Fig. 1 shows leaves from two tomato plants in a greenhouse. Plant A has pale mottled leaves and curled edges. Plant B is healthy. A grower suspects a viral ...
Question 1 Report
Fig. 1 shows leaves from two tomato plants in a greenhouse. Plant A has pale mottled leaves and curled edges. Plant B is healthy. A grower suspects a viral disease because the affected plant also has reduced growth. The grower removes Plant A and disinfects pruning tools before using them on Plant B. The grower does not give antibiotics because these chemicals are intended for some bacterial infections, not viral ones.
(a) Identify the pathogen group most likely to have caused the disease in Plant A. [1]
(b) Explain why removing Plant A can reduce infection of the other plants. [1]
(c) Which statement describes why antibiotics do not kill viruses? [2]
Answer Details
(a) Virus [1] (b) It removes a source of virus / reduces transfer of the pathogen to healthy plants. [1] (c) Viruses reproduce inside host cells [1]; antibiotics target bacterial cell processes / bacterial cells and do not target viruses. [1]
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