall so it needs to be a quick process before spring

Ah heck, that makes more sense
thanks for the help :smile:

Reply 88

DanCantDraw

3

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Original post by Shafkat696

Can we write arteriole instead of capillary

I did a(I think it was 2015) past paper. If you put capillaries they negate you marks, so it's arterioles

Reply 89

DanCantDraw

3

Original post by mrbubbles123

That's cloning, and not really natural asexual reproduction, so I don't think so.

It is part of asexual reproduction. You can read it in the book :P

Reply 90

yoongles

12

Original post by Kaiser Reich

I think you had to mention to reduce water lost by the leaves through transpiration as water vapour? You might be right

i said about transpiration and evaporation for question 1 haha. im talking about the question why do desert plants not suffer from having smaller leaves

Reply 91

yoongles

12

Original post by DanCantDraw

It is part of asexual reproduction. You can read it in the book :P

it is asexual reproduction, but through micro-propagation or other forms of cloning by man, so cuttings or explants therefore are not considered ORGANS for asexual reproduction (because they arent organs just bits of stem), which is what the question asked, so i dont think its right, i think you had to say runners/tubers/ovary or any actual organ to get the mark. it was only one mark tho so...

Reply 92

Jadelrx

13

I know this is the biology thread but for whoever is doing chemistry tomorrow how are you feeling about it? Which topics do you find the hardest?

Reply 93

amazingfcb

11

Original post by Jadelrx

I know this is the biology thread but for whoever is doing chemistry tomorrow how are you feeling about it? Which topics do you find the hardest?

It’s gonna be hard af

Reply 94

Jadelrx

13

Original post by amazingfcb

It’s gonna be hard af

lol probably! Paper 1 wasn't too bad though. What topics don't you like? For me it's moles (although I can do the empirical and molecular formula), equilibrium, titration calculations and bond energy calculations, (BASICALLY I DON'T LIKE CALCULATIONS lol) I know they are going to come up though so I'm trying to look over them right now.

Reply 95

amazingfcb

11

Original post by Jadelrx

lol probably! Paper 1 wasn't too bad though. What topics don't you like? For me it's moles (although I can do the empirical and molecular formula), equilibrium, titration calculations and bond energy calculations, (BASICALLY I DON'T LIKE CALCULATIONS lol) I know they are going to come up though so I'm trying to look over them right now.

My g same

Reply 96

21stylish

11

What about the starch test? Like remove chlorophyll cover a part of the leaf and then let it photosynteseize . After that check using iodine whther starch is present and the covered part as well

Reply 97

DanCantDraw

3

Original post by yoongles

it is asexual reproduction, but through micro-propagation or other forms of cloning by man, so cuttings or explants therefore are not considered ORGANS for asexual reproduction (because they arent organs just bits of stem), which is what the question asked, so i dont think its right, i think you had to say runners/tubers/ovary or any actual organ to get the mark. it was only one mark tho so...