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Digestion and Absorption

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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 dental disease characterized by mottling of teeth is due to the presence of a certain chemical element in drinking water. Which of the following is that element?
    1. mercury
    2. chlorine
    3. fluorine
    4. boron
Correct Option: C

The excess of fluorine in water causes a condition called fluorosis, which is identified by mottling of teeth (yellowish streaks) and abnormal bones liable to fracture etc.


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