- 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.
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CBSE
Class–VII | CHAPTER – 1 Integers | NMMS
Revision Notes à Click
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Tracing
Changes Through a Thousand Years | NMMS Revision Notes | Class 7 | Social à Click
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New
Kings and Kingdoms | NMMS Revision Notes | Class 7 | Social à Click Here
The
Delhi Sultanate | NMMS Revision Notes | Class 7 Social à Click
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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
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Devotional
Paths to the Divine | NMMS Revision Notes | Class 7 Social à Click
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The
Making of Regional Cultures | NMMS Revision Notes | Class 7 Social à Click
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Eighteenth
Century Political Formations | NMMS Revision Notes | Class 7 Social à Click
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Environment
| NMMS Revision Notes | Class 7 Social à Click
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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 |
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Water
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Human
Environment Interactions the Tropical | NMMS Revison Notes | Class 7 Social à Click
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Life
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On
Equality | NMMS Revision Notes | Class 7 Social à Click Here
How
the State Government Works | NMMS Revision Notes | Class 7 Social à Click
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Role
of the Government in Health | NMMS Revision Notes | Class 7 Social à Click
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Growing
up as Boys and Girls | NMMS Revision Notes | Class 7 Social à Click
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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
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Heat |
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Acids
Bases And Salts | NMMS Revision Notes | Class 7 Science à Click Here
Physical
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Respiration
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Transportation
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Force
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Reproduction
In Plants | NMMS Revision Notes | Class 7 Science à Click Here
Motion
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Electric
Current and its Effects | NMMS Revision Notes | Class 7 Science à Click
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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
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From
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Ruling
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Tribals
Dikus and Vision of Golden Age | NMMS Revision Notes | Class 8 Social à Click
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When
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Weavers
Iron Smelters and Factory Owners | NMMS Revision Notes | Class 8 Social à Click
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Civilising
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Women
Caste and Reform | NMMS Revision Notes | Class 8 Social à Click Here