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Questions and Answers
What is the main source of energy obtained from cereals?
Which nutrients are considered macronutrients for plants?
Why are biological control methods preferred for protecting crops over chemical pesticides?
Which nutrients are present in proteins according to the text?
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What is the significant component of chlorophyll as stated in the text?
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Why is option (c) considered to give the most benefits in crop production?
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How can NCERT Solutions for Class 9 Science Chapter 15 help students?
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What is the primary purpose of providing NCERT Solutions for Class 9 Science Chapter 15?
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Who prepares the NCERT Solutions for Class 9 Science Chapter 15?
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Study Notes
Improvement in Food Resources
- Cereals are the source of carbohydrates and provide energy, while pulses provide protein for growth and development.
- Fruits and vegetables are rich in minerals, vitamins, carbohydrates, proteins, and fats, essential for overall development.
Factors Affecting Crop Production
- Biotic factors (living organisms) and abiotic factors (non-living factors) affect crop production.
- Desirable agronomic characteristics for crop improvement include: • High yield • Disease resistance • Pest resistance • Drought tolerance • Lodging resistance
Macronutrients
- Macronutrients are essential elements required by plants in large quantities.
- Macronutrients include: • Nitrogen (N) • Phosphorus (P) • Sulphur (S) • Calcium (Ca) • Magnesium (Mg)
- These macronutrients are necessary for plant growth and are present in: • Proteins • Cell walls • Chlorophyll
Plant Nutrition
- Plants require 16 basic essential nutrients to grow.
- Carbon and Oxygen are supplied by water, while the remaining nutrients are supplied through the soil.
Soil Fertility
- Manure and fertilizers are used to maintain soil fertility.
- Fertilizers provide immediate benefits, but their effects are short-term and can lead to soil degradation.
- Manure, on the other hand, provides long-term benefits and improves soil fertility.
Crop Protection
- Preventive measures and biological control methods are preferred for protecting crops due to the environmental hazards associated with chemical pesticides.
- Biological control methods, such as bio-pesticides, are used to protect crops from pathogens, insects, and rodents.
Grain Storage
- Biotic factors (living organisms) and abiotic factors (non-living factors) are responsible for grain losses during storage.
- Factors responsible for grain losses include: • Insects • Rodents • Microorganisms • Moisture • Temperature fluctuations
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Description
Get free PDF download of NCERT Solutions for Class 9 Science Chapter 15 - Improvement In Food Resources. This chapter in the CBSE Syllabus has now been renumbered as Chapter 12. Enhance your understanding of basic concepts and prepare for CBSE Class 9 exams with these comprehensive solutions.
