AP BIOLOGY

Detailed explanation-1: -algae, singular alga, 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.

Detailed explanation-2: -Given below are some other catogories; Some general biology textbook authors place the microscopic, unicellular green algae (Division Chlorophyta) in the Kingdom Protista, and place the larger, multicellular (macroscopic) green algae (Division Chlorophyta) in the Kingdom Plantae.

Detailed explanation-3: -Algae are called living organisms. They possess chlorophyll that helps in photosynthesis. They are considered plant-like protists. They are simple organisms that lack complex plant organs such as roots, stems, and leaves.

Detailed explanation-4: -Algae are simple organisms with chlorophyll and thus are known as autotrophs as they produce their own food. They belong to kingdom Protista as eukaryotic cells with a proper nuclear organization and occur as unicellular or aggregated cellular structures.

Detailed explanation-5: -Kingdom protista includes unicellular eukaryotic organisms. Plant-like protists include diatoms, animal-like protists include protozoans like amoeba, euglena, paramecium, etc., while fungi like protists include slime molds.