All the organism included in Protista are unicellular (acellular) eukaryotes. Members of protista are primarly
aquatic. This kingdom forms a link with the others dealing with plants. animals and fungi.
Living organisms included in Protista are as follow :
[ Dinoflagellates, Chrysophytes, Euglenoids , Slime molds, Protozoans ]

Reproduction :- Protists reproduce Asexually and Sexually.

1. Asexual Reproduction :
This is the most common method of reproduction in protists. It is of following types-
(a) Binary Fission : Two daughter cells are formed by the division of one mother cell. After this each daughter cell grows to form a normal organism.
eg- Dinoflagellates, Chrysophytes, Euglenoids.

(b) Spore formation : Some protists have special structure known as sporangia. Spores are formed in this
sporangia. The sporangia bursts after sometime and all the spores become free. These spores form a new cell after generation.
eg- Slime moulds.

2. Sexual reproduction : Sexual reproduction was first of all seen in ptotists. In sexual reproduction two haploid gametes fused to form a diploid zygote. This process is known as Syngamy.
Syngamy is of three types -

(a) Isogamy : It is the easiest way of sexual reproduction. In isogamy the fusing gametes are morphologically (i.e. shape, size, structure) similar but physiologically (i.e. functionally or genetically) they may be similar or dissimilar, when fusing gametes are physiologically dissimilar process is called physiological anisogamy.

(b) Anisogamy : The fusing gametes are morphologically dissimilar (smaller - larger) but physiologically they may be similar or dissimilar (usually).

(c) Oogamy : It is the developed form of anisogamy. Male gamete is small and motile while female gamete is large and non-motile. This female gamete is known as egg. In it the formation of male & female gametes takes place in sex organs.