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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.

Nephridia

B.

Flame cells

C.

Malpighian tubules

D.

Choanocytes
Correct Answer: A

Solution:

Nephridia are the excretory organs in annelids, functioning in osmoregulation and waste removal.

Chapter Concept:

Phylum Annelida

A.

It aids in digestion by storing excess food.

B.

It helps in buoyancy regulation, allowing the fish to maintain its depth without swimming.

C.

It acts as a respiratory organ, supplementing the gills.

D.

It is used for sound production to communicate with other fish.
Correct Answer: B

Solution:

The air bladder in Osteichthyes regulates buoyancy, enabling the fish to maintain its depth without expending energy on swimming.

Chapter Concept:

Cyclostomata and Pisces

A.

Presence of a notochord

B.

Body divided into proboscis, collar, and trunk

C.

Radial symmetry in adults

D.

Complete digestive system with mouth and anus
Correct Answer: B

Solution:

Phylum Hemichordata is characterized by a body divided into three distinct regions: proboscis, collar, and trunk. This is a unique feature that distinguishes them from other phyla.

Chapter Concept:

Phylum Hemichordata

A.

Cephalochordata

B.

Urochordata

C.

Vertebrata

D.

Hemichordata
Correct Answer: B

Solution:

In Urochordata, the notochord is present only in the larval tail and not in the adult form. This is a distinguishing feature of this subphylum.

Chapter Concept:

Notochord and Chordate Characteristics

A.

Porifera

B.

Coelenterata

C.

Arthropoda

D.

Ctenophora
Correct Answer: C

Solution:

Arthropoda exhibit organ-system level of organization, bilateral symmetry, and are coelomates, characterized by their jointed appendages and chitinous exoskeleton.

Chapter Concept:

Levels of Organisation in Animals

A.

Presence of mammary glands

B.

Four-chambered heart

C.

Pneumatic bones

D.

Viviparous reproduction
Correct Answer: C

Solution:

Aves have pneumatic bones, which are hollow and contain air sacs, reducing their weight and aiding in flight.

Chapter Concept:

Aves and Mammalia

A.

Presence of feathers

B.

Hair on the skin

C.

Mammary glands

D.

Four-chambered heart
Correct Answer: A

Solution:

Feathers are a characteristic feature of Aves, not mammals. Mammals have hair on their skin, mammary glands, and a four-chambered heart.

Chapter Concept:

Aves and Mammalia

A.

Bioluminescence

B.

Radial symmetry

C.

Presence of a notochord

D.

Comb plates for locomotion
Correct Answer: C

Solution:

Ctenophora are marine organisms known for their bioluminescence and radial symmetry. They possess comb plates for locomotion but do not have a notochord, which is characteristic of chordates.

Chapter Concept:

Phylum Ctenophora

A.

Bilateral symmetry

B.

Triploblastic body structure

C.

Presence of a true coelom

D.

Separate sexes with internal fertilization
Correct Answer: C

Solution:

Phylum Aschelminthes are pseudocoelomates, meaning they do not have a true coelom. They have a pseudocoelom instead.

Chapter Concept:

Phylum Aschelminthes

A.

Bilateral symmetry

B.

Triploblastic organization

C.

Presence of coelom

D.

Organ-level organization
Correct Answer: C

Solution:

Phylum Platyhelminthes is characterized by bilateral symmetry, triploblastic organization, and organ-level organization, but they are acoelomates, meaning they lack a coelom.

Chapter Concept:

Phylum Platyhelminthes

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Animal Kingdom

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True or False

Correct Answer: True

Solution:

Triploblastic animals are characterized by the presence of three germinal layers: ectoderm, mesoderm, and endoderm, which contribute to their increased structural complexity.

Chapter Concept :

Diploblastic and Triploblastic Organisation

Correct Answer: False

Solution:

The organ system level of organization is found in both pseudocoelomates and coelomates, as seen in phyla such as Aschelminthes (pseudocoelomates) and Annelida (coelomates).

Chapter Concept :

Levels of Organisation in Animals

Correct Answer: False

Solution:

Cnidarians possess radial symmetry, not bilateral symmetry, as indicated by their body plan where any plane passing through the central axis divides the organism into two identical halves.

Chapter Concept :

Phylum Coelenterata (Cnidaria)

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

Correct Answer: True

Solution:

The statement is true. All vertebrates possess a notochord at some stage of their development, which classifies them as chordates. However, not all chordates develop a vertebral column, which is characteristic of vertebrates.

Chapter Concept :

Protochordates and Vertebrates

Correct Answer: True

Solution:

Echinoderms, such as starfish and sea urchins, exhibit radial symmetry in their adult form, which is a key characteristic of this phylum.

Chapter Concept :

Symmetry in Animals

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:

Coelomates have a true coelom, which is a body cavity completely lined by mesodermal tissue.

Chapter Concept :

Coelom and Body Cavity Types

Correct Answer: True

Solution:

Segmentation is indeed a characteristic feature of the phylum Annelida, where the body is divided into repeated segments, influencing movement and organ function.

Chapter Concept :

Segmentation in Animals

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

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