NCERT Solutions for Class 11 Biology Chapter 16

NCERT Solutions for Class 11 Biology Chapter 16 Digestion and Absorption to Study online or free to download in PDF. Download NCERT Solutions in updated format for the this academic session.


NCERT Solutions for Class 11 Biology Chapter 16

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Digestion and Absorption: Solutions




11 Biology Chapter 16 Question Answers

NCERT Solutions for Class 11 Biology Chapter 16 Digestion and Absorption
NCERT Solutions for Class 11 Biology Chapter 16 in PDF




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Important Notes on Digestion and Absorption

Different Types of Teeth
  1. Canine – for tearing
  2. Incisors – for cutting
  3. Premolars – for grinding
  4. Molars – for churning and grinding
Key Points
  • Peristalsis: The involuntary movement of the gut by which the food bolus is pushed forward.
  • Deglutition: The process of swallowing of food bolus. It is partly voluntary and partly involuntary.
  • Ruminants: The herbivores animals (e.g., cow, buffalo etc.) which have symbiotic bacteria in the human of their stomach which synthesize enzymes to hydrolyse cellulose into monosaccharides.
  • Diarrhoea: The abnormal frequent discharge of semisolid or fluid faecal matter from the bowel.
  • Vomiting: The ejection of stomach contents through the mouth, caused by antiperistalsis.
  • Dysentery: Frequent watery stools often with blood and mucus and with pain, fever and causes dehydration.



More to Know
  • Chyme: The semifluid mass into which food is converted by gastric secretion and which passes from the stomach into the small intestine.
  • Gastric: Anything associated with stomach is given a prefix – gastric.
  • Proenzyme: The inactive forms of enzymes.
  • Sphincter: A flap like structure at various junctions of the alimentary canal which facilities one way traffic in the alimentary canal.
  • Bolus: The masticated food mixed with saliva.
  • Digestion: The process in alimentary canal by which the complex food is converted mechanically and biochemically into simple substances suitable for absorption and assimilation.
  • Food: A substance which on taken and digested in the body provides material for growth, repair, energy, and reproduction, resistance from disease or regulation of body processes.
  • Thecodont: The teeth embedded in the sockets of the jaw bone, e.g., in mammals.



Basic Steps of Holozoic Nutrition
  1. Ingestion: Intake of food.
  2. Digestion: Breaking down of complex organic food materials into simpler, smaller soluble molecules.
  3. Absorption and assimilation: Absorption of digested food into blood or lymph and its use in the body cells for synthesis of complex components.
  4. Egestion: Elimination of undigested food as faeces