NCERT Solutions Class 9 Science Chapter 15: Improvement In Food Resources
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NCERT Solutions Class 9 Science Chapter 15: Improvement In Food Resources

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Questions and Answers

What is the main source of energy obtained from cereals?

  • Fats
  • Vitamins
  • Proteins
  • Carbohydrates (correct)
  • Which nutrients are considered macronutrients for plants?

  • Iron and Manganese
  • Phosphorus and Nitrogen (correct)
  • Calcium and Magnesium
  • Potassium and Zinc
  • Why are biological control methods preferred for protecting crops over chemical pesticides?

  • Biological control methods are more cost-effective.
  • Biological control methods are easier to apply.
  • Chemical pesticides have a shorter effectiveness period.
  • Chemical pesticides are harmful to the environment and animals. (correct)
  • Which nutrients are present in proteins according to the text?

    <p>Phosphorus, Nitrogen, Sulphur</p> Signup and view all the answers

    What is the significant component of chlorophyll as stated in the text?

    <p>Magnesium</p> Signup and view all the answers

    Why is option (c) considered to give the most benefits in crop production?

    <p>It involves a comprehensive approach to crop cultivation.</p> Signup and view all the answers

    How can NCERT Solutions for Class 9 Science Chapter 15 help students?

    <p>Boost self-confidence in exam preparation</p> Signup and view all the answers

    What is the primary purpose of providing NCERT Solutions for Class 9 Science Chapter 15?

    <p>Enhancing understanding of basic concepts in the chapter</p> Signup and view all the answers

    Who prepares the NCERT Solutions for Class 9 Science Chapter 15?

    <p>Highly experienced professional subject experts</p> Signup and view all the answers

    What is the aim of the NCERT Solutions for Class 9 Science Chapter 15?

    <p>Clearing doubts instantly and effectively</p> Signup and view all the answers

    What do NCERT Solutions for Class 9 Science Chapter 15 aim to do before exams?

    <p>Boost self-confidence</p> Signup and view all the answers

    Who can benefit from using NCERT Solutions for Class 9 Science Chapter 15?

    <p>Students preparing for CBSE Class 9 exam</p> Signup and view all the answers

    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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    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.

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