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Olympiad (Class 6) Biology — practice by topic

Browse 30 questions across 3 Biology topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Biology topics

Biology (30)Components of Food (30)Olympiad Science (30)

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A student drops iodine on a potato slice and it turns blue black. The slice has:Read the answer and worked solution →Cooked dal shaken with the test solution turns violet. The dal contains:Read the answer and worked solution →A groundnut crushed in paper leaves an oily patch. The groundnut contains:Read the answer and worked solution →A boy eats rice before a long cycle ride for quick energy. Rice is rich in:Read the answer and worked solution →

Worked practice questions

A student drops iodine on a potato slice and it turns blue black. The slice has:

  1. Starch
  2. Fibre
  3. Water
  4. Fats
Show answer and solution

Correct answer: A. Starch

1. Iodine gives a blue black colour only with starch. 2. The potato slice showed that colour. 3. So the slice contains starch. _Source: syllabus Science Class VI, Chapter 2, Components of Food._

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Cooked dal shaken with the test solution turns violet. The dal contains:

  1. Minerals
  2. Protein
  3. Roughage
  4. Vitamins
Show answer and solution

Correct answer: B. Protein

1. A violet colour in the test tube marks one nutrient. 2. That nutrient is protein. 3. So the dal contains protein. _Source: syllabus Science Class VI, Chapter 2, Components of Food._

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A groundnut crushed in paper leaves an oily patch. The groundnut contains:

  1. Fats
  2. Water
  3. Salt
  4. Iron
Show answer and solution

Correct answer: A. Fats

1. An oily patch left on paper is the test for fat. 2. The patch stayed even after the paper dried. 3. So the groundnut contains fats. _Source: syllabus Science Class VI, Chapter 2, Components of Food._

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How to practise

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