Horn like protuberances of guard cells called ridges are absent in some species of

Options :
  1. Nicotiana
  2. Solanum
  3. Dianthus
  4. Pinus
Answer and Explanation :-

Answer: Option 4

Explanation:

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...and we'll see what happens when we say Yes while this rigor mortis world screams No.
-Isaac Marion Warm Bodies