question about core practical : photosynthesis gcse

Watch
adoreapple
Badges: 10
Rep:
?
#1
Report Thread starter 4 weeks ago
#1
This question is about the practical on the effect of light intensity on rate of photosynthesis
If light intensity is highest in the boiling tube closest to the lamp, why doesn't the indicator turn yellow instead of turning purple, as rate of photosynthesis is higher in that tube so there's more CO2? Is it because more CO2 is being turned into oxygen so its being removed and so there's actually less CO2??

I'm not really sure and I need clarification as I have an exam soon. Any help appreciated.
0
reply
cbrr
Badges: 10
Rep:
?
#2
Report 4 weeks ago
#2
(did this over a year ago, bare with if I'm wrong)

Light intensity (or sunlight) is what fuels photosynthesis, the energy that can take the input (H20 and CO2) and turn them into the output (O2 and C6H1206 / glucose [for the plant]) within the chlorophyll in the plant's chloroplasts. I'm not too sure about indicators, we didn't even cover them and I don't remember them being in the revision book when I was revising for my June mocks (for trilogy) (I'm yr 11 now), but if the lamp is closer to the tube with the plant / weed-thing, it's going to be able to make more glucose for itself, therefore in the tube there will also be more O2 (bubbles if the plant is underwater), and less CO2 and H2O.
Just remember that C₆H₁₂O₆ is what the plant wants, it gets the C6 from the CO2, the O from both the CO2 and H2O and the H from the H2O. If it has more energy to make glucose, it will (but see limiting factors at that point lol).

Hope this is right! Good luck on your test!! You'll do amazing.
0
reply
adoreapple
Badges: 10
Rep:
?
#3
Report Thread starter 4 weeks ago
#3
(Original post by cbrr)
(did this over a year ago, bare with if I'm wrong)

Light intensity (or sunlight) is what fuels photosynthesis, the energy that can take the input (H20 and CO2) and turn them into the output (O2 and C6H1206 / glucose [for the plant]) within the chlorophyll in the plant's chloroplasts. I'm not too sure about indicators, we didn't even cover them and I don't remember them being in the revision book when I was revising for my June mocks (for trilogy) (I'm yr 11 now), but if the lamp is closer to the tube with the plant / weed-thing, it's going to be able to make more glucose for itself, therefore in the tube there will also be more O2 (bubbles if the plant is underwater), and less CO2 and H2O.
Just remember that C₆H₁₂O₆ is what the plant wants, it gets the C6 from the CO2, the O from both the CO2 and H2O and the H from the H2O. If it has more energy to make glucose, it will (but see limiting factors at that point lol).

Hope this is right! Good luck on your test!! You'll do amazing.
Thank you!
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

Have you made your mind up on your five uni choices?

Yes, and I've sent off my application! (148)
54.61%
I've made my choices but havent sent my application yet (37)
13.65%
I've got a good idea about the choices I want to make (31)
11.44%
I'm researching but still not sure which universities I want to apply to (26)
9.59%
I haven't started researching yet (16)
5.9%
Something else (let us know in the thread!) (13)
4.8%

Watched Threads

View All