Which one of these is not know?

Which one of the following growth regulators is know as strees hormone ?

Which one of the following plant hormone (phytohormone) is know as a stress hormone?

Which one o f the following plant hormone (phytomone ) Is know as a stress hormone

Which one o f the following plant hormone (phytomone ) Is know as a stress hormone

Which one is used for knowing weather or not a populationis evolving?

Which one of the following figures represents the statement: All the persons know English Few of them know Hindi also .Those who know hindi know bengali.

Which of the following is knows as silicone ?

Which of the following is know as anhydron ?