Teenw123
Badges: 2
Rep:
?
#1
Report Thread starter 5 years ago
#1
For the 3 marker Why did the CO2 levels in the flask increase I wrote:

Microorganisms break down the grass taking in the carbon. When they respire they release CO2 which is trapped due to the cotton wool blocking its escape, causing it to build up in the flask.

For the second part I wrote that all the grass had been decomposed.
0
reply
kallum3237
Badges: 0
Rep:
?
#2
Report 5 years ago
#2
Just because the grass has been decomposed doesn't mean the microbes aren't respiring, the second part I think was that the microbes had died because either the they had run out of food(grass) or oxygen
0
reply
1jonam16
Badges: 10
Rep:
?
#3
Report 5 years ago
#3
The cotton wool allows gases to flow in and out, by your logic if it prevented gases leaving then oxygen would't be able to enter too. But the marks I think are as follows:
1) Decomposers such as bacteria and fungi will decompose the rotting matter.
2)They then use the nutrients, such as glucose in AEROBIC respiration
3) By product of this is CO2 which is released
0
reply
kallum3237
Badges: 0
Rep:
?
#4
Report 5 years ago
#4
(Original post by 1jonam16)
The cotton wool allows gases to flow in and out, by your logic if it prevented gases leaving then oxygen would't be able to enter too. But the marks I think are as follows:
1) Decomposers such as bacteria and fungi will decompose the rotting matter.
2)They then use the nutrients, such as glucose in AEROBIC respiration
3) By product of this is CO2 which is released
The cotton wool doesn't gases to flow in and out otherwise the graph wouldn't have shown an increase in CO2, it would have stayed constant the CO2 would have moved out due to diffusion
0
reply
1jonam16
Badges: 10
Rep:
?
#5
Report 5 years ago
#5
(Original post by kallum3237)
The cotton wool doesn't gases to flow in and out otherwise the graph wouldn't have shown an increase in CO2, it would have stayed constant the CO2 would have moved out due to diffusion
It allows the gases to seep through, so oxygen can enter. However, some co2 would be lost, since cotton can't cover the entire gap. And secondly, I think you can imply the micro-organisms die as a result of lack of food as its 20 days after, but the main point is that all of the grass had decayed.
0
reply
BobbiBlue
Badges: 14
Rep:
?
#6
Report 5 years ago
#6
At least you didn't put that plants respire instead of microorganisms 😓 I think I got that whole section wrong


Posted from TSR Mobile
0
reply
apps2000
Badges: 3
Rep:
?
#7
Report 5 years ago
#7
(Original post by Teenw123)
For the 3 marker Why did the CO2 levels in the flask increase I wrote:

Microorganisms break down the grass taking in the carbon. When they respire they release CO2 which is trapped due to the cotton wool blocking its escape, causing it to build up in the flask.

For the second part I wrote that all the grass had been decomposed.

theres literally no point in trying to find out whether or not you got a question right or not.
The exam is OVER. move on with your life!
0
reply
InneRs
Badges: 9
Rep:
?
#8
Report 5 years ago
#8
(Original post by 1jonam16)
The cotton wool allows gases to flow in and out, by your logic if it prevented gases leaving then oxygen would't be able to enter too. But the marks I think are as follows:
1) Decomposers such as bacteria and fungi will decompose the rotting matter.
2)They then use the nutrients, such as glucose in AEROBIC respiration
3) By product of this is CO2 which is released
You don't have to put aerobic because it's not in core
0
reply
1jonam16
Badges: 10
Rep:
?
#9
Report 5 years ago
#9
(Original post by InneRs)
You don't have to put aerobic because it's not in core
Last year the answer to one of the questions was enzymes denatured and ribosomes - these are very easy ideas and are most prominent in B2 yet still turned up.
0
reply
dh1347
Badges: 0
Rep:
?
#10
Report 5 years ago
#10
the microbes had died due to a lack of oxygen in the flask because they had released so much co2 there was not any oxygen left for respiration
0
reply
1jonam16
Badges: 10
Rep:
?
#11
Report 5 years ago
#11
(Original post by dh1347)
the microbes had died due to a lack of oxygen in the flask because they had released so much co2 there was not any oxygen left for respiration
The most obvious answer is that decomposition had finished, but you may have got it wrong, because there;s always oxygen in the flask, since the cotton allows gases to move in and out.
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

Should the school day be extended to help students catch up?

Yes (56)
29.02%
No (137)
70.98%

Watched Threads

View All
Latest
My Feed