Plants are living things that can sense things around them, just like animals and humans. One of the things they can sense is the number of things they are touching or growing near.
Plants have special cells called "mechanoreceptors" that can sense pressure and movement. So when a plant is touching or growing near other things, these cells can sense how many things there are and where they are located.
For example, if a plant is growing near other plants, it can sense when they are getting too close and may start to compete for resources like sunlight or water. The plant may respond by growing taller or wider to try to get more of these resources.
Plants can also use their number sense to help them reproduce. Some plants produce flowers with a certain number of petals, and bees and other insects are attracted to these flowers because they are easy to recognize. By having a certain number of petals, the plant is able to attract more pollinators, which increases its chances of reproducing.
Overall, number sense is just one of the many sensory abilities that plants have to help them survive and thrive in their environments.