Percentage Uniform Marks (PUM) Explained: A Comprehensive Guide
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Amal Elsayed
Kuwait
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11,161 responses
Guys ! How was the biology paper 3 ?
hey guys any tips for literature?
how was the bio paper 32, i thought it was okay but it was a bit too lengthy didnt have time to finish URG
what was the answer for the hydrogen carbonate thingy and what about the last questionnnn
and the goblet cells what do they even do?
goblet cells produce mucus. cilia moves it to throat. I left the hydrogen carbonate question :/ watd you write for the RBC one? like why 0.10 bursts?? I got SO confused for that! is it like osmosis or smthn idk
it was like more substances got in the red blood cells making them burst n the one that asked y dont plant cell burst its bcoz they have cell wall
for me it was really easy but true was very lengthy 🙂
dude! its osmosis because of high water potential outside but low water potential inside the cell…
basically, the red blood cells in the 0.10 solution burst because there is a higher water potential gradient outside of the cell. The water enters the red blood cell and the cell bursts becuase it doesn’t have a cell wall to hold it in place. The blood cells in the solutions after 0.15 became crenated. The paper was a bit too long. For the pH i wrote 7.6
So for the hydrogen carbonate it turns yellow because it neutralizes the carbon dioxide. That’s what everyone in my group got I don’t know! That’s what I wrote as well. And for the red blood cell, the water concentration outside the cell i very high much more than that of the cell. The salts level in the cell are higher. Water will move through the membrane by osmosis from a region of high to low concentration. The blood cell has a lot of water so the water presses against membrane and so it lyses.
Dude, personally it was like one of the easiest papers of biology for me, because it was way easier than the past papers. Plus, they didn’t ask any genetics stuff and the questions were pretty straight-forward. The Sodium Hydrogen Carbonate question was pretty obvious. It had to be purple because, with greater light intensity, more photosynthesis occurs, thus increasing the Carbon Dioxide intake. This causes the pH to increase, and the colour to change to purple.
Humza is apu…u no
But how did the pH increase beyond 7.0 because there were no alkaline substances.
It should be purple (ph9). This question was not about neutralization.We are not expected to know what neutralization is in biology. We learn that in chemistry. Anyway, hydrogen carbonate is an alkali. The carbon dioxide and water present get used up during photosynthesis. Was it mentioned that the jar containing algae was filled with carbon dioxide? No. Air has little carbon dioxide in it which might combine with the water to form carbonic acid. But that little carbon dioxide gets used up and oxygen is formed.
I wrote that it would be yellow. While the CO2 would be absorbed, glucose and water (which are produced by photosynthesis) are not alkaline and so the pH wouldn’t increase much past 7 (yellow was 7.6).
Bio was easy
Where can I get the audio files for spanish foreign language listening papers?
theres a link above the accounting folder
Any tips for chem exam ..32
bet it gonna be harder!!!! i suffered for bio p32
I agree its gonna be tougher, since the practical was very easy…
Humza hi. Is that really u? Haha jk I no who u r
Well, I have been told that chromatography paper ALWAYS comes in paper 3 and there will be a question about it, so study it well.