Biology · Class 11 Science

Ch 7Structural Organisation in Animals — Class 11 Biology, concept-first.

Across earlier chapters you met a wide range of organisms — from single-celled forms to complex multicellular animals — and saw how they meet their basic needs. In a unicellular organism, one single cell has to carry out every activity by itself: digestion, respiration, reproduction, and everything else.

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Concepts

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Key concepts

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Frog Digestive System

Alimentary canal and digestive glands of the frog including liver and pancreas.

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Chapter contents

The NCERT structure, section by section. Open a section to see its questions, then read the concept-first solution.

Introduction

Across earlier chapters you met a wide range of organisms — from single-celled forms to complex multicellular animals — and saw how they meet their basic needs.

7.1

Organ and Organ System

In a multicellular animal the basic types of tissues do not work in isolation. They organise, in specific proportion and pattern, to build the next level of structure.

7.2

Frogs

Frogs can live both on land and in freshwater, and they belong to the class Amphibia of the phylum Chordata.

7.2.1

Morphology

The skin of a frog is smooth and slippery because of the presence of mucus, and it is always kept in a moist condition.

7.2.2

Anatomy

The anatomy of the frog reveals several well-developed organ systems, each with a clear division of labour.

Summary

In a multicellular animal, no single cell does everything -- work is parcelled out among cells, tissues, organs and organ systems, and this division of labour is what lets the whole body keep function…

Exercises

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Exemplar Problems

Higher-order thinking / exemplar-style practice problems.

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