Solution of Chapter 15. Improvement in Food Resources (NCERT - Science Book)

Chapter Exercises

In Text Questions-Pg-204
In Text Questions-Pg-205
In Text Questions-Pg-206
In Text Questions-Pg-207
In Text Questions-Pg-208
In Text Questions-Pg-209
In Text Questions-Pg-210
In Text Questions-Pg-211
In Text Questions-Pg-213
Exercise-Pg-214

In Text Questions-Pg-204

1

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

In Text Questions-Pg-205

1

How do biotic and abiotic factors affect crop production?
1

What are the desirable agronomic characteristic for crop improvement?

In Text Questions-Pg-206

1

What are the macro-nutrients and why are they called macronutrients?
2

How do plants get nutrients?

In Text Questions-Pg-207

1

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

In Text Questions-Pg-208

1

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

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


(b) Farmer use ordinary seeds, adopt irrigation or use fertilizers.


(c) Farmers use quality seeds, adopt irrigation, use fertilizers and use crop protection measures?

In Text Questions-Pg-209

1

Why should preventive measures and biological control methods be preferred for protecting crops?
1

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

In Text Questions-Pg-210

1

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

In Text Questions-Pg-211

1

Discuss the implication of the following statement:

“ It is interesting to note that poultry is India’s most efficient converter of low fiber food stuff (which is unfit for human consumption) into highly nutritious protein food”.
1

What management practice are common into highly nutritious animal protein food”
1

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

In Text Questions-Pg-213

1

How are fish obtained?
2

What are the advantages of composite fish culture?
1

What are the desirable characters of bee varieties suitable for honey production?
2

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

Exercise-Pg-214

1

Explain any one method of crop production which ensures high yields.
2

Why are manures and fertilizers used in fields?
3

What are the advantage of intercropping and crop-rotation?
4

What is genetic manipulation? How is it useful in agriculture practices?
5

How do storage grain losses occur?
6

How do good animal husbandry practices benefit farmers?
7

What are the benefits of cattle farming?
8

For increasing production. What is common in poultry, fisheries and bee-keeping?
9

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