Zoology · Class 11 Science
Ch 2Structural Organisation in Animals — Class 11 Zoology, 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.
Key concepts
Hover a concept to preview it and jump to its most relevant Q&A.
Frog Digestive System
Alimentary canal and digestive glands of the frog including liver and pancreas.
Most relevant Q&A
- Draw a neat diagram of digestive system of frog.Free
- Mention the function of the Ureters in frog.Preview
- The digestive system of frog is made of the following parts. Arrange them in an order beginning from mouth. Mouth, oesophagus, buccal cavity…Preview
- Special venous connection between liver and intestine and between kidney and intestine is found in frog, what are they called?Preview
In previous exams
How often this chapter’s concepts have been examined — real appearance data, never estimated.
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.
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.
Frogs
Frogs can live both on land and in freshwater, and they belong to the class Amphibia of the phylum Chordata.
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.
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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- Q1Match the following and choose the correct option. Column I: A. Touch B. Smell C. Cranial nerves D. Medulla oblongata Column II: i. Nasal ep…Free
- Q2Identify the sex of a frog in which sound producing vocal sacs are present.Free
- Q3Name the process by which a tadpole develops into an adult frog.Free
- Q4Give two identifying features of an adult male frog.Preview
- Q5The digestive system of frog is made of the following parts. Arrange them in an order beginning from mouth. Mouth, oesophagus, buccal cavity…Preview
- Q6What is the difference between cutaneous and pulmonary respiration?Preview
- Q7Special venous connection between liver and intestine and between kidney and intestine is found in frog, what are they called?Preview
- Q8Frogs are beneficial for mankind, justify the statement.Preview
- Q9The body of sponges does not possess tissue level of organisation though it is made of thousands of cells. Comment.Preview
- Q10Structural organisation in animals attains different levels as cell - organ - organ system. What is missing in this chain? Mention the signi…Preview
- Q11Common name of some animals are given in Column A, write their scientific name in Column B. Column A: a. Tiger b. Peacock c. Housefly Column…Preview
- Q12Frog is a poikilotherm, exhibits camouflage and undergoes aestivation and hibernation, how are all these beneficial to it?Preview
- Q13Write the functions in brief in column B, appropriate to the structures given in column A. Column A: a. Nictitating membrane b. Tympanum c.…Preview
- Q14Draw a neat and well labelled diagram of male reproductive system of a frog.Preview