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Structural Organisation in Animals

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Advanced Zoology

Animal Kingdom
Structural Organisation in Animals
Digestion and Absorption
Breathing and Exchange of Gases
Body Fluids and Circulation
Excretory Products and their Elimination
Locomotion and Movement
Neural Control and Coordination
Chemical Coordination and Integration
Human Reproduction
Human Health and Disease
Biotechnology Principles and Processes
Biomolecules (Zoology)
Evolution (Zoology)
Biotechnology and its Applications
Reproductive Health
  1. One very special feature in the earthworm Pheretima is that
    1. fertilisation for eggs occurs inside the body
    2. the typhlosole greatly increases the effective absorption area of the digested food in the intestine
    3. the S-shaped setae embedded in the integument are the defensive weapons used against the enemies
    4. it has a long dorsal tubular heart
Correct Option: B

The intestine of an earthworm has a peculiar fold of tissue that forms a pocket in the intestine that is visible when viewing a cross section. This space, which runs almost the whole length of the body dorsally is known as the typhlosole and it serves to increase the surface area of the intestine for absorption.


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