Discussion
Which of the following is the effect of air pollution on leaves that causes the killing or collapse of tissues ?
Answer: A
The effect is Necrosis.
Necrosis is the death and collapse of plant tissue, seen as dead, often dark brown patches on leaves. Pollutants such as sulphur dioxide and ozone can kill leaf cells outright in this way.
Chlorosis is yellowing from loss of chlorophyll, without the tissue dying. Abscission is the shedding of leaves, and epinasty is the downward curling of leaves caused by faster growth on their upper side. None of these is the killing or collapse of tissue itself.
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