People often say that "man struggles upwards, and water flows downwards", but there are countless examples of water flowing upwards. We can't regard the upward flow of water as nonsense against science.

Which direction the water flows depends on the direction in which the water is forced. It is common that the water on the ground is influenced by the gravity of the earth, so it will flow downwards. However, if the force acting on water is upward besides downward gravity, and the resultant force of these two forces is upward, then water will flow in the direction of resultant force.

For example, the water in the pump can flow upward; At high tide, the attraction of the moon to seawater makes the seawater rush to the shore; When you insert the straw into the water, you can see that the water rises to a certain height from the straw. The thinner the straw, the more water rises. Here we specifically talk about the phenomenon of water rising in the capillary, that is, capillary phenomenon. The force that makes water rise in the thin tube is generated by the meniscus on the liquid surface in the thin tube. Plants can send water from roots to leaves of several meters or even tens of meters, relying on countless extremely thin tubes in plant leaves.

In order to prove that plants can absorb water upwards, please do the following experiment: insert the flower branches of a herb into a bottle mixed with blue ink, and the original flowers will turn blue after a while, indicating that the blue ink rises to the flower part along the mosaic.