Tutopiya: Study Resources for IGCSE, IB, GCSE & A-Levels

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.