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प्रश्न
What is the exact difference between grades of organization and symmetry? Explain with examples.
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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संबंधित प्रश्न
If you are given a specimen, what are the steps that you would follow to classify it?
How useful is the study of the nature of body cavity and coelom in the classification of animals?
The following characteristics are essential for classification.
The largest division of the living world is ______.
Species is the ______ unit of classification.
Which of the following animals has a true coelom?
In Pheretima locomotion occurs with the help of ______.
Which of the following is a crustacean?
Match the following columns and select the correct option.
| Column – I | Column – II | ||
| (p) | Pila | (i) | Devil fish |
| (q) | Dentalium | (ii) | Chiton |
| (r) | Chaetopleura | (iii) | Apple snail |
| (s) | Octopus | (iv) | Tusk shell |
Observe the animal below and answer the following questions.
- Identify the animal.
- What type of symmetry does this animal exhibit?
- Is this animal Cephalized?
- How many germ layers does this animal have?
- How many openings does this animal’s digestive system have?
- Does this animal have neurons?
______ was a greek philosopher who classified animals.
______ is a fluid-filled body cavity.
Which organism is called Friends of farmers? Why?
In which of the following the notochord is present only in embryonic stages?
Match the following list of animals with their level of organisation.
| Division of Labour | Animal |
| Column I | Column II |
| A. Organ level | i. Pheretima |
| B. Cellular aggregate level | ii. Fasciola |
| C. Tissue level | ii. Spongilla |
| D. Organ system level | iv. Obelia |
Choose the correct match showing division of labour with animal example.
Body cavity is the cavity present between body wall and gut wall. In some animals the body cavity is not lined by mesoderm. Such animals are called ______.
Which group of chordates possess sucking and circular mouth without jaws?
Differentiate between open circulatory system and closed circulatory system
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Animal with bilateral symmetry in ______.
