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IMSO 2007 Taiwan Selection — Science First Round Question 25

IMSO Science · IMSO 2007 Taiwan Selection — Science First Round

Question 25

Stomata in the typical green leaves,
  1. are covered by a waxy cuticle
  2. control the opening of guard cells
  3. close when water is being lost at too great a rate
  4. are usually most abundant on the upper epidermis of a leaf