Aplant has a genetic defect that causes its leaves to dry out, becoming brittle and prone to injuries. the genetic defect most likely causes each leaf to lack a

The genetic defect most likely causes each leaf to lack a sufficient root system that can support the plant's growth.

The root system of plants contains networks of roots and their branches which functions by absorbing and transporting water and dissolved minerals from the soil to the plant in order to support the growth of the plant. They anchor (hold) the plant in the soil and also store reserve foods that can be used later by plants. Absence of sufficient root system in plants will affect the plants normal processes (including photosynthesis). The plant’s water absorbing capacity will be greatly reduced and this will make the plant to become dry (weak) and to be susceptible to insect and diseases.