Protoctista Ppt

1. By Ali Paton

2. The kingdom Protoctista is defined by exclusion.
The members of this kingdom are neither
animals, plants, nor prokaryotes.
They comprise these eukaryotic microorganisms
and their immediate descendants:
all nucleated algae. (This includes sea-weeds)
Water moulds which have flagella
Slime moulds and slime nets
Protozoa

3. Characteristics of Protoctista
 It is a very diverse group with remarkable variation in cell organisation,
patterns of cell division and life cycle.
All algae are autotrophs as they are able to photosynthesise.
 the other forms are heterotrophic.
However some change between being autotrophic and heterotrophic according to
condition
most have mitochondria
They are all thought to have developed from symbiosis (living together of two
species to the advantage of both)
Protoctista can all be grouped together due to their organelle structure, e.g. the
form of the membranous structures (cristae) of the mitochondria.
In addition the differences in the pigments used for photosynthesis are used for
classification. 
Protoctista are aquatic.
They can make their habitat in salt water, freshwater, in moist soil, or within the
moist tissues of others.

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