Infection and ResponseAQA GCSE Biology (8461)

Plant Disease

Work through the notes, try the practice questions, then take the quiz. The report tells you exactly what to revise next. (2026)

Practice progress

5 MCQs

0 of 5 attempted

Correct

Incorrect

Remaining

1
Which plant disease produces a mosaic pattern of light and dark green patches on leaves?
Answer & explanation
Correct: option B
TMV produces the distinctive mosaic discolouration. Rose black spot makes purple-black spots; magnesium deficiency makes uniform yellowing.
2
Rose black spot is caused by which type of organism?
Answer & explanation
Correct: option C
Rose black spot is a fungal disease, treated with fungicides and by removing affected leaves.
3
A plant has yellow leaves but is normal height. Which deficiency is most likely?
Answer & explanation
Correct: option B
Magnesium is needed to make chlorophyll. Deficiency causes yellow leaves (chlorosis). Nitrate deficiency would stunt growth instead.
4
Aphids damage plants by:
Answer & explanation
Correct: option B
Aphids are sap-sucking insects that pierce phloem and remove the sugars/amino acids the plant has just transported there.
5
Which of the following is NOT a method used to identify plant diseases?
Answer & explanation
Correct: option D
Plants don't maintain body temperature like mammals — temperature is not a diagnostic tool. AQA lists manuals, lab testing and monoclonal antibody kits as the three methods.

Infection and ResponseAQA GCSE Biology (8461)

Work through the notes, try the practice questions, then take the quiz. The report tells you exactly what to revise next. (2026)

5 MCQs

0 of 5 attempted

Correct

Incorrect

Remaining

1
Which plant disease produces a mosaic pattern of light and dark green patches on leaves?
Answer & explanation
Correct: option B
TMV produces the distinctive mosaic discolouration. Rose black spot makes purple-black spots; magnesium deficiency makes uniform yellowing.
2
Rose black spot is caused by which type of organism?
Answer & explanation
Correct: option C
Rose black spot is a fungal disease, treated with fungicides and by removing affected leaves.
3
A plant has yellow leaves but is normal height. Which deficiency is most likely?
Answer & explanation
Correct: option B
Magnesium is needed to make chlorophyll. Deficiency causes yellow leaves (chlorosis). Nitrate deficiency would stunt growth instead.
4
Aphids damage plants by:
Answer & explanation
Correct: option B
Aphids are sap-sucking insects that pierce phloem and remove the sugars/amino acids the plant has just transported there.
5
Which of the following is NOT a method used to identify plant diseases?
Answer & explanation
Correct: option D
Plants don't maintain body temperature like mammals — temperature is not a diagnostic tool. AQA lists manuals, lab testing and monoclonal antibody kits as the three methods.