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Class 11 Science (PCB)

Biology – Zoology

Animal Kingdom

Animal Kingdom

Action PlanNotesQuestionsMock-Test
Study Action Plan (Sorted by Difficulty)
Chordates vs Non-Chordates
Accuracy: 0%
Total Attempted0
Total Correct0
Total Incorrect0
Difficulty Level:
High
Examples and Diagnostic Characters of Animal Phyla
Accuracy: 0%
Total Attempted0
Total Correct0
Total Incorrect0
Difficulty Level:
High
Phylum-Level Comparative Features
Accuracy: 50%
Total Attempted10
Total Correct5
Total Incorrect5
Difficulty Level:
Medium
Cyclostomata and Pisces
Accuracy: 71%
Total Attempted87
Total Correct62
Total Incorrect25
Difficulty Level:
Medium
Animal Classification Basis
Accuracy: 73%
Total Attempted97
Total Correct71
Total Incorrect26
Difficulty Level:
Medium
Phylum Ctenophora
Accuracy: 75%
Total Attempted103
Total Correct77
Total Incorrect26
Difficulty Level:
Low
Phylum Annelida
Accuracy: 76%
Total Attempted99
Total Correct75
Total Incorrect24
Difficulty Level:
Low
Phylum Arthropoda
Accuracy: 76%
Total Attempted88
Total Correct67
Total Incorrect21
Difficulty Level:
Low
Levels of Organisation in Animals
Accuracy: 77%
Total Attempted119
Total Correct92
Total Incorrect27
Difficulty Level:
Low
Phylum Echinodermata
Accuracy: 77%
Total Attempted84
Total Correct65
Total Incorrect19
Difficulty Level:
Low
Coelom and Body Cavity Types
Accuracy: 78%
Total Attempted100
Total Correct78
Total Incorrect22
Difficulty Level:
Low
Amphibia and Reptilia
Accuracy: 81%
Total Attempted73
Total Correct59
Total Incorrect14
Difficulty Level:
Low
Phylum Coelenterata (Cnidaria)
Accuracy: 82%
Total Attempted94
Total Correct77
Total Incorrect17
Difficulty Level:
Low
Aves and Mammalia
Accuracy: 82%
Total Attempted118
Total Correct97
Total Incorrect21
Difficulty Level:
Low
Notochord and Chordate Characteristics
Accuracy: 82%
Total Attempted91
Total Correct75
Total Incorrect16
Difficulty Level:
Low
Phylum Aschelminthes
Accuracy: 83%
Total Attempted30
Total Correct25
Total Incorrect5
Difficulty Level:
Low
Phylum Mollusca
Accuracy: 84%
Total Attempted57
Total Correct48
Total Incorrect9
Difficulty Level:
Low
Phylum Chordata
Accuracy: 85%
Total Attempted59
Total Correct50
Total Incorrect9
Difficulty Level:
Low
Diploblastic and Triploblastic Organisation
Accuracy: 85%
Total Attempted60
Total Correct51
Total Incorrect9
Difficulty Level:
Low
Segmentation in Animals
Accuracy: 85%
Total Attempted88
Total Correct75
Total Incorrect13
Difficulty Level:
Low
Phylum Hemichordata
Accuracy: 86%
Total Attempted42
Total Correct36
Total Incorrect6
Difficulty Level:
Low
Phylum Platyhelminthes
Accuracy: 86%
Total Attempted79
Total Correct68
Total Incorrect11
Difficulty Level:
Low
Symmetry in Animals
Accuracy: 91%
Total Attempted68
Total Correct62
Total Incorrect6
Difficulty Level:
Low
Protochordates and Vertebrates
Accuracy: 92%
Total Attempted48
Total Correct44
Total Incorrect4
Difficulty Level:
Low
Phylum Porifera
Accuracy: 93%
Total Attempted46
Total Correct43
Total Incorrect3
Difficulty Level:
Low

Learning Objectives

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Learning Objectives

  • Understand the basis of animal classification.
  • Identify the levels of organization in animals.
  • Describe the characteristics of different animal phyla.
  • Explain the significance of symmetry in animal classification.
  • Differentiate between diploblastic and triploblastic organisms.
  • Recognize the importance of coelom in classification.
  • Discuss the concept of segmentation in animals.
  • Define notochord and its relevance to chordates.
  • Analyze the unique features of various animal groups.

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Revision Notes & Summary

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Animal Kingdom

4.1 Basis of Classification

  • Over a million species of animals exist, necessitating classification.
  • Classification helps assign systematic positions to newly described species.

4.1.1 Levels of Organisation

  • Cellular Level: Sponges exhibit loose cell aggregates.
  • Tissue Level: Coelenterates have cells arranged into tissues.
  • Organ Level: Platyhelminthes and higher phyla have tissues grouped into organs.

4.2 Classification of Animals

  • Fundamental features for classification include:
    • Level of organisation
    • Symmetry
    • Nature of coelom
    • Patterns of digestive, circulatory, or reproductive systems

Salient Features of Different Phyla

PhylumLevel of OrganisationSymmetryCoelomSegmentationDigestive SystemCirculatory SystemRespiratory SystemDistinctive Features
PoriferaCellularVariousAbsentAbsentAbsentAbsentAbsentBody with pores and canals in walls.
CoelenterataTissueRadialAbsentAbsentIncompleteAbsentAbsentCnidoblasts present.
CtenophoraTissueRadialAbsentAbsentIncompleteAbsentAbsentComb plates for locomotion.
PlatyhelminthesOrgan & Organ-systemBilateralAbsentAbsentIncompleteAbsentAbsentFlat body, suckers.
AschelminthesOrgan-systemBilateralPseudocoelomAbsentCompleteAbsentAbsentOften worm-shaped, elongated.
AnnelidaOrgan-systemBilateralCoelomatePresentCompletePresentAbsentBody segmentation like rings.
ArthropodaOrgan-systemBilateralCoelomatePresentCompletePresentPresentExoskeleton of cuticle, jointed appendages.
MolluscaOrgan-systemBilateralCoelomateAbsentCompletePresentPresentExternal skeleton of shell usually present.
EchinodermataOrgan-systemRadialCoelomateAbsentCompletePresentPresentWater vascular system, radial symmetry.
HemichordataOrgan-systemBilateralCoelomateAbsentCompletePresentPresentWorm-like with proboscis, collar and trunk.
ChordataOrgan-systemBilateralCoelomatePresentCompletePresentPresentNotochord, dorsal hollow nerve cord, gill slits with limbs or fins.

Examples of Animal Phyla

  • Porifera: Sponges (e.g., Sycon, Euspongia)
  • Ctenophora: Sea walnuts (e.g., Pleurobrachia)
  • Platyhelminthes: Flatworms (e.g., Taenia, Fasciola)
  • Aschelminthes: Roundworms (e.g., Ascaris, Wuchereria)
  • Annelida: Earthworms (e.g., Pheretima)
  • Arthropoda: Insects (e.g., Apis, Locusta)
  • Mollusca: Gastropods (e.g., Pila, Octopus)
  • Echinodermata: Starfish
  • Hemichordata: Acorn worms
  • Chordata: Vertebrates (e.g., mammals, birds)

Important Diagrams

Figure 4.5: Examples of Porifera

  • (a) Sycon
  • (b) Euspongia
  • (c) Spongilla

Figure 4.8: Example of Ctenophora

  • (a) Pleurobrachia

Figure 4.9: Examples of Platyhelminthes

  • (a) Tape worm
  • (b) Liver fluke

Figure 4.10: Example of Aschelminthes

  • Roundworm

Figure 4.11: Examples of Annelida

  • (a) Nereis
  • (b) Hirudinaria

Figure 4.12: Examples of Arthropoda

  • (a) Locust
  • (b) Butterfly
  • (c) Scorpion
  • (d) Prawn

Figure 4.13: Examples of Mollusca

  • (a) Pila
  • (b) Octopus
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Practice Test – MCQs, True/False

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Multiple Choice Questions

A.

Gills

B.

Book lungs

C.

Tracheal system

D.

Lungs
Correct Answer: D

Solution:

Arthropods have respiratory organs such as gills, book gills, book lungs, or a tracheal system, but not lungs.

Chapter Concept:

Phylum Arthropoda

A.

Porifera

B.

Echinodermata

C.

Chordata

D.

Mollusca
Correct Answer: B

Solution:

The water vascular system is a distinctive feature of Echinodermata, aiding in locomotion and food capture.

Chapter Concept:

Levels of Organisation in Animals

A.

Radula

B.

Tentacles

C.

Choanocytes

D.

Parapodia
Correct Answer: A

Solution:

Molluscs use a file-like rasping organ called radula for feeding.

Chapter Concept:

Phylum Mollusca

A.

Presence of a pseudocoelom

B.

Metameric segmentation

C.

Radial symmetry

D.

Open circulatory system
Correct Answer: B

Solution:

Annelids are characterized by metameric segmentation, where the body is divided into segments with a serial repetition of organs.

Chapter Concept:

Phylum Annelida

A.

Presence of a coelom

B.

Number of germ layers

C.

Type of symmetry

D.

Level of organization
Correct Answer: B

Solution:

Diploblastic organisms have two germ layers (ectoderm and endoderm), while triploblastic organisms have three germ layers (ectoderm, mesoderm, and endoderm).

Chapter Concept:

Animal Classification Basis

A.

Gills

B.

Tracheal system

C.

Book lungs

D.

Lungs
Correct Answer: D

Solution:

Arthropods have diverse respiratory systems including gills, tracheal systems, and book lungs, but they do not possess lungs.

Chapter Concept:

Phylum Arthropoda

A.

Presence of a notochord throughout life.

B.

Cartilaginous endoskeleton.

C.

Presence of an operculum.

D.

Bony endoskeleton.
Correct Answer: B

Solution:

Both Cyclostomata and Chondrichthyes have a cartilaginous endoskeleton, which distinguishes them from classes with a bony endoskeleton.

Chapter Concept:

Cyclostomata and Pisces

A.

Locomotion

B.

Respiration

C.

Feeding

D.

Reproduction
Correct Answer: C

Solution:

The radula in molluscs is a file-like rasping organ used for feeding, allowing them to scrape or cut food before ingestion.

Chapter Concept:

Phylum Mollusca

A.

Presence of scales and lungs

B.

Moist skin and ability to respire through skin

C.

Feathers and high metabolic rate

D.

Internal fertilisation and viviparity
Correct Answer: B

Solution:

Amphibians have moist skin and can respire through their skin, allowing them to live both in water and on land.

Chapter Concept:

Amphibia and Reptilia

A.

Presence of a notochord

B.

Dorsal, hollow nerve cord

C.

Exoskeleton made of chitin

D.

Paired pharyngeal gill slits
Correct Answer: C

Solution:

Chordates are characterized by the presence of a notochord, a dorsal, hollow nerve cord, and paired pharyngeal gill slits. An exoskeleton made of chitin is characteristic of arthropods, not chordates.

Chapter Concept:

Phylum Chordata

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Animal Kingdom

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True or False

Correct Answer: True

Solution:

Acoelomates are defined as animals that do not have a body cavity between the body wall and the gut wall. This characteristic is used in the classification of animals.

Chapter Concept :

Coelom and Body Cavity Types

Correct Answer: True

Solution:

Cnidarians, belonging to the phylum Coelenterata, have a tissue-level organization and are characterized by the presence of cnidocytes, which are specialized cells used for defense and capturing prey.

Chapter Concept :

Phylum Coelenterata (Cnidaria)

Correct Answer: True

Solution:

Sponges, classified under the phylum Porifera, are characterized by a cellular level of organization and are mostly asymmetrical. They possess a canal system for water flow and intracellular digestion.

Chapter Concept :

Phylum Porifera

Correct Answer: True

Solution:

The presence or absence of a coelom is a fundamental feature used in the classification of animals, as it determines whether an animal is acoelomate, pseudocoelomate, or coelomate.

Chapter Concept :

Animal Classification Basis

Correct Answer: True

Solution:

Phylum Hemichordata is characterized by worm-like marine animals with a body structure divided into proboscis, collar, and trunk. They possess an open circulatory system, which is a distinctive feature of this phylum.

Chapter Concept :

Phylum Hemichordata

Correct Answer: True

Solution:

Arthropods are characterized by having a chitinous exoskeleton and jointed appendages, which are significant adaptations that have allowed them to become the most diverse and largest animal phylum.

Chapter Concept :

Phylum Arthropoda

Correct Answer: True

Solution:

Phylum Aschelminthes, also known as roundworms, are characterized by bilateral symmetry, triploblastic pseudocoelomate body structure, and a complete alimentary canal, as described in the provided excerpts.

Chapter Concept :

Phylum Aschelminthes

Correct Answer: True

Solution:

Echinoderms, such as starfish, have radial symmetry in their adult form, which allows them to interact with their environment from all sides. However, during their larval stage, they exhibit bilateral symmetry, which is a common trait in the early development of many animal phyla.

Chapter Concept :

Symmetry in Animals

Correct Answer: True

Solution:

The organ system level of organization is indeed present in these phyla, as they exhibit complex structures with organs forming systems for specific physiological functions.

Chapter Concept :

Levels of Organisation in Animals

Correct Answer: True

Solution:

Chordates are defined by the presence of a notochord, which is a mesodermally derived rod-like structure formed on the dorsal side during embryonic development.

Chapter Concept :

Notochord and Chordate Characteristics

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