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POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

Fatima_Toomii

Fatima_Toomii

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angel G said:
Bio question
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Biology (0610)/0610_w07_qp_1.pdf
1) Q 15
2) Q 33 how will i know the answer ?
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For Q15 it says that the answer is B. From what I understood of it was that CO2 would diffuse into A, B, C and D. CO2 is not used a lot in A, C, or D so let's assume that they all have the same quantity of CO2. B, on the other hand, is a palisade cell which means its the main site of photosynthesis. Photosynthesis uses up CO2 which means the cell would have less CO2 in it after photosynthesis. Now if you compare all of these cells together, you can safely say that B would contain the least amount of CO2 in it because it carries out photosynthesis the most.

For Q33, the producer is the missing element. You can also tell by reading the question. They mentioned organisms feeding on the rat and another feeding on these organisms (so you have consumers, carnivores, and predators) but they didn't mention anything about producers. You could also tell by he picture - no producers found.

I hope that helped :D
 
Abdelrahman Amr

Abdelrahman Amr

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Razo513 said:
thinking about this logically .. we have water at the end therefore the solution becomes less acidic .. which means the pH increases​
the oxidation state of chromium stays 6+ ... as in the ionic eqn : 2CrO4 ^-2 + 2H+ ----> Cr2O7^2- + H2O .. hope u got it :D​
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dude it is very easy about the ox state u just need 2 calculate but with the PH u just have to read the question they said adding KOH to potassium dichromate so the ph of dichromate is below 7 since it is acidic so adding alkali will 4 sure increase the PH no matter to 7 or above i hope u got it ;)
 
angel G

angel G

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Fatima_Toomii said:
For Q15 it says that the answer is B. From what I understood of it was that CO2 would diffuse into A, B, C and D. CO2 is not used a lot in A, C, or D so let's assume that they all have the same quantity of CO2. B, on the other hand, is a palisade cell which means its the main site of photosynthesis. Photosynthesis uses up CO2 which means the cell would have less CO2 in it after photosynthesis. Now if you compare all of these cells together, you can safely say that B would contain the least amount of CO2 in it because it carries out photosynthesis the most.

For Q33, the producer is the missing element. You can also tell by reading the question. They mentioned organisms feeding on the rat and another feeding on these organisms (so you have consumers, carnivores, and predators) but they didn't mention anything about producers. You could also tell by he picture - no producers found.

I hope that helped :D
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Thanks aloooot for the help !! :D
 
сᴏᴏʟ сяуѕтᴀʟѕ

сᴏᴏʟ сяуѕтᴀʟѕ

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angel G

angel G

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Lujain M. said:
Q 25 : the question is about shoot not radicle... and shoot responded away from gravity (negative geotropism)
Q40: because green is the chlorophyll pigment..no chlorophyll-->no photosynthesis-->plants die ! :)
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thank u !! :)
But for Q 25 the ans is A !:confused:
 
Lujain M.

Lujain M.

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angel G said:
thank u !! :)
But for Q 25 the ans is A !:confused:
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yes it's A because the shoot "showed a response to gravity" which is negative because shoots always grow away from gravity while radicle always grows towards gravity :)
 
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