HORTICULTURE

Detailed explanation-1: -Algae are morphologically simple, chlorophyll-containing organisms that range from microscopic and unicellular (single-celled) to very large and multicellular.

Detailed explanation-2: -Some algae, the diatoms, are single-cell ed. Others, such as seaweed, are multicellular (see Figure below). Diatoms are single-celled algae. Other forms of algae are multicellular.

Detailed explanation-3: -Algae are defined as a group of predominantly aquatic, photosynthetic, and nucleus-bearing organisms that lack the true roots, stems, leaves, and specialized multicellular reproductive structures of plants.

Detailed explanation-4: -There are single celled flagellated species like Chlamydomonas, and some green algae species can form spherical colonies, like in Volvox. Other multicellular lineages of green algae, like Trentepohlia, even became terrestrial, independently of the land plants, sometimes forming symbiotic lichens.