Animal Kingdom
Mizoram Board · Class 11 · Biology
Flashcards for Animal Kingdom — Mizoram Board Class 11 Biology. Quick Q&A cards covering key concepts, definitions, and formulas.
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What are the four levels of organization found in the animal kingdom? Give an example of each.
Answer
1. Cellular level - Sponges (loose cell aggregates) 2. Tissue level - Coelenterates (cells arranged into tissues) 3. Organ level - Platyhelminthes (tissues grouped to form organs) 4. Organ system leve…
Define symmetry in animals and distinguish between asymmetrical, radial, and bilateral symmetry with examples.
Answer
Asymmetrical: No plane divides the body into equal halves (e.g., Sponges) Radial symmetry: Any plane through the central axis divides the body into identical halves (e.g., Coelenterates, Echinoderms) …
What is the difference between diploblastic and triploblastic animals?
Answer
Diploblastic animals: Have two embryonic layers - external ectoderm and internal endoderm with undifferentiated mesoglea in between (e.g., Coelenterates) Triploblastic animals: Have three embryonic la…
Distinguish between coelomates, pseudocoelomates, and acoelomates with examples.
Answer
Coelomates: Body cavity lined by mesoderm (true coelom) - Annelids, Molluscs, Arthropods, Chordates Pseudocoelomates: Body cavity not lined by mesoderm, mesoderm present as scattered pouches - Aschelm…
What is metamerism? Give an example.
Answer
Metamerism is the phenomenon where the body is externally and internally divided into segments with serial repetition of at least some organs. Example: Earthworm shows metameric segmentation - the bod…
List the key characteristics of Phylum Porifera.
Answer
- Commonly known as sponges - Marine, mostly asymmetrical - Cellular level of organization - Water transport/canal system with ostia and osculum - Choanocytes line the spongocoel - Intracellular diges…
What are cnidoblasts and what is their function?
Answer
Cnidoblasts (or cnidocytes) are specialized cells containing stinging capsules called nematocysts. They are present on tentacles and body of cnidarians. Functions: 1. Anchorage 2. Defense 3. Capture o…
Explain metagenesis with an example.
Answer
Metagenesis is the alternation of generations seen in some cnidarians where they exist in both polyp and medusa forms. Process: Polyps produce medusae asexually → Medusae form polyps sexually Example:…
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