A) abscisic acid
B) alleopathins
C) phytochelatins
D) phytoalexins
Correct Answer: C
Solution :
Under chelating the micronutrient cations react with hydroxyl ions eventually precipitating insoluble hydrous metal oxides. Phytochelatins bind with heavy metal like cadmium Phytoalexins are phenolic compound which are not present in healthy plant but are produced upon stimulation of plants by a pathogen or by a mechanical or chemical injury. They include ipomeamerone, orchinol isocoumarin, pisatin and phaseolin. Abscissic acid is also called stress hormone because its production is stimulated by drought and other adverse environmental conditions.
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