AP BIOLOGY

Detailed explanation-1: -Water hyacinth has a special type of parenchyma tissue which is known as the aerenchyma. Aerenchyma is the spongy tissue that has air spaces or channels where the air is trapped, especially in the stem of the hyacinth. The stem part becomes buoyant and due to this, the water hyacinth floats on the surface of the water.

Detailed explanation-2: -Aerenchyma: Large air gaps exist in the parenchyma of aquatic plants to let them float on water. Such a parenchyma type is called aerenchyma.

Detailed explanation-3: -In many aquatic plants, parenchyma cells have large air cavities to give buoyancy to the plant and enable them to float in water. Such, parenchyma cells are called as aerenchyma. Water hyacinth possess such cells, which make them enable to float in water.

Detailed explanation-4: -Water hyacinth is a perennial, free-floating aquatic plant native to tropical regions of South America, and now present on all continents except Antarctica. Plants rapidly increase biomass and form dense mats, reproducing from stolons (i.e., vegetative runners).