Which one of the following is $NOT$ a disadvantage of self-pollination?

  • A
    No scope for developing improved varieties
  • B
    Progeny becomes weaker
  • C
    Genetic stability can be maintained
  • D
    Less adaptability to climatic variations

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$I$. Pollen grains of many species cause severe allergies and bronchial afflictions in some people, often leading to chronic respiratory disorders.
$II$. Pollen grains are rich in nutrients.
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