What is the exact difference between grades of organization and symmetry Explain with examples

Explanation

1. Grades of organization depends upon the differences in the body structure of various organisms such as unicellular and multi-cellular.
2. Body symmetry is depending up on the similarities in the body parts getting after cutting through imaginary axis of the body.
3. Body organi zation of unicellular animals is referred to as .Protoplasmic grade. organization.
4. In multi-cellular animals, if tissues are not formed, their body organization is called as .cellular grade organization. Eg. Phylum - Porifera.
5. Some animals show .cell-tissue grade organization where cells form tissues and tissues perform all body functions. Eg. Phylum - Cnidaria.
6. Animals like flat worms show Tissue - Organs grade organization where tissues form organs and organs perform all the body function.
7. Animals like crab, human etc. show .Organ- system grade. organization where organs join to form organ systems and perform specific body functions.
8. Depending upon body symmetry, there are three different types of animal bodies: - (a) Asymmetrical body. (Eg. Amoeba) (b) Radial Symmetry. (Eg. Starfish) and (c) Bilateral Symmetry. (Eg. Insects, fishes)