Question

One hormone stimulates the closure of stomata and another one influences the swelling of the axis in dicot plants. They are

• A. Gibberellins and ethylene
• B. Abscisic acid and cytokinins
• C. Gibberellins and cytokinins
• D. Auxins and cytokinins
• E. Abscisic acid and ethylene

Answer 1

The correct option is E Abscisic acid and ethylene

Abscisic acid is a plant hormone. It is also called as a stress hormone. During adverse environmental conditions, it's concentration increases. During water stress condition, it stimulates closure of stomata and hence decreases transpiration rate. Ethylene is also a plant hormone. It shows the triple response. It influences the horizontal growth of seedlings, swelling of the axis and apical hook formation in dicot plants.

Thus, the correct answer is option E.