Question

Which of the following is neither natural nor synthetic phytohormone?

• A. $ABA$
• B. Zeatin
• C. $2.4-D$
• D. None of the above
  

Answer 1

Answer: (D)

None of the above

• Abscisic acid is a natural phytohormone as it is obtained from the roots of a plant and from terminal buds.
  
• Zeatin is a cytokine derived from adenine. It was discovered in immature corn kernels.
• 2,4 Dichlorophenoxyacetic acid (2,4 D) is a synthetic auxin.

So, the correct answer is 'None of the above'.