Test: Food and its Components - Class 6 MCQ

Animals are classified based on their food habit, namely herbivore, carnivore, and omnivore. Both X and Y could be herbivores and Z could be carnivore whose population declines as it does not prey on both X and Y is the incorrect statement. Animals that feed on other animals are called carnivore, animals that feed on plants are called herbivore and animals that feed on both are called omnivore.

In the given Venn diagram X, V and Z represent vitamin D, vitamin E or vitamin A and vitamin K respectively. Deficiency of vitamin A causes night blindness and deficiency of vitamin C causes scurvy. Pellagra is caused by the deficiency of vitamin B3. Vitamin B is a group of eight vitamins (i.e., B₁ B₂ B₃ B5, B₆, B₇, B₉ and B₁₂ and is therefore known as vitamin B-complex.

Foods that are rich in minerals and vitamins are referred to as protective foods such as fruits and vegetables. Foods that provide energy to do physical activities are carbohydrates and fats such as starchy vegetables, grains, rice, bread and cereals. In the given flow chart, X, Y and Z refer to carbohydrate or fat, vitamin and mineral, respectively. Hence, consumption of excess fat can lead to obesity and heart-related problems.

Nutrients and their functions/deficiency symptoms:

1. Vitamin K:

   • Function: Helps in blood clotting.
   • Deficiency Symptom: Can lead to excessive bleeding or haemorrhage.
   • Match: P - (iii) - (b).

2. Iodine:

   • Function: Essential for the normal functioning of the thyroid glands (production of thyroid hormones).
   • Deficiency Symptom: Leads to goitre (swelling in the neck due to an enlarged thyroid gland).
   • Match: Q - (i) - (c).

3. Iron:

   • Function: Required for haemoglobin formation, which is crucial for transporting oxygen in the blood.
   • Deficiency Symptom: Leads to anaemia (low red blood cell count or haemoglobin).
   • Match: R - (iv) - (a).

4. Vitamin A:

   • Function: Maintains normal vision and is essential for eye health.
   • Deficiency Symptom: Leads to night blindness (difficulty seeing in low light or darkness).
   • Match: S - (ii) - (d).

Option A is the correct answer, as it aligns with the above matches.

According to the given dichotomous key P, Q, R and S could be glucose, cellulose, calcium and iron respectively. Goitre is caused by a deficiency of iodine. Cellulose is a complex carbohydrate that occurs in the cell wall of plant cells and plant fibres.