Animal Kingdom — Class 11 Biology NCERT Solutions (Free)
Free step-by-step NCERT solutions for Class 11 Biology chapter "Animal Kingdom" — 8 important questions with detailed answers for CBSE board exam preparation.
TL;DR: Free step-by-step NCERT solutions for Class 11 Biology chapter "Animal Kingdom" — 8 important questions with detailed answers for CBSE board exam prep…
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Key Questions Covered:
- Define phylum Porifera and name two characteristics.
- What is a cnidocyte? Where is it found?
- Distinguish between radial and bilateral symmetry with examples.
- + 5 more questions in the full chapter
Solutions Summary:
| Question | Status |
|---|---|
| Define phylum Porifera and name two characteristics. | ✓ Solved |
| What is a cnidocyte? Where is it found? | ✓ Solved |
| Distinguish between radial and bilateral symmetry with ex… | ✓ Solved |
Showing 3 of 8 questions
Q1: Define phylum Porifera and name two characteristics.
Porifera are the simplest multicellular animals, commonly called sponges. Two key characteristics are:
1. Presence of pores or ostia on the body surface through which water enters.
2. Absence of true tissues and organs; body composed of loosely organized cells.
Q2: What is a cnidocyte? Where is it found?
A cnidocyte is a specialized stinging cell found in organisms of phylum Cnidaria (e.g., jellyfish, sea anemones, corals). It contains a nematocyst, an organelle with a coiled thread-like structure that ejects a toxin when triggered, used for capturing prey and defense.
Q3: Distinguish between radial and bilateral symmetry with examples.
Radial symmetry: Body parts arranged around a central axis; organism can be divided into equal halves by any plane passing through the center. Example: Sea anemone, jellyfish.
Bilateral symmetry: Body has a distinct anterior (head) and posterior (tail) end; can be divided into identical left and ri...
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