The 'triple response' in seedlings (shortening of the axis, thickening of the axis, and horizontal growth) is a characteristic effect of:
Show answer and explanation
Correct answer: Ethylene
Ethylene induces a specific growth pattern in dicot seedlings known as the triple response. This includes inhibition of stem elongation, stimulation of radial swelling, and horizontal growth/apical hook formation.
Keep practicing
More Plant Growth Regulators questions
- Which synthetic auxin is widely used as a weedicide to kill broad-leaved dicotyledonous weeds?
- Bolting, the internode elongation just prior to flowering in rosette plants like beet and cabbage, is induced by:
- Kinetin, a modified form of adenine, was first discovered from:
- Which hormone is used to induce parthenocarpy (seedless fruit formation) in tomatoes?
- The respiratory climacteric, an increase in respiration rate during fruit ripening, is triggered by:
- Which hormone acts as a general plant growth inhibitor and antagonist to Gibberellins?