NCERT Solutions for Class 11 Biology Chapter 4 Animal Kingdom

NCERT Solutions for Class 11 Biology Chapter 4 Animal Kingdom: There are more than a million animal species known to exist, and each one is different in its own manner. In order to understand them better, scientists group animals according to fundamental characteristics such as body form and cell organisation. This helps to understand their large variety. Animal Kingdom NCERT Solutions for Class 11 provide detailed answers to help students understand the features and classification of animals.

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This Story also Contains

1. NCERT Solutions For Class 11 Biology Animal Kingdom PDF Download
2. NCERT Solutions for Class 11 Biology Chapter 4 Animal Kingdom Solved Exercise
3. Animal Kingdom Practice Problems for Class 11 Biology
4. Marks Weightage of Animal Kingdom in Class 11 Biology
5. Chapter Wise NCERT Solutions for Class 11 Biology

Chapter 4 of the NCERT book for Class 11 Biology, explains these methods of classification in detail. NCERT Solutions gives clear answers to all the questions of the chapter, making learning simpler. These answers are based on the new CBSE syllabus and help students in preparing for exams. It makes complex topics easy, improves understanding, and increases confidence. Students can download these solutions easily to study effectively and perform well.

NCERT Solutions For Class 11 Biology Animal Kingdom PDF Download

Given below is the PDF of the detailed question and answer of this chapter:

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Also Read,

• NCERT Notes for class 11 biology chapter 4 animal kingdom
• NCERT Exemplar for class 11 biology chapter 4 animal kingdom

NCERT Solutions for Class 11 Biology Chapter 4 Animal Kingdom Solved Exercise

Given below are the exercise questions with detailed explanations for better understanding.

Q1. What are the difficulties that you would face in the classification of animals if common fundamental features are not taken into account?

Answer: Basic characteristics help in grouping animals while indicating their differences. All animals do not have cell walls and are dependent on other organisms for nutrition, but mammals have special characteristics such as mammary glands.

Without these basic characteristics, it would be hard to classify because:

• We will not be able to observe how animals are related.
• Classification of animals would be confusing.
• Studying how animals evolved would be harder.

In brief, basic characteristics are responsible for classifying animals and telling us about their evolution.

Q2. If you are given a specimen, what are the steps that you would follow to classify it?

Answer: To identify an unknown specimen, look at these most important features:

1. Level of Organization: Cells, tissues, or organs.

2. Body Symmetry: Radial or bilateral.

3. Germ Layers: Two (diploblastic) or three (triploblastic).

4. Body Cavity: Present or absent.

5. Coelom: True (coelomate), false (pseudocoelomate), or none (acoelomate).

Q3. How useful is the study of the nature of body cavity and coelom in the classification of animals?

Answer: The coelom and body cavities are important in the classification of animals. A coelom is a body cavity filled with fluid, lined by embryonic tissue.

• True coelomates are annelids, molluscs, arthropods, echinoderms, hemichordates, and chordates.
• Animals that lack a coelom (acoelomates) are poriferans, cnidarians, ctenophores, and platyhelminths.
• A pseudocoelom is present in some animals, which is not lined completely by mesoderm but develops from the blastocoel of the embryo. Aschelminthes fit into this category.

Dividing animals into categories according to their coelom helps us to understand their development and evolutionary history.

Q4. Distinguish between intracellular and extracellular digestion.

Answer: The differences between intracellular and extracellular digestion are as follows

Q5. What is the difference between direct and indirect development?

Answer: The differences between direct and indirect development are as follows

Q6. What are the peculiar features that you find in parasitic Platyhelminthes?

Answer: Platyhelminthes have several unique characteristics:

1. They have a thick tegument that shields them from the digestive enzymes of their hosts.

2. Their bodies are dorsoventrally flattened, i.e., flat from top to bottom.

3. They have suckers and hooks that help them in sticking to their hosts and obtaining nutrition.

4. They do not possess organs for movement, so they use other means to move.

5. Their reproductive system is well developed, and they are mostly hermaphroditic, having both male and female reproductive organs.

Q7. What are the reasons that you can think of for the arthropods to constitute the largest group of the animal kingdom?

Answer: The reasons for arthropods being the largest group of animals are as follows:

1. They have a thick cuticle that helps them to thrive in many types of environments, particularly on land.

2. They have striated muscles that help in rapid and effective movement.

3. They have a tracheal system of respiration that brings oxygen directly to their cells, which is extremely effective.

4. They possess joint appendages that are capable of performing numerous different functions, so they are very adaptable.

5. They have a highly developed nervous system and sense organs that make them effectively sense and react to their surroundings.

6. They communicate using pheromones, which help in social behaviour and reproduction.

Q8. The water vascular system is the characteristic of which group of the following:

(a) Porifera

(b) Ctenophora

(c) Echinodermata

(d) Chordata

Answer: The correct option is (c) Echinodermata

The water vascular system is a characteristic feature of echinoderms which helps in locomotion, respiration and capturing of food.

Q9. "All vertebrates are chordates but all chordates are not vertebrates." Justify the statement.

Answer: Phylum Chordata contains animals that have a notochord, i.e., an elastic rod-shaped structure. Phylum Chordata is still divided into three sub-phyla: Urochordata, Cephalochordata, and Vertebrata. During vertebrates, the notochord is superseded by a vertebral column, but within urochordates and cephalochordates there is no vertebral column present. Therefore, all vertebrates are chordates, but they are not necessarily vertebrates as they can also be urochordates or cephalochordates.

Q10. How important is the presence of an air bladder in Pisces?

Answer: Osteichthyes (bony fishes, such as salmon) have an air bladder, which keeps them buoyant and prevents them from sinking in water. It makes them remain at a specific depth without swimming continuously. Chondrichthyes (cartilaginous fishes, such as sharks) do not have an air bladder. They need to swim continuously, employing their fins and body to remain afloat to avoid sinking.

The air bladder functions as a buoyancy support whereas the sharks survive using motion.

Q11. What are the modifications that are observed in birds that help them fly?

Answer: Birds have some adaptations that help them to fly:

• They have light bones with air-filled cavities, which lighten their load and reduce the effort of flying.
• A streamlined body cuts the resistance of the air, making it move smoothly through the air.
• Powerful flight muscles help in flapping the wings.
• The front limbs are modified into wings for flight, and the hind limbs are used for walking and perching.
• Additional air sacs in their body supply sufficient oxygen for extensive flights.
• These adaptations render birds ideally suited to flight.

Q12. Could the number of eggs or young ones produced by an oviparous and viviparous mother be equal? Why?

Answer: Oviparous creatures lay eggs outside the body and generally give birth to a greater number of offspring as they are given little parental care and exposed to severe environmental conditions. Viviparous creatures, on the other hand, give birth to live offspring and offer care both pre-and post-birth. This greater parental care leads to greater survival rates, reducing the necessity for a high number of offspring. Thus, the number of eggs or young ones given birth to by oviparous and viviparous mothers is not the same.

Q13. Segmentation in the body is first observed in which of the following:

(a) Platyhelminthes

(b) Aschelminthes

(c) Annelida

(d) Arthropoda

Answer: The correct option is (c) Annelida

Q14. Match the following:
(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

Answer: (a)-(viii), (b)-(v), (c)-(iv), (d)-(i), (e)-(ii), (f)- (vii), (g)- (iii), (h)- (vi)

Q15. Prepare a list of some animals that are found parasitic on human beings.

Answer: Taenia ( Tapeworm)

Ascaris (roundworm)

Ancylostoma (hookworm)

Enterobius (pinworm)

Wuchereria (filarial worm)

NCERT Solutions for Class 11: Subject-wise

This page gives properly formatted answers to help students understand important concepts clearly. The chapter discusses the huge diversity of the animal kingdom based on differences in structural organization, body symmetry, coelom, and different physiological systems like digestion, circulation, and reproduction. It also discusses the foundation of the classification of animals, including important phyla and their characteristic features. Knowing such concepts helps in understanding the evolutionary relationships between various species.

List of subtopics covered in Chapter 4 Animal Kingdom class 11:

To know the important topics of Biology Chapter 4, go through the listed topics below.

4.1 Basis of Classification

4.2 Classification of Animals

Animal Kingdom Practice Problems for Class 11 Biology

Sharpen your concepts of the Animal Kingdom with these practice questions that cover essential concepts, classifications, and characteristics of various animal groups.

Question 1:

One of the representatives of phylum Arthropoda are:

a) flying fish

b) cuttle fish

c) silver fish

d) puffer fish

Answer:

Silver fish is an insect and belongs to phylum Arthropoda. It is a small, wingless insect known for its silvery-grey color and fish-like movement. Hence, option (c) is correct.

Question 2:

What are acoelomate animals?

Answer:

Acoelomate animals refer to animals that are not having a body cavity. Examples: Porifera and flatworms.

Question 3:

What is metamerism?

Answer:

Metamerism is the process of repetition of a succession of homologous structures along the anterior-posterior axis.

Question 4:

Differentiate between homoeothermal and poikilothermal organisms.

Answer:

Question 5:

List four features of Arthropoda and give examples.

Answer:

Four features of Athropoda are give below:

1- They have jointed appendages that is used for locomotion or feeding or sensory purposes.

2- Having organ-system level of organization. Body triploblastic, coelomate, bilaterally symmetrical, and metamerically segmented.

3- Digestive tract is complete and circulatory system is open.

4- Sexes separate with evident sexual dimorphism, and fertilization is internal.

Examples- Limulus (king crab), Palamnaeus (scorpion), Cancer (crab) etc.

Question 6:

Mention the unique features of nematodes.

Answer:

1- Unique features of Phylum Nematodes are listed below:

2- Free-living in fresh water and marine waters and also on soil.

3- Body unsegmented, elongated, cylindrical and vermiform with tapering ends.

4- Body triploblastic, bilaterally symmetrical, with a pseudocoel body cavity.

5- Digestive tract is a straight tube with a terminal mouth, anus present.

6- Circulatory and respiratory system absent, and respiration through general body surface.

7- Reproductive system well-developed, usually unisexual with sexual dimorphism, males smaller than females.

8- Fertilization internal and development usually direct.

Question 7:

Mention the important features of coelenterata with examples.

Answer:

Coelenterata is characterized by the presence of the following features:

1- Members are mostly marine, sessile or free swimming.

2- Usually radially symmetric in adult stage.

3- Possess tissue level of body organisation.

4- Diploblastic animals that is body wall composed of two layers of cells, one is outer ectoderm and an inner endoderm.

5- Presence of a single body cavity called coelenteron.

6- Exhibit a blind sac body plan that is there single opening for injestion and digestion.

7- Presence of nematocysts that is the stringing cells which are organs of defense and offence.

8- Nervous system is simple and forms a diffuse network.

9- Vascular, excretory, and respiratory systems absent.

10- Asexual reproduction by fission or budding and sexual reproduction by gamete formation sperms and ova.

11- Development is holoblastic.

Examples- Hydra, Obelia, Physalia, Aurelia, Metridium etc.

Marks Weightage of Animal Kingdom in Class 11 Biology

This chapter has importance in both school exams and NEET. In school exams, it typically carries a weightage of 6 to 8 marks, often through short or long answer questions. For NEET, this chapter usually contributes 2 to 3 questions, accounting for around 8 to 12 marks, making it a high-priority topic for all students.

Chapter Wise NCERT Solutions for Class 11 Biology

Below mentioned are the Chapterwise solutions:

Also, check NCERT Books and NCERT Syllabus here:

• NCERT Books Class 11 Biology
• NCERT Syllabus Class 11 Biology
• NCERT Books Class 11
• NCERT Syllabus Class 11