Practise Fungal diseases. 11 exam-style questions on this subtopic, at up to four difficulty levels, with full mark schemes and a progress tracker. Free, no account needed.
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Rose black spot is a disease of rose plants. Give one way that rose black spot is spread.
By water or wind.
Sample questions
Written for this site in the style of AQA exam questions. They are not taken from real past papers.
Question 1Easy6 marks
Rose black spot is a disease of rose plants.
(a) What type of pathogen causes rose black spot? Tick (✓) one box.[1]
Bacterium
Fungus
Protist
Virus
(b) Describe what the leaves of a rose plant with black spot look like.[2]
(c) Give one way that rose black spot is spread.[1]
(d) Give two ways that a gardener could treat rose black spot.[2]
Show the answer and mark scheme
(a)Answer: Fungus
(b)
purple / black spots on the leaves
leaves turn yellow (and drop off early)
(c)Answer: By water or wind.
(by) water / rain
(by) wind
(d)
spray with a fungicide
remove and destroy the affected leaves
Question 2Medium6 marks
A gardener noticed black spot on some rose bushes. Many of the leaves turned yellow and fell off early.
(a) Explain why rose bushes with black spot grow less than healthy rose bushes.[3]
(b) The gardener collected the fallen leaves from the ground and burned them. Explain why this helps to stop black spot spreading.[2]
(c) Suggest why black spot spreads more quickly in wet weather.[1]
Show the answer and mark scheme
(a)
fewer leaves / less green leaf area / less chlorophyll
(so) less photosynthesis
(so) less glucose for respiration / for making new cells / for growth
(b)
the fallen leaves contain the fungus / spores
burning destroys the fungus, so it cannot be spread (by wind or water) to healthy leaves / plants
(c)
the fungus / spores are spread by water, e.g. rain splashes spores onto other leaves
Question 3Hard5 marks
A gardener must dilute a fungicide concentrate with water before spraying rose bushes. The instructions say the diluted spray should contain 1 cm3 of concentrate for every 200 cm3 of diluted spray.
(a) Calculate the volume of concentrate needed to make 5 dm3 of diluted spray.[2]
(b) Calculate the volume of water needed to make up this 5 dm3 of spray.[1]
(c) Suggest why using a more concentrated mixture of fungicide than the instructions state could damage the rose plants.[2]
Show the answer and mark scheme
(a)Answer: 25 cm3
5 dm3 = 5000 cm3, and 5000 ÷ 200
25 (cm3)
(b)Answer: 4975 cm3
5000 − 25 = 4975 (cm3)
(c)
a highly concentrated fungicide is more likely to be toxic to the plant's own cells, not only to the fungus