Igcse edexcel 11th june 2018 biology 2b:

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Reply 20

lemonpop123

Original post by leloswany

no the second part of that question, that isnt the exact words i wrote though!

Ooh okay gotcha

Reply 21

lemonpop123

Original post by lemonpop123

Ooh okay gotcha

I’m trying to make an unofficial mark scheme so if anyone can remember the questions please tell me them

Reply 22

leloswany

Original post by lemonpop123

Ooh okay gotcha

yuppp, what did you write for the type of reproduction with bulbs?

Reply 23

Ailurophile03

how many marks were for the calculations

Reply 24

leloswany

Original post by lemonpop123

I’m trying to make an unofficial mark scheme so if anyone can remember the questions please tell me them

0.1 for the calculation question

Reply 25

leloswany

Original post by cieloceleste

how many marks were for the calculations

i think it was 2

Reply 26

lemonpop123

Original post by leloswany

yuppp, what did you write for the type of reproduction with bulbs?

Lol I got pretty much that whole page wrong but I wrote asexual reproduction I think that’s right

Reply 27

leloswany

Original post by lemonpop123

Lol I got pretty much that whole page wrong but I wrote asexual reproduction I think that’s right

ah ok thats good because i wrote asexual, and what was the other organism because i am sure i got that wrong

Reply 28

lemonpop123

Original post by leloswany

ah ok thats good because i wrote asexual, and what was the other organism because i am sure i got that wrong

Apparently it was stem or runner something like that but I mean I wrote leaf 😂it was the only plant organ I could think of

Reply 29

leloswany

Original post by lemonpop123

Apparently it was stem or runner something like that but I mean I wrote leaf 😂it was the only plant organ I could think of

😜 hehe, i just wrote root hair cell so I definitely think that was wrong!

Reply 30

mrbubbles123

It was runners, because thats what strawberries use for asexual reproduction. Maybe you weren't taught that :tongue:

Anyone else think that the first paper was actually much harder?

Reply 31

leloswany

Original post by mrbubbles123

It was runners, because thats what strawberries use for asexual reproduction. Maybe you weren't taught that :tongue:

Anyone else think that the first paper was actually much harder?

I was taught it I just forgot it in my exam, I didnt think a runner was an organism....😂,
Yeah I agree paper 1 was a hit harder.

Reply 32

cr_13

Was it restriction and ligase enzymes for putting the plant pesticide in the yeast cell? And how the hell does one grow yeast cells in a fermenter (to do with spores I presume?)?

Reply 33

yoongles

Original post by lemonpop123

Loads of my friends did that but I was confused because I thought the question said how could you test for the importance of light in photosynthesis using a leaf so I thought it had to be specifically and only the organ of the leaf but anyways . I said you can test for starch ,as glucose is a by production of photosynthesis etc... you probs know the experiment then I said repeat it keep carbon dioxide levels the same and same temperature . What did you put for question about why the temp of the water bath had to be monitered ?

idk i think that is right i heard a lot of people who said that also i just realised i forgot to put variables lol great. i think canadian pondweed is like... made up of leaves also it was under experiments on rate of photosynthesis and light in the cgp guide so maybe it will be right also lmao... also for that one i really had no idea i put to make sure its not at a temperature that would affect rate of reaction by slowing down enzymes and also make it a fair test because i had no idea lol. what did u say

Reply 34

Luka8

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

Reply 35

Luka8

And why water is needed for germenation it was for 2 marks , I just wrote site for metabolic reactions , I think that is for only one mark?
The last question,is writing blood vessels in skin diagram label is ignored or right?

Reply 36

Jadelrx

Original post by Luka8

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

It said in the passage about rainfall, so I put that the cycle needs to be quick due to rainfall not happening often

Reply 37

lemonpop123

Original post by yoongles

idk i think that is right i heard a lot of people who said that also i just realised i forgot to put variables lol great. i think canadian pondweed is like... made up of leaves also it was under experiments on rate of photosynthesis and light in the cgp guide so maybe it will be right also lmao... also for that one i really had no idea i put to make sure its not at a temperature t would affect rate of reaction by slowing down enzymes and also make it a fair test because i had no idea lol. what did u say

I wrote two things cuz I wasn’t sure but basically I wrote two much of a high temp will denature enzymes needed for photosynthesis to occur , then in really small writing I wrote something about photosynthesis I hope they ignore that lmao

Reply 38

young_shotter

Original post by yoongles

Yess finally someone mentions the canadian pondweed experiment, thats what i used, wonder if ill get the marks

Reply 39

yoongles

Original post by cr_13

Was it restriction and ligase enzymes for putting the plant pesticide in the yeast cell? And how the hell does one grow yeast cells in a fermenter (to do with spores I presume?)?

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