Algae exhibit which form growth

Explanation

The correct answer is 'All of these'. Algae are a diverse group of organisms that can exhibit various growth forms. They can be unicellular, as seen in species like Chlamydomonas. Filamentous forms are represented by algae such as Spirogyra, which grow in thread-like structures. Leaf-like extensions are seen in algae like Ulva, which resemble small leaves. Therefore, algae can exist in all these forms, depending on the species. Options A, B, and C are specific examples of these forms, but they do not encompass the diversity of algae as a whole.