Kingdom Protista

• Eukaryotic with solitary or colonial unicellular organization without any differentiation into tissues and organs.
• Mostly aquatic forms called planktons.
• Nutrition absorptive, photosynthetic, or ingestive. Photosynthetic pigments are chlorophylls present in plastids (chloroplasts).
• The protistan cells possess cell organelles such as mitochondria, Iysosomes, centrioles, and other membrane-bound organelles like endoplasmic reticulum, Golgi bodies, etc.
• The cellular organization is of two envelope type, i.e., besides plasma membrane, internal membranes occur around certain organelles.
• Genetic material is organized in the form of a true nucleus.
• Flagella, if present, are 11 stranded with 9 + 2 arrangement and are made up of a protein named tubulin.
• Reproduction is sexual and asexual