Structural Organisation in Animals — Chapter Summary
CBSE · Class 11 · Biology
Summary of Structural Organisation in Animals for CBSE Class 11 Biology. Part of the CBSE Class 11 Biology syllabus.
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Overview
Structural organisation in animals shows how cells, tissues, organs, and organ systems work together to carry out life processes efficiently. In multicellular animals, similar cells with intercellular substances form tissues. Tissues combine to form organs, and organs work together as organ systems.
Key Concepts
A tissue is a group
A tissue is a group of similar cells along with intercellular substances performing a specific function. Complex animals have four basic types of tiss
Frogs belong to class Amphibia
Frogs belong to class Amphibia of phylum Chordata. Rana tigrina is the most common frog species found in India.
Frog skin is smooth
Frog skin is smooth, slippery, and moist due to mucus. The dorsal side is olive green with dark irregular spots, while the ventral side is pale yellow
The frog body has head
The frog body has head and trunk only; neck and tail are absent. Eyes are covered by a nictitating membrane while in water. External ear is absent and
Frog is a carnivore with
Frog is a carnivore with a short alimentary canal. Food is captured by the bilobed tongue. Digestion begins with HCl and gastric juices in the stomach
Learning Objectives
- Understand the levels of organisation from cells to organ systems
- Define tissue and recognise its role in multicellular animals
- Describe the external morphology of frog
- Explain the major organ systems of frog and their functions
- Identify the special features of frog circulation, respiration, excretion, nervous system, and reproduction
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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