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OCR GCSE Biology A Paper 4 (Higher) - Monday, June 9, 2025 [Exam Chat]

Reply 40

nobody knows

7

Original post

by C3c3c3

I never read it mention optimum temp uhh

same..

Reply 41

C3c3c3

6

Original post

by Jupiter55

No that’s right about plasmolysing

Wait really bc I said no photosynthesis so no glucose produced so water potential is lower outside so the water exits the leaf cells

Reply 42

Jupiter55

10

Original post

by C3c3c3

Wait really bc I said no photosynthesis so no glucose produced so water potential is lower outside so the water exits the leaf cells

Not too sure why you would add photosynthesis in. I said about the sticky thing the bacteria produces blocking the xylem, so water cannot go through to leaves and there’s a loss of turgor pressure so the leaf cells become flaccid/plasmolysed can’t remember which one I put.

Reply 43

C3c3c3

6

Original post

by Jupiter55

Not too sure why you would add photosynthesis in. I said about the sticky thing the bacteria produces blocking the xylem, so water cannot go through to leaves and there’s a loss of turgor pressure so the leaf cells become flaccid/plasmolysed can’t remember which one I put.

Wait no that’s what I put I just put one line abt photosynthesis that no water = no photosynthesis but apart from that I put the same

Reply 44

studious_komi

5

Original post

by Jupiter55

Not too sure why you would add photosynthesis in. I said about the sticky thing the bacteria produces blocking the xylem, so water cannot go through to leaves and there’s a loss of turgor pressure so the leaf cells become flaccid/plasmolysed can’t remember which one I put.

Yes I wrote that but also mentioned transpiration for some reason and maybe osmosis which is probably pushing it... I don't remember if I wrote flaccid though so potentially 3/4 marks or 2 if they hate me 😃

Reply 45

C3c3c3

6

Original post

by studious_komi

Yes I wrote that but also mentioned transpiration for some reason and maybe osmosis which is probably pushing it... I don't remember if I wrote flaccid though so potentially 3/4 marks or 2 if they hate me 😃

Yeah I put transportation and osmosis aswell ahah don’t worry

Reply 46

Fthfy

3

I got that maths question weong

Reply 47

183483279435829

9

Original post

by C3c3c3

Idk bc I thought u couldn’t have half a dandelion

Damn I rounded up.

Reply 48

183483279435829

9

Original post

by asin09

For the calculation I got 0.005 for the leaves wilting I put water can't be transported through the xylem so less photosynthesis and the leaf dries up.

I'm annoyed I didn't put that. I basically used the logic of malaria so i said that the beetle is a vector for the bacterium as part of the bacterium's life cycle takes place inside the beetle, so i said that when the beetle feeds on the plant the bacterium is inserted into the xylem vessel where it then produces the sticky substance that makes it wilt. so annoyed i didn't think of what the xylem actually does, hoping it's like any 4 from, but tbh as i was writing it i almost didn't believe it could be worth 4 marks.