Yes thanks for asking! In real life, it is more difficult to count bcs it's hard to keep track of whether you have seen 50cells, and whether you may have accidentally recounted the same cell twice... What i ask students to do is, find a field of view, dont move it. Count the total cells, count the plasmolysed cells. Write it down. Repeat this 1-2times again in a completely different field of view. Then, calculate the average percentage of plasmolysed cells. Then calculate how many plasmolysed cells out of 50 that would be.
do u have tips on how to count ?? i dont think our centre allows photography to mark later on we have to do them directly from the lens so it feels tricky...
Can you draw a plasmolysed cell with only one line for cell wall and one line for cell membrane which is completely detached and not any part of the membrane touching the cell wall
No, cell wall must have two lines unfortunately... If turgid, cell membrane can share one line, but if plasmolysed, cell membrane needs its own line. Cell wall still needs two lines ALWAYS
thankyou for the video
i did it a few days ago and had trouble counting the number of cells
how do you advice students to do this
Yes thanks for asking! In real life, it is more difficult to count bcs it's hard to keep track of whether you have seen 50cells, and whether you may have accidentally recounted the same cell twice...
What i ask students to do is, find a field of view, dont move it. Count the total cells, count the plasmolysed cells. Write it down. Repeat this 1-2times again in a completely different field of view.
Then, calculate the average percentage of plasmolysed cells. Then calculate how many plasmolysed cells out of 50 that would be.
do u have tips on how to count ?? i dont think our centre allows photography to mark later on we have to do them directly from the lens so it feels tricky...
Just do your best, missing a couple is okay
Hope your exam went well! And yep missing some is ok. As long as your results show the correct trend of results.
@maybemay5499 omg this is unrelated but I love your Wen Kexing profile picture!! It’s rare to see a Word Of Honor fan :>
miss is there any experiment regarding alginate beads?
It's not that common of an experiment in P3...
I also have the same question
Hello, I have a question, how did you calculate the percentage of cells that were plasmolysed?
Count the plasmolysed cells in field of view , divide by total cells in the field of view x100
Do it multiple times, get a mean
Can you draw a plasmolysed cell with only one line for cell wall and one line for cell membrane which is completely detached and not any part of the membrane touching the cell wall
No, cell wall must have two lines unfortunately... If turgid, cell membrane can share one line, but if plasmolysed, cell membrane needs its own line. Cell wall still needs two lines ALWAYS
WE HAVE TO COUNT????
haha yup, or you know, estimate.
why is it in between 0.4 - 0.6 and not 0.2-0.4
The transition of results from 0.0 to something is btwn 0.4-0.6