NCERT Solutions Class 9 Maths Chapter 15 Improvement In Food Resources – Here are all the NCERT solutions for Class 9 Maths Chapter 15. This solution contains questions, answers, images, explanations of the complete Chapter 15 titled The Fun They Had of Maths taught in class 9. If you are a student of class 9 who is using NCERT Textbook to study Maths, then you must come across Chapter 15 Improvement In Food Resources. After you have studied lesson, you must be looking for answers of its questions. Here you can get complete NCERT Solutions for Class 9 Maths Chapter 15 Improvement In Food Resources in one place.
NCERT Solutions Class 9 Science Chapter 15 Improvement In Food Resources
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For a better understanding of this chapter, you should also see summary of Chapter 15 Improvement In Food Resources , Science, Class 9.
Improvement In Food Resources
NCERT Solutions Class 9 Science chapter 15 Improvement In Food Resources
Class 9, Science chapter 15, Improvement In Food Resources solutions are given below in PDF format. You can view them online or download PDF file for future use.
Improvement In Food Resources
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Question & Answer
Q.1: What do we get from cereals, pulses, fruits and vegetables?
Ans : (i) Cereals provide us with carbohydrates. Also, they are a rich source of energy. (ii) Pulses give us proteins. (iii) Fruits and vegetables are a rich source of vitamins and minerals. A small amount of proteins, carbohydrates, and fats are also present in them.
Q.2: How do biotic and abiotic factors affect crop production?
Ans : A variety of biotic factors such as pests, nematodes, diseases, etc. can reduce the net crop production. A pest causes damage to agriculture by feeding on crops. For example, boll weevil is a pest on cotton. It attacks the cotton crop, thereby reducing its yield. Weeds also reduce crop productivity by competing with the main crop for nutrients, light, and space. Similarly, abiotic factors such as salinity, temperature, etc. affect the net crop production. Some natural calamities such as droughts and floods are unpredictable. Their occurrence has a great impact on crops sometimes, destroying the entire crop.
Q.3: What are the desirable agronomic characteristics for crop improvements?
Ans : The desirable agronomic characteristics for crop improvements are: (i) Tallness and profuse branching in any fodder crop. (ii) Dwarfness in cereals. These desirable agronomic characteristics help in increasing crop productivity.
Q.4: What are macronutrients and why are they called macronutrients?
Ans : Macronutrients Are nutrients required in relatively large quantities for growth and development of plants. They are six in number. Since they are required in large quantities, they are known as macro-nutrient. The six macronutrients required by plants are nitrogen, phosphorus, potassium, calcium, magnesium, and sulphur.
Q.5: How do plants get nutrients?
Ans : Plants require sixteen essential nutrients from nature for their growth and development. All these nutrients are obtained from air, water, and soil. Soil is the major source of nutrients. Thirteen of these nutrients are available from soil. The remaining three nutrients (carbon, oxygen, and hydrogen) are obtained from air and water.
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