Algae | Definition, Characteristics, Classification, Examples, & Facts ...
2024年10月28日 · algae, members of a group of predominantly aquatic photosynthetic organisms of the kingdom Protista. Algae have many types of life cycles, and they range in size from microscopic Micromonas species to giant kelps that reach 60 metres (200 feet) in length.
Protist | Definition, Characteristics, Reproduction, Examples,
2024年10月11日 · With rare exception, authorities of the time classified such microscopic forms as minute plants (called algae) and minute animals (called “first animals,” or protozoa).
Algae - Phycology, Photosynthesis, Taxonomy | Britannica
2024年10月28日 · Using cladistic analysis (a method for determining evolutionary relationships), the green algae should be grouped with the land plants, the chromophyte algae should be grouped with the aquatic fungi and certain protozoa, and the Euglenophyceae are most closely related to the trypanosome flagellates, including the protozoa that cause sleeping ...
Blue-green algae | Microorganisms, Photosynthesis & Ecology
2024年11月12日 · blue-green algae, any of a large, heterogeneous group of prokaryotic, principally photosynthetic organisms. Cyanobacteria resemble the eukaryotic algae in many ways, including morphological characteristics and ecological niches, and were at …
protist summary | Britannica
Algae, members of a group of predominantly aquatic photosynthetic organisms of the kingdom Protista. Algae have many types of life cycles, and they range in size from microscopic Micromonas species to giant kelps that reach 60 metres (200 feet) in length.
Protist - Diversity, Unicellular, Microscopic | Britannica
2024年10月11日 · Protists cannot be divided perfectly into algae, protozoa, and fungi. As a result, the protists are spread across the major conventional algal and fungal classifications (in kingdom systems) and the eukaryotes generally (in the three-domain system).
Red algae | Marine, Seaweed, Rhodophyta | Britannica
algae, members of a group of predominantly aquatic photosynthetic organisms of the kingdom Protista. Algae have many types of life cycles, and they range in size from microscopic Micromonas species to giant kelps that reach 60 metres (200 feet) in length.
Fungi, Protists & Viruses Portal | Britannica
Algae, members of a group of predominantly aquatic photosynthetic organisms of the kingdom Protista. Algae have many types of life cycles, and they range in size from microscopic Micromonas species to...
Protist - Evolution, Fossils, Eukaryotes | Britannica
2024年10月11日 · The radiolarians and various green algal protists also have origins in the late Precambrian (1.2 billion to 1.3 billion years ago). Foraminiferans, dinoflagellates, haptophytes, and some brown algae (phaeophytes) date to the middle of the Paleozoic Era (some 300 million to 400 million years ago).
Protist - Nutrition, Respiration, Metabolism | Britannica
2024年10月11日 · At the cellular level, the metabolic pathways known for protists are essentially no different from those found among cells and tissues of other eukaryotes. Thus, the plastids of algal protists function like the chloroplasts of plants with respect to photosynthesis, and, when present, the mitochondria function as the site where molecules are ...