Lysosomes are not visible in a plant cell under a light microscope. This is because they lack a distinct color and are usually too small to be distinguished individually.

Here's why:

* Lysosomes are colorless: They do not contain pigments that give them a specific color.

* Lysosomes are small: They are typically around 0.1-1.2 micrometers in diameter, making them difficult to see without specialized techniques like electron microscopy.

* Plant cells have other structures: Plant cells have a variety of other organelles and structures, such as chloroplasts, vacuoles, and cell walls, which can make it difficult to distinguish lysosomes.

Therefore, while lysosomes are present in plant cells, they are not visible as a distinct color under a light microscope.