Important Questions for Class 11 Biology- Animal Kingdom

There are a number of living organisms in the world. The animal kingdom includes the largest variety of species ranging from simplest to most complex forms. It includes the following phyla:

  • Phylum Porifera
  • Phylum Coelenterata
  • Phylum Platyhelminthes
  • Phylum Nematoda
  • Phylum Annelida
  • Phylum Arthropoda
  • Phylum Mollusca
  • Phylum Echinodermata
  • Phylum Protochordata
  • Phylum Vertebrata


Q.1. In which phylum do the adults exhibit radial symmetry and larva exhibit bilateral symmetry?
A.1. Echinodermata
Q.2. How are pneumatic bones and air sacs important in aves?
A.2. Pneumatic bones are hollow filled with air which helps them in flying. Air sacs are the air reservoirs. They also regulate body temperature and act as cooling devices.
Q.3. Match the following:

Amphibia Air Bladder
Mammals Cartilaginous Notochord
Chondrichthyes Mammary Glands
Osteichthyes Pneumatic bones
Cyclostomata Dual Habitat
Aves Sucking and circular mouth without jaws

Amphibia- Dual Habitat Mammals- Mammary Glands Chondrichthyes- Cartilaginous notochord Osteichthyes- Air bladder Cyclostomata- Sucking and circular mouth without jaws Aves- Pneumatic bones
Q.4. Differentiate between diploblastic and triploblastic animals.

Diploblastic Animals Triploblastic Animals
Diploblastic animals are those in which cells are arranged in two embryonic layers, internal endoderm, external ectoderm. For eg., coelenterates. While triploblastic animals are those that have a mesoderm along with the ectoderm and endoderm. For eg., chordates

Q.5. Provide a technical term for the following:

  1. Blood filled cavity in arthropods
  2. A stinging organ of jellyfish
  3. Free-floating form of Cnidaria
  4. Lateral appendages in aquatic annelids


  1. Haemocoel
  2. Nematocytes
  3. Medusa
  4. Parapodia

Q.6. Give an example of:

  1. An oviparous mammal
  2. Roundworm
  3. A limbless reptile
  4. Fish possessing poison sting


  1. Duck-billed Platypus
  2. Ascaris
  3. Ichthyophis
  4. Trygon

Q.7. Mention the role of the radula in Molluscs.
A.7. The radula helps in scraping and scratching the food and creates depressions in the rocks. Molluscs use rocks as their habitat.
Q.8. What do you understand by metagenesis? Give an example.
A.8. Metagenesis is the phenomenon in which one generation of plants and animals reproduces asexually followed by sexually reproducing generation. For eg., Coelenterates
Q.9. What is bioluminescence? Give an example.
A.9. The production and emission of light by a living organism is known as bioluminescence. It is widely seen in marine animals, in some fungi, and a few terrestrial invertebrates. Jellyfish and fireflies exhibit this phenomenon.
Q.10. How do endoparasites survive inside the body of the host?
A.10. The endoparasites have the following features which help them to survive inside the body of the host:

  • Anaerobic respiration.
  • Exchange of gases through body surface.
  • They possess an additional organ for attachment.
  • Well-developed reproductive organs.
  • A thick body covering is present.
  • They have no locomotory organs.
  • Tapeworms do not have a digestive system and absorb the digested food of the host.

Q.11. Mention two similarities between aves and mammals.
A.11. Both aves and mammals are homeotherms, i.e., warm-blooded. They have a four-chambered heart.
Q.12. What is the function of feathers in birds?
A.12. Feathers play the following roles:

  • The feathers help in maintaining body temperatures.
  • They provide airfoil shape for wings to help in flight.
  • They act as the secondary sex characters in both the sexes. The colour and markings help in attracting mates.

Q.13. Name the classes of vertebrates with two, three and four-chambered hearts.
A.13. Two-chambered hearts– Fish One atria and one ventricle is present. The oxygenated and deoxygenated blood mixes together.
Three-chambered hearts- Amphibians Two auricles and one ventricle
Four-chambered hearts- Mammals Two auricles and two ventricles.
Q.14. Complete the following:

Phylum/Class Excretory Organ Circulatory Organ Respiratory Organ
Arthropoda Lungs/Gills/Tracheal system
Nephridia Closed
Metanephridia Open Skin/Parapodia
Amphibia Closed Lungs


Phylum/Class Excretory Organ Circulatory Organ Respiratory Organ
Arthropoda Malpighian tubules Open Lungs/gills/trachea
Annelida Nephridia Closed Skin
Mollusc Metanephridia Open Skin/Parapodia
Amphibia Closed Closed Lungs and Skin

Q.15. Differentiate between open and closed circulatory system.

Open Circulatory System Closed Circulatory System
Blood flows through open spaces called lacunae. Blood flows through closed vessels.
Circulation takes a longer time. Circulation takes a shorter time.
Haemocoel is present. Haemocoel is absent.
The blood flows with a slow velocity. The blood flows with a higher velocity.
Internal organs are in direct contact with blood. Internal organs are in direct contact with blood.
Blood flow cannot be regulated. Blood flow can be regulated.
Supply and removal of materials is slow. Supply and removal of materials is rapid.
Materials are exchanged between blood and lacunae. Materials are exchanged between blood and tissues through sinuses.

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