Explain the benefits of using ethene gas to control ripening
• Ensures that the fruits ripen uniformly.
• Reduces the likelihood of spoilage during transportation and storage.
• Helps the fruits be in an ideal state for consumption.
What does the plant hormone ABA do?
Triggers stomatal closure
What are the commercial uses of auxins for root growth?
• Rooting powders that contain auxins stimulate root cell development when they are applied to plant cuttings, increasing the success rate of plant propagation.
• Auxins are essential in micropropagation to mass produce genetically identical plants from tissue samples, ensuring consistency and quality in crops.
How does synthetic auxins act as weedkillers?
- When weeds absorb synthetic auxins, they experience an accelerated and unsustainable growth rate.
- This leads to their death.
- This selective action is beneficial as it doesn’t harm nearby narrow-leaf crops.
- This allows those plants to thrive without competition from weeds.
What are the advantages of using synthetic auxins as weedkillers?
• Simple and cheap to produce.
• Low toxicity to mammals.
• Selective, affecting only broad-leaf plants.
Describe the role of plant hormones in the control of seed germination.
• Water is absorbed and activates embryo.
• Embryo releases gibberellin.
• Production of digestive enzymes
• break down food.
• Glucose used in respiration.
