When strips of cobalt chloride paper are placed on either side of a dorsiventral leaf,why do the strips on the lower side become pink more speedily?

  • A
    More $CO_2$ is evolved from the lower side
  • B
    More $O_2$ is evolved from the lower side
  • C
    More $H_2O$ is lost from the lower side
  • D
    All the above

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