Question

which organisms are called primitive and how are they different from the so called advanced organisms

Answer 1

Prokaryotes are the primitive organisms.Difference -
First sentence is for Prokaryotes and second one for eukaryotes(the advanced organism)
1
Occurrence~
Prokaryotic cells are the characteristics of bacteria and blue green algae (cyanobacteria)
These are cells are found in all, animals and plants, except blue green algae and bacteria.
2
Size~
Mostly 1-10 μm
Mostly 10-100 μm
3
Multicellular forms~
Rare
Common, with extensive tissue formation
4
Cell wall~
Present in most but not in all cells. In Bacteria, cell wall is made up of murein, poly saccharides, lipids and proteins.
The animal cells lack cell wall, but plants cell wall is made up of cellulose and chitinous cell wall is present in fungi.
5
Plasma membrane~
Present
Present
6
Nucleus~
Absent. Nucleiod region is present where genetic material resides.
Present
7
Nuclear Membranes~
Absent
Present
8
Chromatin with histone~
Absent
Present
9
Number of chromosomes~
Each cell has only one chromosome.
Number of chromosomes per cell depends upon the type of organism.
10
Chromosome~
The chromosome is circular ring lacking a centromere.
Each chromosome is linear having a centromere with two kinetochores meant for attachment to the spindle fibres during cell division.

Hope it helps...!!!!

Answer 2

☆$\red {HELLO\:DEAR}$☆

A primitive organism or lower organism is the one which has a simple body structure and ancient body design or features that have not changed much over a period of time.

An advanced organism or higher organism has a complex body structure and organization.

For example, an Amoeba is more primitive as compared to a starfish. Amoeba has a simple body structure and primitive features as compared to a starfish.

Hence, an Amoeba is considered more primitive than a starfish.

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