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Question

The loss or reduction of chlorophyll in the leaves is due to:

A
bleaching by chlorine
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B
reduction by chloroflurocarbons
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C
bleaching by sulphur dioxide
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D
oxidation by NO2
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Solution

The correct option is C bleaching by sulphur dioxide

Chlorosis is typically caused when leaves do not have enough nutrients to synthesise all the chlorophyll they need. It can be brought about by a combination of factors including:

  • a specific mineral deficiency in the soil, such as iron or magnesium
  • deficient nitrogen and/or protein
  • poor drainage (waterlogged roots)
  • damaged and/or compacted roots
  • exposure to sulphur dioxide
  • ozone injury to sensitive plants

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