Here's why:

* Self-fertilization: True-breeding plants can reproduce by self-fertilization, meaning the pollen from the plant fertilizes its own ovules.

* Consistent traits: When these plants self-fertilize, the offspring consistently inherit the same genetic makeup, leading to offspring with the same traits as the parent plant.

In simpler terms: A true-breeding plant is like a "purebred" animal – it always passes on its traits to its offspring, generation after generation.

This concept is crucial in genetics and breeding, as it allows scientists to isolate and study specific traits.