Which plant hormone is responsible for inhibiting growth and promoting dormancy during stressful conditions?

The correct answer is Abscisic acid.

Key Points

• Abscisic acid (ABA) is known as the stress hormone in plants.
• It plays a critical role in seed dormancy by preventing germination during unfavorable conditions.
• ABA helps in closing stomata to reduce water loss during drought stress.
• It also regulates various aspects of plant growth and development, including leaf senescence.

Additional Information

• Gibberellin: Gibberellins are a group of plant hormones that promote growth and influence various developmental processes, including stem elongation, germination, and flowering.
• Cytokinin: Cytokinins are a class of plant growth substances that promote cell division and growth, and influence pathways of nutrient transport.
• Auxin: Auxins are a class of plant hormones that play a key role in coordinating various growth and behavioral processes in the plant's life cycle, such as cell elongation and differentiation.