Class 6 Science Chapter 1 Variety of Food, Food, Modes of Nutrition, Food Habits, Sources of Food, Classes of Nutrients (For CBSE, ICSE, IAS, NET, NRA 2022)

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Variety of Food


  • It is defined as the nutritious substance that is taken to grow and perform daily work.
  • It is primarily obtained from plants and animals.
  • Food variety refers to the consumption of a mixture of foods from the food range i.e.. , vegetables, fruit, cereals, meat, fish, and dairy products.
  • It is important to go for the food variety because of the difference in the nutritional content of each food.
  • Basic food groups:
    • Vegetables and legumes.
    • Fruits.
    • Breads, cereals, rice, pasta, noodles, and other grains.
    • Lean meat, fish, poultry, eggs, nuts, and legumes.

Modes of Nutrition

Modes of Nutrition


  • They create their own nutrients and energy.
  • Some examples include Algae, Maize plant, Wheat, Seaweed, Phytoplankton, etc.
  • Energy is created through a process called photosynthesis.
  • Two types of autotrophic nutrition:
    • Chemosynthesis
    • Photosynthesis
Diagram Showing Photosynthesis


  • They eat other plants or animals for energy and nutrients.
  • They cannot produce their own foods.
  • Heterotrophs are primary, secondary, and tertiary consumers in the food chain.
  • Heterotrophic nutrition can be one of three types:
    • Holozoic
    • Saprophytic
    • Parasitic
Division Based on Food Habits
  • They eat only grass and plant products.
  • Some of the examples are Cow, Elephant, Camel, Deer, Goat, etc.
  • These animals eat flesh of other animals.
  • Some of the examples are Lion, jackal, frog, tiger, etc.
  • They eat both plants and animals.
  • Some of the examples are Crow, monkey, bear, human, etc.

Those animals who eat flesh of dead animals.

Food Ingredients

  • Ingredients are the materials used for preparing food.
  • For example, while preparing tea, tea-leaves, milk and sugar are used.
  • Chicken curry is prepared using spices, salt, and onions so spices, salt and onions are the ingredients.

Sources of Food


  • Rice
  • Wheat
  • Vegetables
  • Fruits, etc.


  • Milk
  • Eggs
  • Meat
  • Honey
  • Fish, etc.

Five Major Food Groups

  • Fruits for example guava, mango, banana, orange, etc.
  • Vegetables for example cabbage, cauliflower, spinach, etc.
  • Dairy products for example Butter, Cheese, etc.
  • Cereal, legumes for example Rice, wheat, corn are cereals and Chickpeas, Green peas are legumes.

Main Classes of Nutrients That the Body Needs

  • Carbohydrates
  • Proteins
  • Fats
  • Vitamins
  • Minerals
  • Fibre
  • Water

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