Chapter 4 Animal Kingdom 

Chapter 4 Biology Grade 11 Animal Kingdom. This article discusses NCERT notes for Chapter 4 Biology Grade 11, an important chapter of the curriculum. Leading experts and subject matter experts create Vidyakul's NCERT notes. Students can learn and practice questions from each topic in the chapter - Animal Kingdom.

Notes for Chapter 4 Biology Grade 11 is based on NCERT textbook and very easy to understand. NCERT has arranged the questions in the answer book so that they are likely to appear on the CBSE tests. Scholars at Vidyakul have compiled over 500 questions from over 40 books to help students practice and master their concepts.

CBSE CLASS 11 BIOLOGY  CH-4

Points to Remember

Students preparing for Class 11 Biology Chapter 4 can refer to the important points below.

• Animals without coelom or body cavities are called acoelomates, e.g., Cnidaria and Platyhelminthes.

• The four types of symmetry found in animals are spherical, radial, biradial, and bilateral.

• Arthropoda is the largest phylum in the animal kingdom.

• Agnatha is represented by the class Cyclostomata comprising lampreys and hagfishes.

• The phylum Chordata is named after the notochord, a stiff and flexible rod-like structure along the back lying ventral to nerve cord.

• Reptilia is the first class of terrestrial vertebrates characterised by the presence of dry and cornified skin.

 

 

Topics and Sub-topics

We have provided CBSE Class 11 Biology Chapter 4 and highlighted important topics to help students prepare well for the exam. Topics covered in this chapter are listed in the table below. Each topic has a variety of exercises to help students fully understand the concepts.

Students can learn concepts in depth by referring to Vidyakul NCERT notes. You can also practice each concept you learn and set up Vidyakul quizzes to gauge your level of understanding.

Sr. No.	Topic Name
Ex 4.1	Basis Of Classification
Ex 4.1.1	Levels Of Organisation
Ex 4.1.2	Symmetry
Ex 4.1.3	Diploblastic And Triploblastic Organisation
Ex 4.1.4	Coelom
Ex 4.1.5	Segmentation
Ex 4.1.6	Notochord
Ex 4.2	Classification of Animals
Ex 4.2.1	Phylum – Porifera
Ex 4.2.2	Phylum – Coelenterata (Cnidaria)
Ex 4.2.3	Phylum – Ctenophora
Ex 4.2.4	Phylum – Platyhelminthes
Ex 4.2.5	Phylum – Aschelminthes
Ex 4.2.6	Phylum – Annelida
Ex 4.2.7	Phylum – Arthropoda
Ex 4.2.8	Phylum – Mollusca
Ex 4.2.9	Phylum – Echinodermata
Ex 4.2.10	Phylum – Hemichordata
Ex 4.2.11	Phylum – Chordata.

Frequently Asked Questions

• What are triploblastic animals?

Animals with three germ layers- the ectoderm, mesoderm, and endoderm are called triploblastic animals. All multicellular animals including  Molluscs, worms, arthropods, Echinodermata and vertebrates are examples of triploblastic animals.

• Differentiate between open and closed circulatory system?

The open circulatory system is found in all invertebrates. In this system of circulation, the blood flows freely into cavities, as there are no blood vessels to conduct the blood.

The closed circulatory system is found in all vertebrates and also in few invertebrates like earthworms.  In this system of circulation, the presence of blood vessels helps in circulating blood throughout the body.

• What is the importance of feathers in birds?

Feathers are found in all birds (Aves). They are the epidermal growths that form the distinctive outer covering of the bird’s body and are found on both wings and the tail. 

In birds, feathers help in:

1. Controlling flight.

2. Serve as camouflage against their predators.

3. In many bird species, the different patterns of feathers and attractive colours are part of the sexual dimorphism.

4. Insulating birds from water and cold temperatures and also provide insulation to their eggs and young ones.

5. In some species of birds like owl and woodpecker, feathers are used for balancing while walking on the ground, climbing the trees, and also helps in hearing and making different sounds like drumming, humming and whistling.

• Differentiate between open and closed circulatory system.

Open Circulatory System	Closed Circulatory System
Blood flows through open spaces called lacunae.	Blood flows through closed vessels.
Circulation takes a longer time.	Circulation takes a shorter time.
Haemocoel is present.	Haemocoel is absent.
The blood flows with slow velocity.	The blood flows with a higher velocity.
Internal organs are in direct contact with blood.	Internal organs are in direct contact with blood.
Blood flow cannot be regulated.	Blood flow can be regulated.
Supply and removal of materials are slow.	Supply and removal of materials are rapid.
Materials are exchanged between blood and lacunae.	Materials are exchanged between blood and tissues through sinuses.

Practice Questions

1. What is meant by metamerism?

2. List out the characteristic features of Phylum Annelida.

3. List 5 organisms that belong to the phylum Arthropoda.

4. What is the radula? Explain its function.

5. What are Homoiothermous animals? Give two examples.

6. What are oviparous animals? How are they different from viviparous animals.

Download this solution for FREE Download this PDF

Download Vidyakul App for more Important notes, PDF's and Free video lectures.