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AQA GCSE BIOLOGY PAPER 2 HIGHER TIER - JUNE 2022 ( QUESTIONS AND CORRECT MARK SCHEME ANSWERS)

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AQA GCSE BIOLOGY PAPER 2 HIGHER TIER - JUNE 2022 ( QUESTIONS AND CORRECT MARK SCHEME ANSWERS)

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AQA GCSE BIOLOGY PAPER 2
HIGHER TIER - JUNE 2022
( QUESTIONS AND CORRECT MARK
SCHEME ANSWERS)



Complete20table20120to20compare20sexual20reproduction20with20asexual20reproduction.
Write20a20tick20in20the20box20if20the20statement20is20true.
The20first20row20has20been20completed20for20you.20-20ans-Sexual20reproduction
-cell20division20occurs
-fertilisation20occurs

asexual20reproduction
-cell20division20occurs
-genes20are20passed20on20from20parent20to20offspring
-offspring20are20genetically20identical20to20each20other

Students20investigated20the20population20of20earthworms20in20the20soil20in20two20different20ar
eas.
-Area20A:20a20grass20lawn
-Area20B:20a20farmer's20field

Chemical20X20can20be20mixed20with20water20and20poured20onto20the20soil.
The20mixture20beings20earthworms20to20the20surface20of20the20soil20but20does20not20harm20the
20earthworms.



Plan20an20investigation20using20chemical20X20to20compare20the20number20of20earthworms20p
er20m^220in20areas20A20and20B.20-20ans--
Same20concentration20of20chemical20applied20to20the20soil
-Same20volume20of20chemical20applied20to20the20soil
-Same20size20of20area20sampled20e.g.201m^220or200.25m^2
-Use20of20quadrat
-Same20time20between20application20and20collecting20worms
-Same20time20allowed20for20collecting20worm20after20application
-Each20sample20area20selected20randomly
-Method20achieving20randomness20e.g.20random20coordinates
-Count20worms20in20each20of20the20areas20A20and20B
-At20least20520repeats20in20each20of20the20areas20A20and20B

, -Calculate20mean
-Compare20means

Explain20the20effect20of20a20high20concentration20of20insulin20has20on20blood20glucose20conce
ntration.20-20ans-Effect:20lowered
Explanation:20Glucose20is20taken20in20by20cells

Table20220shows:20
-the20results20of20the20blood20test
-the20mean20results20for20people20who20do20not20have20diabetes

Type20220diabetes20occurs20when20body20cells20have20a20reduced20response20to20insulin.
Give20two20ways20the20results20of20the20blood20test20show20that20person20C20might20have20Typ
e20220diabetes.20-20ans-high20concentration20of20insulin
high20glucose

Give20two20ways20that20a20person20can20reduce20the20chance20of20developing20type20220diabe
tes20-20ans-more20exercise
eat20a20low20carbohydrate20diet

Name20three20harmful20substances20that20could20cause20water20pollution
Do20not20refer20to20plastic20or20to20litter20in20your20answer20-20ans-Fertiliser
Sewage
herbicide

Describe20how20substances20that20pollute20air20and20water20could20be20harmful20to20humans2
0and20other20living20organisms20-20ans-Air20pollution

-20Sulfur20dioxide20causes20damage20to20leaves20so20less20photosynthesis20take20place.
-damage20to20roots20or20alters20ions20in20soil20so20less20protein20is20made.
-20damage20to20lungs20which20can20lead20to20breathing20difficulties.

-Carbon20monoxide20combines20with20haemoglobin20so20less20oxygen20is20carried.
-
Particulates20blocks20light20leading20to20less20photosynthesis20taking20place20and20less20gluc
ose20being20made
-20damage20to20lungs20can20cause20asthma

Water20pollution
-Sewage20causes20bacteria20to20multiply20and20use20oxygen20for20respiration.
-water20animals20cannot20respire20
-pathogens20in20water

-fertiliser20causes20algae20to20multiply
-algae20block20light20so20plants20cannot20photosynthesise
-20lack20of20oxygen20for20respiration20so20fish20die

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