Question

Study the following statements

1.It promotes abscission and senescence of plant organs

2.It stimulates flowering for synchronized fruit set in pineapple.

3.It induces apical hook formation in dicot seedlings

4.It enhances respiration rate during ripening of fruits

The above are the physiological effects of a

• A. Stress hormone, ABA
• B. Flowering hormone, Auxin
• C. Stem and Root elongation hormone, GA
• D. Fruit ripening hormone, Ethylene

Answer 1

The correct option is D Fruit ripening hormone, Ethylene

Ethylene is a simple gaseous PGR. It is synthesised in large amounts by tissues undergoing senescence and ripening fruits. Ethylene causes apical hook formation in dicot seedlings, promotes senescence and abscission of plant leaves and flowers, enhances respiratory rate during fruit ripening and initiate flowering and synchronous fruit set in pineapple.