1) The pollen of insect-pollinated plants is transferred from flower to flower by insects purposefully, it is large, there are not many of it.
2) Wind-pollinated plants form more pollen to increase the chance of it reaching small flowers.
3) Pollen is sometimes carried away by the wind, beaten by rain, and only a large amount of it contributes to fertilization.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.