Algal forms and size are usually small including microscopic forms to filamentous forms (Spirogyra) and colonial forms (Volvox).Kelp is a marine algae that exists as a massive plant body that is visible through the naked eyes.

They are brown algae of 100 meter height.so they can form massive bodies..

Meaning of the sentence:
The sentence means that kelps, which are a type of seaweed, have the ability to form a massive plant body. This indicates that kelps have a unique growth pattern in which they can develop extensive and large structures.

Explanation:
Kelps are large brown algae that belong to the order Laminariales. They are commonly found in cool coastal waters and are known for their impressive size and complexity. The sentence highlights the remarkable growth potential of kelps, emphasizing their ability to form massive plant bodies.

Kelps:
Kelps are a type of seaweed that primarily inhabit marine environments. They are characterized by their brown color, which is due to the presence of pigments such as fucoxanthin. Kelps have a complex structure consisting of a holdfast, stipe, and fronds.

Massive Plant Body Formation:
The phrase "massive plant body" refers to the extensive growth and development of kelps. Kelps have the ability to grow vertically and horizontally, forming dense underwater forests. They can reach extraordinary lengths, with some species exceeding 100 feet (30 meters) in height.

Growth Pattern:
Kelps exhibit a unique growth pattern that allows them to form their massive plant bodies. They have a holdfast, which functions as an anchor, attaching them to rocks or other substrates on the seafloor. From the holdfast, a long stipe grows vertically, acting as a stem.

Fronds:
At the top of the stipe, kelps produce large and leaf-like structures called fronds. These fronds are where photosynthesis occurs and are responsible for the kelp's growth and reproduction. Fronds can be several feet long and have a characteristic shape that resembles a broad ribbon or feather.

Importance:
The ability of kelps to form massive plant bodies is of ecological significance. Kelp forests provide essential habitats for numerous marine organisms, serving as nurseries, feeding grounds, and shelter. They support a high diversity of species, including fish, invertebrates, and other algae. Additionally, kelp forests contribute to the overall health and productivity of marine ecosystems by providing oxygen and capturing carbon dioxide.

In conclusion, the sentence highlights the exceptional growth potential of kelps, emphasizing their ability to form extensive and impressive plant bodies. This unique characteristic plays a vital role in supporting marine life and maintaining the balance of coastal ecosystems.