Nutrition in Animals | NMMS Revision Notes | Class 7 Science

  

• Classification based on Eating Habits:
  (i) Herbivorous: Animals that eat plants or plant products. Example: cow, sheep, goat, deer, elephant, kangaroo, giraffe, etc.
  (ii) Carnivorous: Animals that eat only flesh of other animals. They never eat plants. Example: tiger, lizard, lion, etc.
  (iii) Omnivorous: Animals consume plants as well as other animals as their food. Example: bear, dog, human being, etc.
  (iv) Parasites: Organisms that obtain their food from other animals either by living inside (endoparasites) or outside (ectoparasites) their body. Example: tapeworm and roundworm (inside body), tick and lice (outside body).(v) Scavengers: Animals which feed on the remains of dead animals preyed by predators. Example: vulture, crows, jackal, etc.
   
• Animal nutrition includes nutrient requirement, mode of intake of food and its utilisation in the body.
   
• The human digestive system consists of the alimentary canal and secretory glands. It consists of
  (i) buccal cavity,
  (ii) oesophagus,
  (iii) stomach,
  (iv) small intestine,
  (v) large intestine ending in rectum
  (vi) anus.
   
• The main digestive glands which secrete digestive juices are
  (i) the salivary glands,
  (ii) the liver and
  (iii) the pancreas.
   
• The stomach wall and the wall of the small intestine also secrete digestive juices.
• The modes of feeding vary in different organisms.
• Nutrition is a complex process involving:
  (i) ingestion,
  (ii) digestion,
  (iii) absorption,
  (a) assimilation and
  (b) egestion.
   
• Digestion of carbohydrates, like starch, begins in the buccal cavity. The digestion of protein starts in the stomach. The bile secreted from the liver, the pancreatic juice from the pancreas and the digestive juice from the intestinal wall complete the digestion of all components of food in the small intestine. The digested food is absorbed in the blood vessels from the small intestine.
• The absorbed substances are transported to different parts of the body.  Water and some salts are absorbed from the undigested food in the large intestine.
• The undigested and unabsorbed residues are expelled out of the body as faeces through the anus.
• The grazing animals like cows, buffaloes and deer are known as ruminants. They quickly ingest, swallow their leafy food and store it in  the rumen. Later, the food returns to the mouth and the animal chews it peacefully.
   
• Amoeba ingests its food with the help of its false feet or pseudopodia.  The food is digested in the food vacuole. It pushes out finger-like pseudopodia which engulf the prey.

For More :-

CBSE Class–VII  | CHAPTER – 1 Integers |  NMMS  Revision Notes  à Click Here

Tracing Changes Through a Thousand Years | NMMS Revision Notes | Class 7 | Social  à Click Here

New Kings and Kingdoms | NMMS Revision Notes | Class 7 | Social  à Click Here

The Delhi Sultanate | NMMS Revision Notes | Class 7 Social à Click Here

The Mughal Empire | NMMS Revision Notes | Class 7 Social à Click Here

Tribes Nomads and Settled Communities | NMMS Revision Notes | Class 7 Social à Click Here

Devotional Paths to the Divine | NMMS Revision Notes | Class 7 Social à Click Here

The Making of Regional Cultures | NMMS Revision Notes | Class 7 Social à Click Here

Eighteenth Century Political Formations | NMMS Revision Notes | Class 7 Social à Click Here

Environment | NMMS Revision Notes | Class 7 Social à Click Here

Inside Our Earth | NMMS Revision Notes | Class 7 Social à Click Here

Our Changing Earth | NMMS Revision Notes | Class 7 Social à Click Here

Air | NMMS Revision Notes | Class 7 Social  à Click Here

Water | NMMS Revision Notes | Class 7 Social à Click Here

Human Environment Interactions the Tropical | NMMS Revison Notes | Class 7 Social à Click Here

Life in the Deserts | NMMS Revision Notes | Class 7 Social à Click Here

On Equality | NMMS Revision Notes | Class 7 Social à Click Here

How the State Government Works | NMMS Revision Notes | Class 7 Social à Click Here

Role of the Government in Health | NMMS Revision Notes | Class 7 Social à Click Here

Growing up as Boys and Girls | NMMS Revision Notes | Class 7 Social à Click Here

Women Change the World | NMMS Revision Notes | Class 7 Social à Click Here

Understanding Media | NMMS Revision Notes | Class 7 Social à Click Here

Markets Around Us | NMMS Revision Notes | Class 7 Social à Click Here

A Shirt in the Market | NMMS Revision Notes | Class 7 Social à Click Here

Nutrition in Plants | NMMS Revision Notes | Class 7 Science à Click Here

Nutrition in Animals | NMMS Revision Notes | Class 7 Science à Click Here

Heat | NMMS Revision Notes | Class 7 Science à Click Here

Acids Bases And Salts | NMMS Revision Notes | Class 7 Science à Click Here

Physical And Chemical Changes | NMMS Revision Notes | Class 7 Science  à Click Here

Respiration In Organisms | NMMS Revision Notes | Class 7 Science à Click Here     

Transportation in Animals and Plants | NMMS Revision Notes | Class 7 Science à Click Here

Force and Pressure | NMMS Quick  Revision Notes | Class: 8 Physics à Click Here

Reproduction In Plants | NMMS Revision Notes | Class 7 Science à Click Here

Motion And Time | NMMS Revision Notes | Class 7 Science à Click Here

Electric Current and its Effects | NMMS Revision Notes | Class 7 Science à Click Here

Light | NMMS Revision Notes | Class 7 Science à Click Here

Waste Water Story | NMMS Revision Notes | Class 7 Science à Click Here

How When and Where | NMMS Revision Notes | Class 8 Social à Click Here

From Trade to Territory | NMMS Revision Notes | Class 8 Social à Click Here

Ruling the Countryside | NMMS Revision Notes | Class 8 Social à Click Here

Tribals Dikus and Vision of Golden Age | NMMS Revision Notes | Class 8 Social à Click Here

When People Rebel | NMMS Revision Notes | Class 8 Social à Click Here

Weavers Iron Smelters and Factory Owners | NMMS Revision Notes | Class 8 Social à Click Here

Civilising the Native Educating the Nation | NMMS Revision Notes | Class 8 Social à Click Here

Women Caste and Reform | NMMS Revision Notes | Class 8 Social à Click Here