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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. A piece of bone such as femur of frog if kept in dilute HCl for about a week will
    1. assume black colour
    2. shrink in size
    3. turn flexible
    4. crack into pieces
Correct Option: C

When a bone is kept in dilute acids like HCl for a few days, the Ca2+ salts get dissolved leaving only the soft and flexible organic matrix. This process is called decalcification. If a bone is kept in KOH it remains unaffected and only the surrounding muscles and connective tissues get dissolved so that the bone now appears clean.


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