Six Biology challenges

GCSE Biology

“Smoking causes disease” sounds scientific — but the table cannot prove that.

2 marks

Researchers compared the risk of four cardiovascular diseases in smokers with the risk in people who had never smoked. The increases were 12%, 24%, 37% and 65%. Give two conclusions supported by these data.

Can you give three genuine cell differences?

Which controls make a reaction-time test fair?

Why does photosynthesis stop at 45 °C?

What colour proves protein is present?

Which step activates Benedict’s test?

Can you put IVF in the right place?

What gives a vaccine its memory?

What makes homeostasis a control process?

Can you read a recessive inheritance cross?

What can clear zones really tell you?

When has pulse rate nearly recovered?

Are these differences or shared features?

Have you counted one DNA point twice?

Which variables are still uncontrolled?

What else must stay the same?

Why does catalase slow after overheating?

What changes when amylase gets too hot?

Which colour is a positive starch result?

What makes an emulsion test positive?

Have you heated the Benedict’s mixture?

Is the Benedict’s test in the right order?

Where does IVF fertilisation happen?

Which IVF stage comes after fertilisation?

What keeps vaccine protection ready?

Why can a booster response be faster?

Who detects and corrects overheating?

How does insulin close the control loop?

Does carrying the allele mean affected?

Which offspring show the recessive colour?

Which cell boundary gives celery its strength?

Which tissue keeps a rare orchid growing?

Which way does the colouring spread overall?

What powers nitrate uptake against the gradient?

Why is the left ventricle wall thicker?

Can one hospital ward represent a town?

Does a rising disease rate prove its cause?

Where does malignant spread begin?

Is the mosquito the pathogen or the carrier?

Which white-blood-cell defence fits the evidence?

How can vaccinated neighbours change someone else's risk?

Can a lower pain score prove the virus is gone?

Why must an antibody batch begin with one clone?

Where should an antibody carry its attached drug?

Can a leaf spot identify its own cause?

What makes a curling leaf defensive?

How does a cough carry measles between pupils?

What completes the Salmonella chain from hands to symptoms?

Why does glucose remain outside insulin-resistant cells?

What happens before urea reaches the kidneys?

Can hormone data separate maturation from ovulation?

What does a diaphragm actually stop?

Can auxin use change more than the crop?

Do beetles change because they need to?

Who becomes resistant: the patient or the bacteria?

Which orchid came from gamete fusion?

Why does one polydactyly allele affect the child?

Can XX and XY identify two newborn samples?

Can two biotic changes explain one moth decline?

How do broad feet keep a snowshoe hare moving?

How does a grazer return carbon to plants?

Which warming effect counts as a biological consequence?

Can wider net openings protect future breeders?

How does an Arctic fox survive a frozen winter?