Animal Classification
Maharashtra Board · Class 10 · Science
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What is animal classification and why is it important?
Answer
Animal classification is the formation of groups and sub-groups of animals based on similarities and differences. It makes studying the vast variety of animals easier, helps understand evolution, enab…
Who was the first person to classify animals and what criteria did he use?
Answer
Aristotle, the Greek philosopher, was the first to perform animal classification. He classified animals based on body size, habits, and habitats. This was known as the 'Artificial method' of classific…
What are the five main criteria used in the new system of animal classification?
Answer
1. Grades of organization (cellular, tissue, organ, organ-system) 2. Body symmetry (asymmetrical, radial, bilateral) 3. Germ layers (diploblastic or triploblastic) 4. Body cavity/coelom (acoelomate, p…
Distinguish between diploblastic and triploblastic animals with examples.
Answer
Diploblastic animals have two germ layers (endoderm and ectoderm) formed during embryonic development. Example: Cnidarians like Hydra. Triploblastic animals have three germ layers (endoderm, ectoderm,…
What is the difference between acoelomate, pseudocoelomate, and eucoelomate animals?
Answer
Acoelomate: No body cavity (Porifera, Cnidaria, Platyhelminthes) Pseudocoelomate: Body cavity not formed from mesoderm (Aschelminthes) Eucoelomate: True body cavity formed from mesoderm (Annelida and …
List the main characteristics of Phylum Porifera with examples.
Answer
1. Simplest body plan (sponges) 2. Numerous pores (ostia and oscula) 3. Aquatic, mostly marine 4. Asymmetrical body 5. Collar cells present 6. Sedentary (attached to substratum) 7. Supported by spicul…
What are the key features of Phylum Cnidaria and what are polyp and medusa forms?
Answer
Key features: Radially symmetrical, diploblastic, cnidoblast-bearing tentacles, mostly marine. Polyp: Cylindrical body form (like Hydra) Medusa: Umbrella-like body form (like Jellyfish) Examples: Hydr…
Why are Platyhelminthes called flatworms and what are their main characteristics?
Answer
Called flatworms because their body is slender and flat like a leaf or strip. Characteristics: 1. Most are endoparasites 2. Acoelomate and bilaterally symmetrical 3. Triploblastic 4. Hermaphrodite (bo…
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