Class 9 Exam > Class 9 Notes > Improvement in Food Resources - NCERT Solution, Class 9 Science
Improvement in Food Resources - NCERT Solution, Class 9 Science PDF Download
Class IX Science
Chapter 15 – Improvement in Food Resources
Question 1:
How do biotic and abiotic factors affect crop production?
Answer:
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.
Question 2:
What are the desirable agronomic characteristics for crop improvements?
Answer:
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.
Question 3:
What are macro-nutrients and why are they called macro-nutrients?
Answer:
Macro-nutrientsare 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 macro-nutrients required by plants are nitrogen, phosphorus, potassium, calcium, magnesium, and sulphur.
Question 4:
How do plants get nutrients?
Answer:
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.
FAQs on Improvement in Food Resources - NCERT Solution, Class 9 Science
| 1. What are the major factors contributing to the improvement in food resources? |  |
Ans. The major factors contributing to the improvement in food resources are advancements in agricultural practices, use of high-yielding varieties of crops, improved irrigation techniques, proper management of soil nutrients, and effective pest control measures.
| 2. How do advancements in agricultural practices contribute to the improvement in food resources? | |
Ans. Advancements in agricultural practices, such as the use of modern machinery, improved farming techniques, and precision agriculture, help in increasing the efficiency and productivity of food production. This leads to an improvement in food resources by ensuring higher yields and better crop management.
| 3. What are high-yielding varieties of crops and how do they contribute to the improvement in food resources? | |
Ans. High-yielding varieties of crops refer to genetically improved varieties that have the ability to produce higher yields compared to traditional varieties. These varieties are developed through selective breeding or genetic engineering. By cultivating high-yielding varieties, farmers can increase their crop production and contribute to the improvement in food resources.
| 4. How does proper management of soil nutrients contribute to the improvement in food resources? | |
Ans. Proper management of soil nutrients involves practices like balanced fertilization, crop rotation, and the use of organic manures. These practices help in replenishing essential nutrients in the soil, which are necessary for the healthy growth of crops. By maintaining an optimal nutrient balance in the soil, farmers can enhance the productivity of their crops, leading to an improvement in food resources.
| 5. What are effective pest control measures and how do they contribute to the improvement in food resources? | |
Ans. Effective pest control measures involve the use of various techniques to control pests and diseases that can damage crops. These measures include the use of pesticides, biological control methods, crop rotation, and integrated pest management (IPM) practices. By effectively managing pests, farmers can protect their crops from damage and ensure a higher yield, contributing to the improvement in food resources.
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