Question

The phytohormone which is a derivative of carotenoids performs all of the following functions in a plant, except:

• A. Closing of stomata during water stress condition
• B. Decreasing sensitivity of roots to gravity
• C. Stimulation of senescence in leaves
• D. Abscission of flowers and fruits

Answer 1

The correct option is B Decreasing sensitivity of roots to gravity

The phytohormone abscisic acid is a derivative of carotenoids. This PGR is also called stress hormone. It inhibits the protein and RNA synthesis and causes destruction of chlorophyll.
Ethylene decreases sensitivity of roots to gravity.