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 123 of 137 · choose a topic above to narrow them down

SA-OB-TP-0041 markL2 StandardCalculatorAuxin

In a shoot lit from one side, auxin collects on the

Salam Academy Original Practice · Proposed mark scheme

SA-OB-TP-0051 markL2 StandardCalculatorAuxin

Auxin causes shoot cells to

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SA-OB-TR-0031 markL2 StandardCalculatorFactors and potometers

Wind increases transpiration because it

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SA-OB-TR-0041 markL2 StandardCalculatorTranspiration

Water moves up the xylem as a continuous column because water molecules

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SA-OB-TR-0052 marksL2 StandardCalculatorFactors and potometers

A potometer bubble moves

45

mm in

5

minutes. Calculate the rate in mm per minute.

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SA-OB-VA-0031 markL2 StandardCalculatorVariation

The rate of mutation is increased by

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SA-OB-VA-0041 markL2 StandardCalculatorSelection

In natural selection, individuals that survive are those

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SA-OB-VA-0051 markL2 StandardCalculatorSelection

Selective breeding differs from natural selection because

Salam Academy Original Practice · Proposed mark scheme

SA-OB-XP-0031 markL2 StandardCalculatorXylem and phloem

Xylem walls are strengthened with

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SA-OB-XP-0041 markL2 StandardCalculatorWater uptake

Water enters root hair cells by

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SA-OB-XP-0051 markL2 StandardCalculatorWater uptake

Root hair cells are adapted by having

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SA-OC-AB-0051 markL2 StandardCalculatorProton transfer

An acid is best defined as

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SA-OC-AI-0031 markL2 StandardCalculatorPollutants

Carbon monoxide is toxic because it

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SA-OC-AI-0041 markL2 StandardCalculatorPollutants

Which pollutant is the main cause of acid rain from coal-fired power stations?

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SA-OC-AI-0051 markL2 StandardCalculatorPollutants

Oxides of nitrogen are formed in car engines because

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SA-OC-AK-0031 markL2 StandardCalculatorCracking

Cracking requires

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SA-OC-AK-0041 markL2 StandardCalculatorCracking

\mathrm{C_{10}H_{22}\rightarrow C_8H_{18}+C_xH_4}

. Find

x

Salam Academy Original Practice · Proposed mark scheme

SA-OC-AK-0052 marksL2 StandardCalculatorCracking

\mathrm{C_{14}H_{30}\rightarrow C_{10}H_{22}+2C_2H_y}

. Find

y

Salam Academy Original Practice · Proposed mark scheme

SA-OC-AL-0021 markL2 StandardCalculatorMaking ethanol

Fermentation is carried out at about

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SA-OC-AL-0031 markL2 StandardCalculatorMaking ethanol

An advantage of making ethanol by hydration of ethene is that

Salam Academy Original Practice · Proposed mark scheme