Differential thickening in the guard cells is absent in case of

Options :
  1. apple
  2. Azolla
  3. maize
  4. sunflower
Answer and Explanation :-

Answer: Option 2

Explanation:

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We are such spendthrifts with our lives, the trick of living is to slip on and off the planet with the least fuss you can muster. I'm not running for sainthood. I just happen to think that in life we need to be a little like the farmer, who puts back into the soil what he takes out.
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