Question

Cacti in the Arizona desert compete to draw water through the roots because it does not rain much there. Younger plants with smaller roots have a tough time competing with the larger roots of the older plants. As a result, some of the younger cacti will die. What is the limiting factor?
A: Size of the roots
B: Soil
C: Sunlight
D: Water

Answer 1

The answer is;  D

A limiting factor is a resource in the environment that significantly affects the growth, distribution or abundance of an organism or population within an ecosystem. When this factor is controlled it can result in increased or decreased growth.

In this water, the level of the water table in the desert limits the growth of the cacti plants.