NCERT Solutions for Class 7 Science Chapter 2
Important NCERT Questions
7th Chapter 2 Nutrition in Animals
NCERT Books for Session 2022-2023
CBSE Board and State Board
Questions No: 13
Can we survive only on raw, leafy vegetables/grass? Discuss.
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Raw leafy vegetables and grass are rich in cellulose, a type of carbohydrate. Many animals, including humans, cannot digest cellulose, because they do not have enzymes and certain type of bacteria which can digest cellulose. We cannot survive by taking vegetables in raw form. That’s why we boil or cook vegetables which breaks down cellulose into simple carbohydrates. We can only survive by taking in vegetables in boiled/cooked form.
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Relying solely on raw, leafy vegetables or grass for sustenance poses challenges in meeting essential nutritional needs for humans over the long term.
Challenges:
1. Nutritional Deficiency: While these vegetables contain vitamins and minerals, they lack adequate amounts of proteins and fats essential for bodily functions.
2. Protein Insufficiency: Raw leafy vegetables and grass generally lack complete proteins vital for tissue repair and growth.
3. Caloric Deficiency: Their low calorie content makes it hard to meet the body’s energy requirements.
4. Digestive Issues: Some raw vegetables or grass might be hard to digest, causing gastrointestinal discomfort.
5. Limited Nutrient Diversity: A diet restricted to these sources lacks the diverse nutrients found in a balanced diet, potentially leading to deficiencies in vital nutrients.
Possible Outcomes:
– Malnutrition: Relying solely on these sources may lead to malnutrition due to inadequate essential nutrients.
– Health Complications: Long-term deficiency in key nutrients can cause weakness, fatigue, weakened immunity, and developmental issues.
Conclusion:
While raw leafy vegetables and grass offer certain nutrients, solely depending on them may result in nutritional deficiencies and health problems. A balanced diet encompassing various food groups is essential for fulfilling nutritional needs and maintaining overall health.