Discussion
Sulphur dioxide injury to leaves is characteristically
Answer: B
Correct answer: Interveinal necrosis
Sulphur dioxide dissolves in the moisture of the leaf and forms sulphite and then sulphuric acid, killing the mesophyll tissue between the veins while the veins themselves, better supplied, survive. The result is bleached or brown patches lying between green veins.
The contrast with ozone is diagnostic: ozone gives fine stippling on the upper surface, sulphur dioxide gives larger interveinal areas of dead tissue. Neither produces the root or stem symptoms offered as distractors, both being gases that enter through the stomata of the leaf.
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