NCERT solutions for class 11 biology chapter 4 animal kingdom: This chapter tells about the Animal Kingdom. When you look around, you will observe that there are different animals with different structures and appearances. As over a million species of animals have been discovered till now, the need for classification becomes all the more important. NCERT solutions for class 11 biology chapter 4 animal kingdom contains solutions which comprise of an explanation of all the questions which are based on the kingdom of animals. In solutions of NCERT class 11 biology chapter 4 animal kingdom you will study the basic fundamental features such as level of organization, symmetry, cell organization, coelom, segmentation, notochord, etc., which have enabled us to broadly classify the animal kingdom. Besides the fundamental features, there are many other distinctive characters which are specific for each class. NCERT solutions for class 11 biology chapter 4 animal kingdom will be also providing you answers related to the questions which are based on the classification of animals. If you are looking for an answer from any other chapter even from any other class then go with NCERT Solutions, there you will get all the answers of NCERT easily.
Here are the important topics of CBSE NCERT solutions for class 11 biology chapter 4 animal kingdom given below:
4.1 Basis of Classification
4.1.1 Levels of Organisation
4.1.3 Diploblastic and Triploblastic Organisation
4.2 Classification of Animals
4.2.1 Phylum – Porifera
4.2.2 Phylum – Coelenterata (Cnidaria)
4.2.3 Phylum – Ctenophora
4.2.4 Phylum – Platyhelminthes
4.2.5 Phylum – Aschelminthes
4.2.6 Phylum – Annelida
4.2.7 Phylum – Arthropoda
4.2.8 Phylum – Mollusca
4.2.9 Phylum – Echinodermata
4.2.10 Phylum – Hemichordata
4.2.11 Phylum – Chordata
220.127.116.11 Class – Cyclostomata
18.104.22.168 Class – Chondrichthyes
22.214.171.124 Class – Osteichthyes
126.96.36.199 Class – Amphibia
188.8.131.52 Class – Reptilia
184.108.40.206 Class – Aves
220.127.116.11 Class – Mammalia
Animal Kingdom of class 11 Biology will also tell about other things that come under the Animal Kingdom. Porifera includes multicellular animals that exhibit a cellular level of organization and have characteristic flagellated choanocytes. You will also study annelids, that are metamerically segmented animals with a true coelom. Solutions for NCERT class 11 biology chapter 4 animal kingdom will explain to you all the answers which are related to this topic.
After going through NCERT Class 11 Biology Chapter 4 - Animal Kingdom you must be able to understand all the answer of the following questions:
NCERT solutions for class 11 biology chapter 4 animal kingdom- Solved Exercise Questions
Q1. What are the difficulties that you would face in classification of animals, if common fundamental features are not taken into account?
The fundamental characteristics are basically used to establish relationships between animals while specific characteristics show us how animals despite having similar fundamental characteristics differ from each other. For example, all animals lack a cell wall and are heterotrophs, these are the fundamental characters that put all animals together in kingdom Animalia. However, the presence of mammary glands is a specific character that differentiates mammals from other vertebrates and animals. If common fundamental features are not taken into account then
1. The interrelationship among different animals will not be traceable.
2. The picture of all animals at a glance will not be projected.
3. We won't be able to get a clear picture of how evolution occurred.
Q3. How useful is the study of the nature of body cavity and coelom in the classification of animals?
The fluid-filled body cavity derived and lined by mesoderm is called coelom. The study of the nature of the body cavity and coelom is useful because it plays a prominent role in the classification of animals. The animals bearing a coelom are called coelomate while those lacking coelom are called acoelomate. A different type of coelom is also found in animals that are derived from blastocoel of blastula is called pseudocoelom. This coelom is not lined by mesoderm. The coelomates include annelids, molluscs, arthropods, echinoderms, hemichordates, and chordates. Aschelminthes are pseudocoelomates. Acoelomates are poriferans, cnidarians, ctenophores and Platyhelminthes.
The differences between intracellular and extracellular digestion are as follows
|The process of digestion of food takes place inside the cells
||The process of digestion of food takes place outside the cells in the alimentary canal.
|Only a few enzymes are involved in the process of digestion
||A number of enzymes are involved in extracellular digestion
|The products of digestion are diffused into the cytoplasm
||The products of digestion across the intestinal wall into the body parts
|Mostly seen in unicellular animals
||Mostly seen in multicellular animals
Q5. What is the difference between direct and indirect development?
The differences between direct and indirect development are as follows
|In this type of development, an embryo develops into a young one without any intermediate larval stage
||In this type of development, an embryo develops into a young one with some intermediate larval stages.
|Young ones resemble the adult
||Young ones do not resemble the adult
|Seen in fishes, reptiles, birds and mammals
||Seen in invertebrates and amphibians
Q6. What are the peculiar features that you find in parasitic platyhelminthes?
Platyhelminthes are mostly parasites. The peculiar features of platyhelminthes are as follows
1. The body of platyhelminthes is covered by thick body covering i.e. tegument. It protects the animal from the action of the digestive enzymes of the host.
2. The body of platyhelminthes is dorsoventrally flattened.
3. Platyhelminthes possess adhesive structures such as suckers and hookers that are helpful in deriving nutrition from the host body
4. Locomotory organs are absent
5. The reproductive system is well developed. Mostly they are hermaphrodite.
Q7. What are the reasons that you can think of for the arthropods to constitute the largest group of the animal kingdom?
The reasons for arthropods being the largest group of animals are as follows:
1. Presence of tough cuticle for protection of the body. It also helps in tolerating diverse terrestrial conditions.
2. Presence of striated muscles for quick movements
3. Tracheal respiration for direct supply of oxygen as in insects
4. Presence of jointed appendages for performing diverse functions
5. Well developed nervous system and sense organs.
6. Presence of pheromones for communication
Water vascular system is a characteristic feature of echinoderms which help in locomotion, respiration and capturing of food.
Q9. "All vertebrates are chordates but all chordates are not vertebrates&rdquo." Justify the statement.
Phylum chordata includes animals characterised by the presence of notochord. This phylum includes sub-phyla urochordata, cephalochordata and vertebrata. In vertebrates, the notochord is replaced by vertebral column, in urochordates and cephalochordates vertebral column is absent. Thus, all vertebrates are chordates but all chordates are not vertebrates as they can be urochordates and cephalochordates also.
The air bladder is found to be present in the members of class Osteichthyes while it is absent in Chondrichthyes. The main function of air bladder is to regulate buoyancy and help the fishes to float in the water. It also prevents them from sinking in the water. Since Chondrichthyes do not have air bladder they have to swim continuously to avoid sinking.
Q11. What are the modifications that are observed in birds that help them fly?
Modifications in birds to help them fly are as follows:
1. The bones of birds are pneumatic. These contain air cavities making the bones light. This feature helps the birds in flying.
2. The body of birds is streamlined offering least resistance while flying.
3. Flight muscles are well developed
4. Forelimbs of birds are modified into wings to allow flying. Hindlimbs are used for walking, perching etc.
5. Additional air sacs are present to supplement respiration.
Q12. Could the number of eggs or young ones produced by an oviparous and viviparous mother be equal? Why?
No, the number of eggs produced in oviparous animals and young ones in viviparous animals are not equal. It is because oviparous animals lay eggs outside the body of female in water, land etc so these eggs do not get the conditions that are necessary for the development and hatching of the eggs. Thus, due to the lack of parental care out of the total eggs produced the chances of survival are very low. To compensate for this loss many eggs are produced. On the other hand, the embryos of viviparous animals are inside the body of a female and they get proper nourishment and conditions necessary for their growth and development. Even after they are born, they are provided with parental care. So, the chances of survival are high and only a few young ones could be supported.
(a) Operculum (i) Ctenophora
(b) Parapodia (ii) Mollusca
(c) Scales (iii) Porifera
(d) Comb plates (iv) Reptilia
(e) Radula (v) Annelida
(f ) Hairs (vi) Cyclostomata and Chondrichthyes
(g) Choanocytes (vii) Mammalia
(h) Gill slits (viii) Osteichthyes
(a)-(viii), (b)-(v), (c)-(iv), (d)-(i), (e)-(ii), (f)- (vii), (g)- (iii), (h)- (vi)
(a) Operculum (viii) Osteichthyes
(b) Parapodia (v) Annelida
(c) Scales (iv) Reptilia
(d) Comb plates (i) Ctenophora
(e) Radula (ii) Mollusca
(f ) Hairs (vii) Mammalia
(g) Choanocytes (iii) Porifera
(h) Gill slits (vi) Cyclostomata and Chondrichthyes
If you are unable to determine these questions or facing any problem to understand them, then go through the book again and then try to solve all the given questions by yourself and then match it from the CBSE NCERT solutions for class 11 biology chapter 4 animal kingdom, as it will help you to prepare not only for the 12th board exam even also for other competitive exams like NEET.
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- NCERT is the base of your learning.
- CBSE NCERT solutions for class 11 biology chapter 4 animal kingdom will also help you with competitive exams like NEET.
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- NCERT solutions for class 11 biology chapter 4 animal kingdom will also help you in your 12th board exam.
- It will also boost your knowledge.