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NCERT Solution for Class 9 Science Chapter 15: Improvement in Food Resources

Improvement in Food Resources
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In this chapter 15 Improvement in Food Resources, you will get to know about nutrients supplied by air, water, and soil, crop production, crop production management, fertilizers, manure, storage of grains, animal husbandry, the nutritional value of food, fish production, and beekeeping.

NCERT Solution Class 9 Science of Chapter 15 includes all Intext exercises and an NCERT exercise for you. The NCERT exercise includes solutions to all 9 questions given in your NCERT Textbook. These questions are designed to test and enhance your metacognitive skills, analysis, and cognizance. Read the text thoroughly and practice the questions by yourself to prepare for your exams. These chapters are high-scoring and can help you ace your examinations.

Ncert solutions

NCERT Solution for Class 9 Science Chapter 15: Improvement in Food Resources Ex 15.1

Exercise 15.1

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

Cereals like wheat and rice provides us carbohydrate. The body’s energy requirement. Pulses provide protein. While fruits and vegetables gives us a range of vitamins and minerals in addition to some amount of proteins, carbohydrate and fats.

Exercise 15.1.1

How do biotic and biotic factors affect crop production?

Crop production can goes down due to the effect of‘ biotic factors like disease, insects. nematodes, etc. and a biotic factors like drought. Salinity, water logging, heat. Cold and frost.

What are the desirable agronomic characteristics for crop Improvement?

The fodder crop should be tall with profuse branching, while cereals crop should be dwarf, so that they are more nutritive. Agronomic character helps giving higher productivity.

Exercise 15.1.2

What are macronutrients and why are they called macronutrients?

Thirteen essential nutrients required by the plants are supplied by soil. Out of them six nutrients are required in large quantities. Since, they are required in large quantities, they are called as macronutrients. They are
l. nitrogen 2. Phosphorus, 3.Potassium, 4.Calcium, 5.Magnesium 6.Sulphur

How do plants get nutrients?

Plants require sixteen essential nutrients for their growth. They are supplied by air, water and soil. Air supplies carbon and oxygen. Hydrogen comes from water and soil supplies other thirteen nutrient to plants.

Exercise 15.1.2

Compare the use to manure and fertilisers maintaining soil fertility.

Manure lo the organic matter having some nutrients. Therefore. Soil supplied with manure may nutrient deficiency of nutrients, resulting in poor yield, whereas fertilisers are the inorganic compound having sufficient nutrients that can fulfill the soil’s nutrition requirement. Amt from these using fertilisers for long time may destroy the soil structure by killing all the microorganisms.

Exercise 15.1.3

Which of the following conditions will give the most benefits? Why?
(a) Farmers use high-quality seeds, do not adopt irrigation or use fertilisers.
(b) Farmers use ordinary seeds, adopt irrigation use fertilisers.
(c) Farmers use quality seeds, adopt irrigation use fertiliser and use crop
protection measures.

Condition (c) will give most benefit because
(i) Good quality seeds will give good yield.
(ii) Irrigation methods will overcome drought and flood situation.
(iii) Fertiliser will fulfill the nutrient requirement of the soil providing high yield.

Exercise 15.1.3

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

Preventive measures and biological control methods are preferred because
1) They are simple.
2) They economic us they need less money to be invested.
3) They minimize pollution.
4) They minimize the effect on soil fertility.

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

The following factor affect grain during storage:
1) Biotic factors insects. Rodents ,fungi, mites and bacteria.
2) A biotic factors Inappropriate moisture and temperature in places of storage

Exercise 15.2

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

Cross breeding among two cattle having the desired qualities is done most commonly for improving cattle breeds. Cross breeding is done to get animals with both the desired qualities.

Exercise 15.2.2

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’.

The feed consumed by poultry birds is very cheap and fibrous formulated by agricultural byproducts. In this way, the products, which are not used by humans are consumed by poultry birds and are converted into chicken meat and egg, which are highly nutritious and used by humans.

What management practices are common in dairy and poultry farming?

The management practices include
1) Keeping the shelter well designed, ventilated and hygienic.
2) The animal and birds are given healthy feed with balanced nutrition.
3) Both animals and birds must be protected from various diseases. Regular checkup should be done.

What are the different between broiler and layer in their management?

A broiler is a poultry bird specially kept for obtaining meat. While layer is the poultry bird that will give eggs. Due to the difference in the purpose of then raising There is difference In their housing,  In nutrition and environmental ration of broiler are somewhat different from those of layers .Broiler require protein rich food with adequate fat and high amount of vitamin – A and K , whereas layers
require enough space and proper lightening facility.

Exercise 15.2.3

How are fish obtained?

Fish are obtained either by capture Fishing from the natural resources or by culture fishery from fish farming.

What is the advantage of composite fish culture?

Advantages of composite Fish culture are
(i) Fish selected for this culture differ in their feeding habits.
(ii) All these species together use all the food in the pond without competing with each other.
(iii) This increase the fish yield from the pond.

Exercise 15.2.4

What are the desirable characters of bee varieties suitable for honey

The desirable characters are
(i) The bee should have good honey collection capacity.
(ii) The bee should protect themselves from enemy.
(iii) Prolific queen production with less swarming.

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

Pasturage includes the flora found around an apiary form, which sector is sucked by bees to form honey.
(i) Quality of honey depends upon the pastor age.
(ii) Kinds of flower will determine the taste of honey.

Exercise 1

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

Using proper irrigation technique ensures high yield. Due to which irrigation technique a farmer does not have to depend on weather for water. Hence, the loss of crops due to drought or less rainfall is minimised ensuring good yield.

Why are manure and fertilisers used in fields?

Manures and fertilisers are used to improve soil fertility by improving the soil stratas and nutrient content in soil.

What are the advantages of inter cropping and rotation?

Advantages of inter Cropping
(i) Crops selected for this differ in their nutrient requirement and ensuring maximum utilisation of the nutrients supplied.
(ii) Prevents pests and disease from spreading to all the plants belonging to one crop in a field.
Advantages of Crop Rotation
(i) It makes the soil fertile and increase the yield from a single field.
(ii) Use of nitrogenous fertilisers is not required as leguminous plants that are grown in crop rotation help in biological nitrogen fixation.
(iii) The selected rotation of crops helps in controlling pests.

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

Genetic manipulation is the incorporation of desirable characters by hybridisation, mutation, DNA recombination, etc. By genetic manipulation improved varieties of seeds can be obtained having desirable characters like high yield, disease resistance and better adaptibility.

How do stored grain losses occur?

There are two types of factors responsible for losses during storage of grains.
(i) Biotic factors Insects, rodents, mites and bacteria.
(ii) A biotic factors Temperature and inappropriate moisture in place of storage moisture in place of storage.

How do good animal husbandry practices benefit farmers?

Animal husbandry involves the scientific management of the farm animals. The benefit to farmers is
(i) Improvement of the breeds having good desirable characters.
(ii) Better yield in quantity and quality. (iii) Reduction of input cost.

What are the benefits of cattle farming?

Ans. Main benefits of cattle farming are
(i) We get milk from cattle. Various milk products can only be manufactured with this milk.
(ii) Cattles are also employed for labour work in agricultural fields for tilling, irrigation and carting.

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

The common features are
1) A good and improved variety should be selected.
2) Proper shelter facilities should be given.
3) Disease control should be done properly.

How do you differentiate between capture fishing, mariculture and

Solution: Refer pdf.

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