Question

Which of the following is NOT mentioned as a factor promoting pollen tube growth?

Options

• Gibberellic acid

• Sucrose and carbohydrates

• Boron

• Calcium

Answer 1

The material specifies five factors that promote pollen tube growth: sucrose/carbohydrates, boron, calcium, enzymes (pectinase and cellulase), and temperature. Gibberellic acid, while known to influence plant growth in general, is not explicitly mentioned as a factor promoting pollen tube growth in this context.