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प्रश्न
What is the exact difference between grades of organization and symmetry? Explain with examples.
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उत्तर
Difference Between Grades of Organization and Symmetry are:
- Grades of Organization describes the way an organism's cells are arranged structurally:
- Cellular Level: Cells that are loosely organized (like Porifera).
- Tissue Level: Coelenterata and other similar cells form tissues.
- Organ Level: Platyhelminthes are examples of tissues that form organs.
- Organ System Level: Nematoda and Annelida are examples of organ systems.
- Symmetry describes how an organism's body can be separated into identical components.
- Asymmetry: Unable to be separated (sponges, for example).
- Radial Symmetry: Divided across several planes, radial symmetry (e.g., Hydra).
- Bilateral Symmetry: Split into two parts (humans, for example).
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