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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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संबंधित प्रश्न
If you are given a specimen, what are the steps that you would follow to classify it?
What are the reasons that you can think of for the arthropods to constitute the largest group of the animal kingdom?
Write in brief about progressive changes in animal classification.
Complete the following chart.
| Body cavity | Germ Layer | Phylum |
| Absent | ______ | Porifera |
| Absent | Triploblastic | ______ |
| Pseudocoelom | ______ | Aschelminthes |
| Present | ______ | Arthropoda |
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 have the highest number of species in nature?
Lateral line sense organs occur in ______.
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 |
Identify the structure that the archenteron becomes in a developing animal.
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?
In some animal groups, the body is found divided into compartments with serial repitition of at least some organs. This characteristic feature is called ______.
Provide appropriate technical term in the space provided.
Blood-filled cavity in arthropods ______.
Differentiate between open circulatory system and closed circulatory system
Animal with bilateral symmetry in ______.
