NCERT Solutions for Class 9 Science Unit 15

Improvement in Food Resources Class 9

Unit 15 Improvement in Food Resources Exercise Solutions

India is a very populous country. Our population is more than one billion people, and it is still growing. As food for this growing population, we will soon need more than a quarter of a billion tonnes of grain every year. This can be done by farming on more land. But India is already intensively cultivated. As a result, we do not have any major scope for increasing the area of land under cultivation. Therefore, it is necessary to increase our production efficiency for both crops and livestock.
Efforts to meet the food demand by increasing food production have led to some successes so far. We have had the green revolution, which contributed to increased food-grain production. We have also had the white revolution, which has led to better and more efficient use as well as availability of milk.
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Question : Solutions of Questions on Page Number : 204

Q1 :  

What do we get from cereals, pulses, fruits and vegetables?


Answer :

(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.

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Q2 :  

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.

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Q3 :  

What are the desirable agronomic characteristics for crop improvements?


Answer :

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Q4 :  

What are macro-nutrients and why are they called macro-nutrients?


Answer :

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Q5 :  

How do plants get nutrients?


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Q6 :  

Compare the use of manure and fertilizers in maintaining soil fertility.


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Q7 :  

Which of the following conditions will give the most benefits? Why?

(a) Farmers use high-quality seeds, do not adopt irrigation or use fertilizers.

(b) Farmers use ordinary seeds, adopt irrigation and use fertilizer.

(c) Farmers use quality seeds, adopt irrigation, use fertilizer and use crop protection measures.


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Q8 :  

Why should preventive measures and biological control methods be preferred for protecting crops?


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Q9 :  

What factors may be responsible for losses of grains during storage?


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Q10 :  

Which method is commonly used for improving cattle breeds and why?


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Q11 :  

Discuss the implications of the following statement:

"It is interesting to note that poultry is India's most efficient converter of low fibre food stuff (which is unfit for human consumption) into highly nutritious animal protein food."


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Q12 :  

What management practices are common in dairy and poultry farming?


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Q13 :  

What are the differences between broilers and layers and in their management?


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Q14 :  

How are fish obtained?


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Q15 :  

What are the desirable characters of bee varieties suitable for honey production?


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Q16 :  

What are the advantages of composite fish culture?


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Q17 :  

What is pasturage and how is it related to honey production?


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Exercise : Solutions of Questions on Page Number : 214

Q1 :  

Explain any one method of crop production which ensures high yield.


Answer :

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Q2 :  

Why are manures and fertilizers used in fields?


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Q3 :  

What are the advantages of inter-cropping and crop rotation?


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Q4 :  

What is genetic manipulation? How is it useful in agricultural practices?


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Q5 :  

How do storage grain losses occur?


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Q6 :  

How do good animal husbandry practices benefit farmers?


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Q7 :  

What are the benefits of cattle farming?


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Q8 :  

For increasing production, what is common in poultry, fisheries and bee-keeping?


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Q9 :  

How do you differentiate between capture fishing, mariculture and aquaculture?


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Science : CBSE NCERT Exercise Solutions for Class 9th for Improvement in Food Resources will be available online in PDF book form soon. The solutions are absolutely Free. Soon you will be able to download the solutions.

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