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Class 6 Science: Food & Nutrition

Major nutrients (carbohydrates, fats, proteins, vitamins, minerals), dietary fiber, balanced diet, and nutrient deficiency diseases.

Class 6 Science 5 Generated Practice Exercises NCERT Exercise Solutions

⚡ Key Formulas & Core Relations for Food & Nutrition

Energy density: 1g Fat ≈ 9 kcal, 1g Carbohydrate ≈ 4 kcal, 1g Protein ≈ 4 kcal
Iodine Test: Starch + Dilute Iodine -> Blue-black color
Biuret Test: Protein + CuSO4 + NaOH -> Violet color

NCERT Textbook Exercise Solutions

1 Solutions
NCERT Exercise - Q1

Textbook Exercise Problem

Name the major nutrients in our food and their primary physiological functions.

Step-by-Step Verified Solution:

  1. Step 1: Carbohydrates and Fats: Provide energy to the body for physical activities and basal metabolism.
  2. Step 2: Proteins: Essential for muscle building, growth, tissue repair, and enzymatic synthesis.
  3. Step 3: Vitamins and Minerals: Protect the body against diseases and maintain organ function.
  4. Step 4: Dietary fiber (Roughage) and Water: Aid digestion, eliminate waste, and prevent constipation.
Final Answer: Carbohydrates, Fats, Proteins, Vitamins, Minerals, Roughage, and Water.
Key Concept / Exam Strategy: A balanced diet must supply all essential nutrients in proper proportion.

5 AI-Generated Chapter Exercises (Foundation to HOTS)

5 Problems with Full Steps
Generated Exercise #1 Foundation
Question: Match the deficiency diseases with their causative vitamins/minerals: (a) Scurvy, (b) Night Blindness, (c) Goitre, (d) Rickets.
Core Concept Tested: Vitamin and mineral deficiency syndromes
Mentor Hint: Scurvy is bleeding gums; Goitre is swollen neck gland.

Step-by-Step Solution:

  1. Step 1: Scurvy is caused by deficiency of Vitamin C.
  2. Step 2: Night Blindness is caused by deficiency of Vitamin A.
  3. Step 3: Goitre is caused by deficiency of Iodine.
  4. Step 4: Rickets (weak soft bones) is caused by deficiency of Vitamin D.
Verified Answer: (a) Vitamin C, (b) Vitamin A, (c) Iodine, (d) Vitamin D
Generated Exercise #2 Intermediate
Question: Describe the laboratory test to confirm the presence of fats in a given food sample.
Core Concept Tested: Paper spot test for dietary lipids/fats
Mentor Hint: Rub sample on paper and inspect under light.

Step-by-Step Solution:

  1. Step 1: Wrap a small quantity of the food item in a clean piece of white paper and crush it gently.
  2. Step 2: Straighten the paper and allow it to dry if water was present.
  3. Step 3: Hold the paper against a light source. An oily translucent patch confirms the presence of fat.
Verified Answer: Appearance of a permanent translucent oily patch on paper confirms presence of fat.
Generated Exercise #3 Intermediate
Question: Why are fats called concentrated energy reserves compared to carbohydrates?
Core Concept Tested: Thermodynamic energy yield of lipids vs carbohydrates
Mentor Hint: Compare kcal produced per gram.

Step-by-Step Solution:

  1. Step 1: One gram of fat yields approximately 9 kcal of metabolic energy.
  2. Step 2: One gram of carbohydrate yields only 4 kcal of energy.
  3. Step 3: Thus, fats provide more than double the energy per unit weight compared to carbs.
Verified Answer: Fats provide ~9 kcal/g, more than twice the energy of carbohydrates (~4 kcal/g).
Generated Exercise #4 JEE-NEET Foundation
Question: Which chemical reagents are used to test for proteins in a food solution, and what color change indicates a positive result?
Core Concept Tested: Biuret test chemical reagents and optical indicator
Mentor Hint: Copper sulfate and caustic soda (sodium hydroxide).

Step-by-Step Solution:

  1. Step 1: Reagents required: 2 drops of Copper Sulfate (CuSO4) solution and 10 drops of Caustic Soda (NaOH) solution.
  2. Step 2: Mix thoroughly with the food suspension in a test tube.
  3. Step 3: If proteins are present, peptide bonds complex with copper ions, producing a distinct violet/purple color.
Verified Answer: CuSO4 and NaOH solutions; positive result is indicated by a violet/purple color.
Generated Exercise #5 Advanced HOTS
Question: A child exhibits stunted growth, swollen belly, thinning of limbs, and dry scaly skin. Diagnose the nutritional deficiency condition and state its preventive remedy.
Core Concept Tested: Protein Energy Malnutrition (Kwashiorkor vs Marasmus)
Mentor Hint: Kwashiorkor is severe protein deficiency with edema/swollen belly.

Step-by-Step Solution:

  1. Step 1: Diagnosis: Kwashiorkor (a severe form of Protein-Energy Malnutrition).
  2. Step 2: Cause: Severe protein deficiency in diet despite adequate carbohydrate intake.
  3. Step 3: Remedy: Enrich diet with high-protein food sources such as milk, eggs, pulses, soy, and fish.
Verified Answer: Condition: Kwashiorkor. Remedy: Protein-rich diet (pulses, milk, eggs, soybeans).