Zinc is essential for

Options :
  1. biosynthesis of chlorophyll
  2. biosynthesis of 3 -IAA
  3. stomatal closing
  4. oxidation of carbohydrates
Answer and Explanation :-

Answer: Option 2

Explanation:

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I think, well, I've had a shit of a life, all things considered. It wasn't fair. Everyone I've ever loved is dead, and my leg hurts all the bloody time...but I think, any God that can do sunsets like that, a different one every night...'strewth, well, you've got to respect the old bastard, haven't you?
-Neil Gaiman The Sandman Vol. 4: Season of Mists