Practise

Question bank

Original exam-style questions, mapped to your syllabus. Answers are checked for mathematical equivalence and every attempt updates your mastery.

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2730 questions · page 120 of 137 · choose a topic above to narrow them down

SA-OB-EX-0041 markL2 StandardCalculatorKidney function

Which substance is filtered but completely reabsorbed in a healthy kidney?

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SA-OB-EX-0051 markL2 StandardCalculatorKidney function

Urine travels from the kidneys to the bladder in the

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SA-OB-FC-0031 markL2 StandardCalculatorFood webs

In grass → rabbit → fox, the fox is the

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SA-OB-FC-0042 marksL2 StandardCalculatorEnergy transfer

Plants contain

50\,000

kJ; herbivores receive

4000

kJ. Calculate the efficiency of transfer.

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SA-OB-FC-0052 marksL2 StandardCalculatorEnergy transfer

A trophic level has

3000

kJ. With

10\%

efficiency, how much energy reaches the next level?

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SA-OB-FP-0021 markL2 StandardCalculatorCrop production

Burning paraffin in a greenhouse increases yield because it releases

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SA-OB-FP-0031 markL2 StandardCalculatorCrop production

Biological control of pests means

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SA-OB-FP-0041 markL2 StandardCalculatorCrop production

A disadvantage of pesticides is that they

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SA-OB-FP-0051 markL2 StandardCalculatorAnimal farming

A problem with fish farming is

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SA-OB-GE-0021 markL2 StandardCalculatorBreathing

When breathing in, the diaphragm

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SA-OB-GE-0031 markL2 StandardCalculatorBreathing

Air enters the lungs because

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SA-OB-GE-0041 markL2 StandardCalculatorLungs

Alveoli are efficient because they have

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SA-OB-GE-0051 markL2 StandardCalculatorLungs

Compared with inspired air, expired air contains

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SA-OB-GM-0031 markL2 StandardCalculatorGM process

A plasmid is used in GM as a

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SA-OB-GM-0041 markL2 StandardCalculatorGM process

Sticky ends are

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SA-OB-GM-0051 markL2 StandardCalculatorGM uses

Human insulin for diabetics is now mainly produced by

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SA-OB-HI-0021 markL2 StandardCalculatorPollution

In eutrophication, fish die mainly because

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SA-OB-HI-0031 markL2 StandardCalculatorHabitat loss

Deforestation increases atmospheric CO₂ because

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SA-OB-HI-0041 markL2 StandardCalculatorHabitat loss

A consequence of deforestation is

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SA-OB-HI-0051 markL2 StandardCalculatorPollution

Non-biodegradable plastics are harmful because they

Salam Academy Original Practice · Proposed mark scheme