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Edexcel IGCSE Biology (Modular) Unit 1 - 13th May 2025 [Exam Chat]

22

Edexcel IGCSE Biology (Modular) Unit 1 (4WBI1 1B) - 13th May 2025 [Exam Chat]

Welcome to the exam discussion thread for this exam.
Introduce yourself! Let others know what you're aiming for in your exams, what you are struggling with in your revision or anything else.

Wishing you all the best of luck. :yy:

General Information
Date/Time: 13th May/ PM
Length: 1hr 40m

Good luck!
Click here to find exam discussions for other GCSE subjects

(edited 11 months ago)

Reply 1

Idk49636

3

Those who did the regional paper, how was it??

Reply 2

NATAIE2929

4

Original post

by Idk49636

Those who did the regional paper, how was it??

shocking

Reply 3

omarkhan 2

1

Original post

by NATAIE2929

shocking

hard?

Reply 4

tia_xxx

7

where was the human biology omg. it was only about a seed

Reply 5

melieeu

1

nothing about the eye or heart..

Reply 6

oatmealworm

9

that was horrific haha, but i think the blood composition question was repeated from another paper

Reply 7

tia_xxx

7

Original post

by melieeu

nothing about the eye or heart..

pls paper 2 better do me justice

Reply 8

hdjdhdj

1

what did everyone put for the:
-surface area of leaf
-differences between selective breeding and genetic modification
-why biological pesticides is better than normal or smth

Reply 9

Daniel_Daniel

1

Y did they ask bout parasitic in paper 1

Reply 10

naomi___9

1

Original post

by hdjdhdj

what did everyone put for the:
-surface area of leaf
-differences between selective breeding and genetic modification
-why biological pesticides is better than normal or smth

I put something about measuring the length and width woth a ruler and then multiplying them together then double for both sides
GM results in a transgenic organism SB doesnt
GM required lab and trained personnel SB doesnt
The advantages of bio control: only needs to be applied once, specific to the pest and pest can’t develop resistance

Reply 11

Jamieooo1234

1

Original post

by hdjdhdj

what did everyone put for the:
-surface area of leaf
-differences between selective breeding and genetic modification
-why biological pesticides is better than normal or smth

1.

Leaf, I literally had no idea. Just said something about a tape measure

2.

I said Genetic engineering produced transgenic plants, and I can’t remember my other one(might have left it blank)

3.

I said, they discriminate better, they are self sustaining and they don’t introduce bioaccumulation/biomagnification

Reply 12

real-detriment

2

Original post

by oatmealworm

that was horrific haha, but i think the blood composition question was repeated from another paper

is that the one with those odd diagrams then the multiple choice?!! IT WAS SO ODD

Reply 13

real-detriment

2

Original post

by hdjdhdj

what did everyone put for the:
-surface area of leaf
-differences between selective breeding and genetic modification
-why biological pesticides is better than normal or smth

for the last one i did biological is less maintenance, the crops can not build resistance to the plant and they r not harmful to the environment unlike the normal oesticices which can cause eutrification

Reply 14

mw009

1

Original post

by hdjdhdj

what did everyone put for the:
-surface area of leaf
-differences between selective breeding and genetic modification
-why biological pesticides is better than normal or smth

-place leaf on millimeter grid paper and trace leaf then count number of grids inside the tracing and x2 for both sides
-selective breeding is sexual reproduction / genetic modification is a much faster process
-biological pesticides do not harm non-target organisms / no threat of bioaccumulation and biomagnification / insects dont develop resistance to bio pesticides through natural selection like they do with chemical

Reply 15

Sim20200202

1

Original post

by hdjdhdj

what did everyone put for the:
-surface area of leaf
-differences between selective breeding and genetic modification
-why biological pesticides is better than normal or smth

I’m probably wrong but i put for SA u had to measure the length and times it by the width. For difference between selective breeding and GM i put GM is makes genetically identical and selective is long process. Biological pesticides because no bioaccumulation, specific and no need to reapply.

Reply 16

oscarrrrrrrrrr

4

Original post

by mw009

-place leaf on millimeter grid paper and trace leaf then count number of grids inside the tracing and x2 for both sides
-selective breeding is sexual reproduction / genetic modification is a much faster process
-biological pesticides do not harm non-target organisms / no threat of bioaccumulation and biomagnification / insects dont develop resistance to bio pesticides through natural selection like they do with chemical

what did you put for why keep it between 10-30 degrees celcius? the one about growing the plants for 120 days in a room

Reply 17

treestumpcheetah

3

Original post

by oscarrrrrrrrrr

what did you put for why keep it between 10-30 degrees celcius? the one about growing the plants for 120 days in a room

i think this is wrong but i put to mirror the conditions if the seedlings were outside as temperate fluctuates in night and day?

Reply 18

oscarrrrrrrrrr

4

Original post

by treestumpcheetah

i think this is wrong but i put to mirror the conditions if the seedlings were outside as temperate fluctuates in night and day?

Yh im not rlly sure I said that aswell, I think there'll be lots of options on the mark scheme, I just hope i included a couple of them

Reply 19

Shush1412

6

Original post

by hdjdhdj

what did everyone put for the:
-surface area of leaf
-differences between selective breeding and genetic modification
-why biological pesticides is better than normal or smth

i put use squared paper and estimate number of 1cm^2 covered by leaf. I also put the GM produces plants faster and that in GM, genetic variation occurs by inserting another gene but in selective breeding, genetic variation occurs from the random fertilisation of gametes. I put that biological control is better because: insects do not become resistant unlike pesticides, does not need to be reapplied and does not result in bioaccumulation

Edexcel IGCSE Biology (Modular) Unit 1 - 13th May 2025 [Exam Chat]

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