Which feature is NOT a characteristic of the phylum Annelida?

Correct Option: B. Solution: Annelids are coelomate, not pseudocoelomate.

What type of symmetry do ctenophores exhibit?

Correct Option: B. Solution: Ctenophores are radially symmetrical organisms.

Animal Kingdom

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CBSE Learning Objectives – Key Concepts & Skills You Must Know

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.

CBSE Revision Notes & Quick Summary for Last-Minute Study

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

Phylum	Level of Organisation	Symmetry	Coelom	Segmentation	Digestive System	Circulatory System	Respiratory System	Distinctive Features
Porifera	Cellular	Various	Absent	Absent	Absent	Absent	Absent	Body with pores and canals in walls.
Coelenterata	Tissue	Radial	Absent	Absent	Incomplete	Absent	Absent	Cnidoblasts present.
Ctenophora	Tissue	Radial	Absent	Absent	Incomplete	Absent	Absent	Comb plates for locomotion.
Platyhelminthes	Organ & Organ-system	Bilateral	Absent	Absent	Incomplete	Absent	Absent	Flat body, suckers.
Aschelminthes	Organ-system	Bilateral	Pseudocoelom	Absent	Complete	Absent	Absent	Often worm-shaped, elongated.
Annelida	Organ-system	Bilateral	Coelomate	Present	Complete	Present	Absent	Body segmentation like rings.
Arthropoda	Organ-system	Bilateral	Coelomate	Present	Complete	Present	Present	Exoskeleton of cuticle, jointed appendages.
Mollusca	Organ-system	Bilateral	Coelomate	Absent	Complete	Present	Present	External skeleton of shell usually present.
Echinodermata	Organ-system	Radial	Coelomate	Absent	Complete	Present	Present	Water vascular system, radial symmetry.
Hemichordata	Organ-system	Bilateral	Coelomate	Absent	Complete	Present	Present	Worm-like with proboscis, collar and trunk.
Chordata	Organ-system	Bilateral	Coelomate	Present	Complete	Present	Present	Notochord, 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

CBSE Exam Tips, Important Questions & Common Mistakes to Avoid

Common Mistakes and Exam Tips

Common Pitfalls

Misunderstanding Classification: Students often confuse the levels of organization (cellular, tissue, organ) and their significance in classification.
Ignoring Symmetry Types: Failing to recognize the differences between radial and bilateral symmetry can lead to incorrect classifications.
Overlooking Coelom Types: Not distinguishing between coelomates, pseudocoelomates, and acoelomates can result in errors in identifying animal groups.
Confusing Digestive Systems: Misunderstanding the difference between incomplete and complete digestive systems can lead to incorrect answers regarding animal classifications.
Neglecting Distinctive Features: Students may forget to mention key features like the presence of notochord in chordates or water vascular systems in echinoderms.

Exam Tips

Review Key Features: Make a list of distinctive features for each phylum to aid in quick recall during exams.
Practice Matching Questions: Familiarize yourself with matching questions similar to those provided in exercises to improve speed and accuracy.
Understand Development Types: Be clear on the differences between direct and indirect development, as this is a common area of confusion.
Use Diagrams Effectively: Practice labeling diagrams of various animal groups to reinforce your understanding of their structures and functions.
Focus on Examples: Remember specific examples of animals within each phylum to help solidify your understanding and recall during exams.

CBSE Quiz & Practice Test – MCQs, True/False Questions with Solutions

Multiple Choice Questions

Arthropoda

Echinodermata

Mollusca

Chordata

Correct Answer: B

Solution:

Echinoderms possess a unique water vascular system used for locomotion and feeding.

Osteichthyes

Chondrichthyes

Amphibia

Reptilia

Correct Answer: B

Solution:

Class Chondrichthyes includes fishes with a cartilaginous endoskeleton.

Platyhelminthes

Aschelminthes

Annelida

Mollusca

Correct Answer: B

Solution:

Aschelminthes are bilaterally symmetrical, triploblastic, and pseudocoelomate animals.

Annelida

Aschelminthes

Platyhelminthes

Chordata

Correct Answer: B

Solution:

Aschelminthes, or roundworms, are pseudocoelomates, meaning their body cavity is not fully lined by mesoderm.

Annelida

Arthropoda

Echinodermata

Mollusca

Correct Answer: C

Solution:

Echinoderms are characterized by the presence of a water vascular system, which is used for locomotion, feeding, and respiration.

Mollusca

Echinodermata

Arthropoda

Chordata

Correct Answer: B

Solution:

Echinodermata is known for its unique water vascular system used for locomotion and feeding.

Arthropoda

Mollusca

Echinodermata

Chordata

Correct Answer: C

Solution:

Echinoderms possess a water vascular system, which is a distinctive feature of this phylum.

Taenia

Pleurobrachia

Ascaris

Nereis

Correct Answer: B

Solution:

Pleurobrachia is an example of a ctenophore, characterized by the presence of comb plates.

Aves

Reptilia

Amphibia

Mammalia

Correct Answer: B

Solution:

Reptiles generally have a three-chambered heart, but crocodiles, which are reptiles, have a four-chambered heart.

Mollusca

Annelida

Arthropoda

Chordata

Correct Answer: C

Solution:

Arthropoda is characterized by animals with jointed appendages.

Presence of scales

Presence of feathers

Presence of hair

Presence of gills

Correct Answer: C

Solution:

Mammals are unique in possessing hair, which is one of their distinguishing features.

Organ-system level

Cellular level

Tissue level

Organ level

Correct Answer: B

Solution:

Porifera includes multicellular animals which exhibit a cellular level of organization.

Aves

Reptilia

Amphibia

Mammalia

Correct Answer: B

Solution:

Reptiles generally have a three-chambered heart, but crocodiles have a four-chambered heart.

Presence of a notochord

Comb plates for locomotion

Jointed appendages

Spiny skin

Correct Answer: B

Solution:

Ctenophores are known for their comb plates, which are used for locomotion.

Presence of a notochord

Bilateral symmetry and acoelomate body

Radial symmetry and diploblastic

Segmented body and coelomate

Correct Answer: B

Solution:

Platyhelminthes are characterized by bilateral symmetry and an acoelomate body structure.

Amphibia

Reptilia

Aves

Cyclostomata

Correct Answer: C

Solution:

Aves, or birds, are characterized by a four-chambered heart and are homoiothermous, meaning they can maintain a constant body temperature.

Presence of hair

External ears or pinnae

Three-chambered heart

Viviparous reproduction

Correct Answer: C

Solution:

Mammals are characterized by having a four-chambered heart, not three. The other options are correct characteristics of mammals.

Osteichthyes

Chondrichthyes

Amphibia

Reptilia

Correct Answer: B

Solution:

Chondrichthyes, or cartilaginous fishes, have a cartilaginous endoskeleton and lack an operculum covering their gill slits.

Notochord present

Dorsal hollow nerve cord

Open circulatory system

Paired pharyngeal gill slits

Correct Answer: C

Solution:

Chordates are characterized by a closed circulatory system, not an open one.

Annelida

Aschelminthes

Mollusca

Echinodermata

Correct Answer: B

Solution:

Aschelminthes are pseudocoelomates, meaning they have a body cavity not fully lined by mesoderm.

Radial symmetry

Jointed appendages

Presence of a notochord

Bilateral symmetry

Correct Answer: B

Solution:

Arthropods are characterized by the presence of jointed appendages.

Annelida

Platyhelminthes

Aschelminthes

Chordata

Correct Answer: C

Solution:

Aschelminthes are pseudocoelomates, meaning they have a body cavity not entirely lined by mesoderm.

Amphibia

Reptilia

Chondrichthyes

Aves

Correct Answer: C

Solution:

Class Chondrichthyes includes marine animals with a cartilaginous endoskeleton, such as sharks and rays.

Reptilia

Amphibia

Aves

Mammalia

Correct Answer: C

Solution:

Aves, or birds, are characterized by the presence of feathers and are warm-blooded, allowing them to maintain a constant body temperature.

Platyhelminthes

Aschelminthes

Annelida

Chordata

Correct Answer: B

Solution:

Aschelminthes, also known as nematodes or roundworms, are characterized by a pseudocoelom and include both parasitic and non-parasitic species.

Osteichthyes

Amphibia

Chondrichthyes

Aves

Correct Answer: C

Solution:

Chondrichthyes are marine animals with a cartilaginous endoskeleton.

Porifera

Cnidaria

Chordata

Echinodermata

Correct Answer: C

Solution:

Phylum Chordata includes animals that possess a notochord either throughout or during early embryonic development.

Mollusca

Arthropoda

Annelida

Echinodermata

Correct Answer: B

Solution:

Arthropoda is characterized by having a body covered by a chitinous exoskeleton.

Cellular

Tissue

Organ

Organ-system

Correct Answer: A

Solution:

Sponges exhibit a cellular level of organization, where cells are arranged as loose aggregates.

Amphibia

Reptilia

Aves

Cyclostomata

Correct Answer: C

Solution:

Aves, or birds, have a completely four-chambered heart, which is a characteristic feature of this class.

Earthworm

Tapeworm

Roundworm

Jellyfish

Correct Answer: C

Solution:

Roundworms, or Aschelminthes, are pseudocoelomates, meaning they have a body cavity not entirely lined with mesoderm.

Echinodermata

Mollusca

Arthropoda

Chordata

Correct Answer: A

Solution:

Echinodermata is distinguished by a water vascular system and radial symmetry, which are not present in the other phyla listed.

Metameric segmentation

Pseudocoelomate body cavity

Closed circulatory system

Presence of nephridia

Correct Answer: B

Solution:

Annelids are coelomate, not pseudocoelomate.

Mollusca

Annelida

Arthropoda

Echinodermata

Correct Answer: C

Solution:

Arthropoda is characterized by a chitinous exoskeleton and jointed appendages, making it the largest phylum in the animal kingdom.

Porifera

Platyhelminthes

Aschelminthes

Annelida

Correct Answer: C

Solution:

Aschelminthes are pseudocoelomates, meaning they have a body cavity not fully lined with mesoderm.

Arthropoda

Mollusca

Echinodermata

Annelida

Correct Answer: B

Solution:

Mollusca is characterized by animals having a calcareous shell, a distinct head, muscular foot, and visceral hump.

Ascaris

Taenia

Earthworm

Planaria

Correct Answer: C

Solution:

Earthworms belong to the phylum Annelida, which are coelomates, meaning they have a true body cavity lined by mesoderm.

Presence of a notochord

Jointed appendages

Calcareous shell

Water vascular system

Correct Answer: C

Solution:

Molluscs are characterized by having a soft body usually covered by a calcareous shell.

Bilateral symmetry

Radial symmetry

Asymmetry

None of the above

Correct Answer: B

Solution:

Ctenophores are radially symmetrical organisms.

Amphibia

Reptilia

Aves

Cyclostomata

Correct Answer: C

Solution:

Aves (birds) have a heart with four chambers, which is a characteristic feature of this class.

Bilateral symmetry

Radial symmetry

Asymmetry

Spherical symmetry

Correct Answer: B

Solution:

Ctenophora exhibits radial symmetry, which means any plane passing through the central axis divides the organism into two identical halves.

Annelida

Arthropoda

Mollusca

Echinodermata

Correct Answer: B

Solution:

Arthropoda is the phylum known for jointed appendages and a chitinous exoskeleton, distinguishing it from the other phyla listed.

Porifera

Cnidaria

Chordata

Echinodermata

Correct Answer: C

Solution:

Phylum Chordata is characterized by the presence of a notochord at some stage of development. This is a key feature that distinguishes chordates from non-chordates.

Osteichthyes

Chondrichthyes

Amphibia

Reptilia

Correct Answer: B

Solution:

Chondrichthyes, or cartilaginous fishes, have a cartilaginous endoskeleton and separate gill slits without an operculum.

Platyhelminthes

Aschelminthes

Annelida

Porifera

Correct Answer: B

Solution:

Aschelminthes, also known as roundworms, are bilaterally symmetrical, triploblastic, and pseudocoelomate.

Platyhelminthes

Aschelminthes

Annelida

Mollusca

Correct Answer: B

Solution:

Aschelminthes, also known as roundworms, are pseudocoelomates and include both parasitic and non-parasitic species.

Hydra

Planaria

Amoeba

Sponges

Correct Answer: B

Solution:

Planaria, a member of the phylum Platyhelminthes, is triploblastic, having three germ layers.

Arthropoda

Mollusca

Annelida

Echinodermata

Correct Answer: B

Solution:

Mollusca is the phylum where animals have a body covered by a calcareous shell and a muscular foot.

Annelida

Platyhelminthes

Ctenophora

Aschelminthes

Correct Answer: A

Solution:

Annelids are metamerically segmented animals with a true coelom.

Ctenophora

Porifera

Platyhelminthes

Cnidaria

Correct Answer: C

Solution:

Platyhelminthes are bilaterally symmetrical and triploblastic animals.

Metameric segmentation

Jointed appendages

Coelomate body cavity

Closed circulatory system

Correct Answer: B

Solution:

Jointed appendages are a characteristic of the phylum Arthropoda, not Annelida. Annelids are known for their metameric segmentation, coelomate body cavity, and closed circulatory system.

Amphibia

Chondrichthyes

Osteichthyes

Reptilia

Correct Answer: B

Solution:

Chondrichthyes are marine animals with a cartilaginous endoskeleton, such as sharks and rays.

Chondrichthyes

Amphibia

Reptilia

Cyclostomata

Correct Answer: A

Solution:

In the class Chondrichthyes, the notochord persists throughout the life of the organism, unlike in other classes where it is replaced by a vertebral column.

Jointed appendages

Metameric segmentation

Radial symmetry

Pseudocoelom

Correct Answer: B

Solution:

Annelids exhibit metameric segmentation, meaning their bodies are divided into segments.

True or False

Correct Answer: False

Solution:

Echinoderms exhibit radial symmetry in their adult form, although their larvae are bilaterally symmetrical.

Correct Answer: False

Solution:

Arthropods have an open circulatory system.

Correct Answer: True

Solution:

Reptiles are poikilotherms and typically have a three-chambered heart, but crocodiles have a four-chambered heart.

Correct Answer: True

Solution:

Arthropods possess an open circulatory system where the blood is not confined to vessels.

Correct Answer: True

Solution:

Chordates are defined by the presence of a notochord at some stage in their life cycle.

Correct Answer: True

Solution:

Annelids are metamerically segmented animals with a true coelom.

Correct Answer: False

Solution:

Arthropods have an open circulatory system.

Correct Answer: True

Solution:

Ctenophores, also known as sea walnuts or comb jellies, are marine organisms that exhibit bioluminescence and have a tissue level of organization.

Correct Answer: True

Solution:

Platyhelminthes have an organ-system level of organization, as tissues are grouped into organs.

Correct Answer: False

Solution:

In some chordates, the notochord is present only during the embryonic stage.

Correct Answer: False

Solution:

Arthropods have an open circulatory system, not a closed one.

Correct Answer: False

Solution:

Molluscs have a soft body covered by a calcareous shell and are unsegmented.

Correct Answer: False

Solution:

Molluscs have an unsegmented body, which is covered by a calcareous shell.

Correct Answer: True

Solution:

Porifera includes multicellular animals which exhibit a cellular level of organization.

Correct Answer: False

Solution:

Ctenophores are radially symmetrical organisms, not bilaterally symmetrical.

Correct Answer: False

Solution:

Annelids are coelomate animals, meaning they have a true coelom.

Correct Answer: True

Solution:

Mammals are unique in possessing hair, which is one of their distinguishing features.

Correct Answer: True

Solution:

Annelids possess a closed circulatory system.

Correct Answer: True

Solution:

Ctenophores, commonly known as sea walnuts or comb jellies, are exclusively marine organisms.

Correct Answer: True

Solution:

Arthropods, the largest phylum of Animalia, are characterized by an open circulatory system and jointed appendages.

Correct Answer: True

Solution:

Platyhelminthes, also known as flatworms, are bilaterally symmetrical.

Correct Answer: True

Solution:

Cyclostomata are jawless vertebrates, such as lampreys and hagfish.

Correct Answer: False

Solution:

Ctenophores are radially symmetrical organisms.

Correct Answer: False

Solution:

Reptiles are poikilotherms, meaning they cannot maintain a constant body temperature.

Correct Answer: True

Solution:

One of the defining characteristics of chordates is the presence of a dorsal, hollow nerve cord.

Correct Answer: True

Solution:

Chordates possess a notochord either throughout or during early embryonic life, along with other features like a dorsal, hollow nerve cord.

Correct Answer: False

Solution:

Arthropods have an open circulatory system, where blood is not confined to vessels.

Correct Answer: False

Solution:

Members of the phylum Porifera exhibit a cellular level of organization, not a tissue level.

Correct Answer: True

Solution:

Annelids have a closed circulatory system, as well as being metamerically segmented and coelomate animals.

Correct Answer: True

Solution:

Animals in the phylum Platyhelminthes are characterized by having a dorso-ventrally flattened body and are acoelomate, meaning they lack a coelom.

Correct Answer: True

Solution:

Annelids have a body that is metamerically segmented and possess a true coelom.

Correct Answer: True

Solution:

Platyhelminthes, also known as flatworms, are acoelomate animals that have a dorsoventrally flattened body and exhibit bilateral symmetry.

Correct Answer: False

Solution:

Ctenophores are radially symmetrical, not bilaterally symmetrical.

Correct Answer: True

Solution:

Chordates are characterized by the presence of a dorsal, hollow nerve cord.

Correct Answer: True

Solution:

Phylum Chordata is characterized by the presence of a notochord, which is a mesodermally derived rod-like structure present at least during some stage of development.

Correct Answer: True

Solution:

Echinoderms possess a distinctive water vascular system.

Correct Answer: True

Solution:

While all vertebrates possess a notochord during embryonic development, not all chordates develop a vertebral column, making some chordates non-vertebrates.

Correct Answer: True

Solution:

Ctenophores, or comb jellies, have a tissue level of organisation.

Correct Answer: False

Solution:

Molluscs have an unsegmented body covered by a calcareous shell.

Correct Answer: True

Solution:

Bioluminescence is a well-marked property in ctenophores.

Correct Answer: False

Solution:

Ctenophores are known for their bioluminescence, but they reproduce only by sexual means.

Correct Answer: False

Solution:

Arthropods have an open circulatory system where blood is not confined to vessels.

Animal Kingdom

AI Learning Assistant

CBSE Learning Objectives – Key Concepts & Skills You Must Know

Learning Objectives

CBSE Revision Notes & Quick Summary for Last-Minute Study

Animal Kingdom

4.1 Basis of Classification

4.1.1 Levels of Organisation

4.2 Classification of Animals

Salient Features of Different Phyla

Examples of Animal Phyla

Important Diagrams

Figure 4.5: Examples of Porifera

Figure 4.8: Example of Ctenophora

Figure 4.9: Examples of Platyhelminthes

Figure 4.10: Example of Aschelminthes

Figure 4.11: Examples of Annelida

Figure 4.12: Examples of Arthropoda

Figure 4.13: Examples of Mollusca

CBSE Exam Tips, Important Questions & Common Mistakes to Avoid

Common Mistakes and Exam Tips

Common Pitfalls

Exam Tips

Multiple Choice Questions

Q1.Which of the following phyla is characterized by the presence of a water vascular system?

Correct Answer: B

Q2.Which class of animals is known for having a cartilaginous endoskeleton?

Correct Answer: B

Q3.Which phylum includes animals that are bilaterally symmetrical, triploblastic, and pseudocoelomate?

Correct Answer: B

Q4.Which of the following animals is an example of a pseudocoelomate?

Correct Answer: B

Q5.In which phylum do animals possess a water vascular system?

Correct Answer: C

Q6.Which phylum is known for its members having a water vascular system?

Correct Answer: B

Q7.Which phylum includes animals with a water vascular system?

Correct Answer: C

Q8.Which of the following animals is an example of a member of the phylum Ctenophora?

Correct Answer: B

Q9.Which class of vertebrates is known for having a three-chambered heart, except in one member where it is four-chambered?

Correct Answer: B

Q10.Which phylum includes animals that are known for their jointed appendages?

Correct Answer: C

Q11.Which of the following is a characteristic feature of mammals?

Correct Answer: C

Q12.What is the level of organization in animals belonging to the phylum Porifera?

Correct Answer: B

Q13.Which class of animals is known for having a three-chambered heart, except for one member with a four-chambered heart?

Correct Answer: B

Q14.What is the primary characteristic feature of the phylum Ctenophora?

Correct Answer: B

Q15.Which of the following features is characteristic of the phylum Platyhelminthes?

Correct Answer: B

Q16.Which class of vertebrates is known for having a four-chambered heart and being homoiothermous?

Correct Answer: C

Q17.Which of the following features is NOT a characteristic of mammals?

Correct Answer: C

Q18.Which class of vertebrates is characterized by the presence of a cartilaginous endoskeleton and the absence of an operculum?

Correct Answer: B

Q19.Which of the following features is NOT a characteristic of the phylum Chordata?

Correct Answer: C

Q20.Which of the following phyla is characterized by the presence of a pseudocoelom?

Correct Answer: B

Q21.Which of the following features is common to all members of the phylum Arthropoda?

Correct Answer: B

Q22.Which of the following phyla includes animals with a pseudocoelom?

Correct Answer: C

Q23.Which of the following classes of vertebrates is characterized by the presence of a cartilaginous endoskeleton and is marine?

Correct Answer: C

Q24.Which class of vertebrates is characterized by the presence of feathers and the ability to maintain a constant body temperature?

Correct Answer: C

Q25.Which phylum is characterized by animals having a pseudocoelom and includes both parasitic and non-parasitic species?

Correct Answer: B

Q26.Which class of vertebrates is characterized by having a cartilaginous endoskeleton?

Correct Answer: C

Q27.Which phylum is characterized by the presence of a notochord during some stage of development?

Correct Answer: C

Q28.Which phylum is characterized by having a body covered by a chitinous exoskeleton?

Correct Answer: B