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: any plant or plantlike organism (as a seaweed) that includes forms mostly growing in water, lacking a system of vessels for carrying fluids, and often having chlorophyll masked by brown or red coloring matter.

2025年3月13日 · 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. Their photosynthetic pigments are also more varied than those of plants, and their cells have features not found among plants and animals.

Algae (UK: / ˈælɡiː / AL-ghee, US: / ˈældʒiː / AL-jee; [3] sg.: alga / ˈælɡə / AL-gə) is an informal term for any organisms of a large and diverse group of photosynthetic eukaryotes, which include species from multiple distinct clades.

2024年9月11日 · Algae are primarily aquatic, photosynthetic organisms that are often simple in structure and range from unicellular microalgae, like diatoms, to multicellular forms, such as giant kelp.

2023年3月10日 · Algae are photosynthetic organisms that possess photosynthetic pigments such as chlorophyll. However, they lack true roots, stems, and leaves characteristic of vascular plants. Some of them are unicellular whereas others are multicellular. They may also form colonies. Most algae are aquatic.

2025年3月13日 · Algae are almost ubiquitous throughout the world and can be categorized ecologically by their habitats. Planktonic algae are microscopic and grow suspended in the water, whereas neustonic algae grow on the water surface and can be micro- or macroscopic.

“Alga is a term that describes a large and incredibly diverse group of eukaryotic, photosynthetic lifeforms. These organisms do not share a common ancestor and hence, are not related to each other (polyphyletic).” Multicellular examples of algae include the giant kelp and brown algae.

2025年3月13日 · Early morphological research using electron microscopes demonstrated differences in features, such as the flagellar apparatus, cell division process, and organelle structure and function, that have been important in the classification of algae.

Algae (singular alga) are a large and diverse group of photosynthetic, eukaryotic, plant-like organisms that use chlorophyll in capturing light energy, but lack characteristic plant structures such as leaves, roots, flowers, vascular tissue, and seeds.