NCERT Solutions for Class 11 Biology Chapter 4 - Animal Kingdom

Download Animal Kingdom NCERT Solutions PDF

Students who need help with animal classification can read Chapter 4. It covers everything from sponges to mammals. Students can download the PDF of the Class 11 Biology Chapter 4 - Animal Kingdom question answer from the link given below. Having ready-to-use solutions makes a big difference during preparation. The NCERT Solutions for Class 11 Biology are perfect for last-minute preparation or regular revision.

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Also Read,

• NCERT Notes for Class 11 Biology Animal Kingdom
• NCERT Exemplar for Class 11 Biology Animal Kingdom

Access the Class 11 Biology Chapter 4 - Animal Kingdom Solutions

Given below are the detailed solutions to all the questions given in the textbook. All the answers are prepared by subject experts, following the latest NCERT curriculum. Students can refer to the Animal Kingdom class 11 question answer 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 group animals and indicate their differences. Animals lack cell walls and are heterotrophic; mammals and other groups have additional distinguishing features (e.g., mammary glands in mammals). Without common fundamental features:

• It would be difficult to determine relationships among animals.

• Classification would become confusing and inconsistent.

• Understanding evolutionary history would be much harder.

In brief, these basic characteristics form the basis of animal classification and help us understand 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 Organisation: 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 the 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 Porifera, Coelenterata (Cnidaria), ctenophores, and platyhelminths.
• A pseudocoelom is present in some animals, which is not completely lined 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 stick to their hosts and obtain nutrition.

4. They lack well-developed locomotory organs; movement is by cilia and muscular action.

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 help 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 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 the capture of food.

Q9. "All vertebrates are chordates, but all chordates are 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. In 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 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 bodies 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

• NCERT Solutions for Class 11 Maths
• NCERT Solutions for Class 11 Chemistry
• NCERT Solutions for Class 11 Physics

Approach to Solve Animal Kingdom Class 11 Question Answer

The approach to solve questions of the Animal Kingdom chapter involves a clear understanding. Students can follow the steps given below:

• To understand the diversity of the animal kingdom, start with the classification of animals. Classification is based on features such as body symmetry, coelom, segmentation, etc.

• Go through all the terms like asymmetry, radial symmetry, and bilateral symmetry. Students can take help from the Class 11 Biology Chapter 4 - Animal Kingdom question answer.

• Prepare a table by writing down all the distinguishing features of phyla like Arthropoda, Mollusca, Chordata, etc.

• Study the features of these phyla using diagrams. Students can go through the Class 11 Biology Chapter 4 - Animal Kingdom Solutions. This helps them to remember their characteristics for a longer time.

• Try to solve a lot of questions from this chapter to gain confidence. Refer to the NCERT Solutions for Class 11 to get familiar with the pattern and difficulty level.

Important Question from NCERT Class 11 Biology Chapter 4

Given below is a question from the Animal Kingdom chapter along with the answers. Focusing on the questions given in the NCERT Solutions for Class 11 Biology Chapter 4 - Animal Kingdom helps to understand better.

Question 1: The following are the statements about non-chordates:
A. Gill slits perforate the pharynx.
B. Notochord is absent.
C. The central nervous system is dorsal.
D. Heart is dorsal if present.
E. Tail behind the body
Choose the most appropriate answer from the options given below:

1. A & C only

2. A, B & D only

3. B, D & E only

4. B, C & D only

Answer:

In invertebrates, the notochord, a defining feature of chordates, is absent, and their body structure is often supported by other means, like exoskeletons or hydrostatic skeletons. If a heart is present, it is typically located dorsally, unlike the ventral heart found in chordates. In addition, they lack a tail behind the body, which is a characteristic feature of chordates and plays a role in locomotion or balance in those organisms.

Hence, the correct answer is option 3, B, D & E only

Also, check the NCERT Books and the NCERT Syllabus here:

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

What Students Learn from Animal Kingdom NCERT Solutions

The Animal Kingdom chapter introduces students to the wide diversity of multicellular animals. It explains the classification, such as symmetry, level of organisation, body cavity, and mode of nutrition.

1. Students learn unique features and representative examples of each phylum from Porifera to Chordata.

2. The Animal Kingdom NCERT Solutions teaches about levels of organisation (cellular to organ-system), germ layers (diploblastic vs. triploblastic), and types of symmetry.

3. They will understand acoelomate, pseudocoelomate, and coelomate conditions, and the importance of segmentation in groups like Annelida and Arthropoda.

4. Students study open and closed circulatory systems, as well as the digestive systems through the Class 11 Biology Chapter 4 - Animal Kingdom question answer.

What Extra Should Students Study Beyond the NCERT for NEET?

To do well in NEET, students should study extra topics and practice more beyond the NCERT. The extra topics that students have to study are given below. Along with this, they should practice the diagrams provided in the NCERT Solutions for Class 11 Biology Chapter 4 - Animal Kingdom.

Chapter-Wise NCERT Solutions for Class 11 Biology

Below are the chapter-wise solutions: