NCERT Solutions for Improvement in Food Resources Class 9 Chapter 12 Science has all the solutions to the questions provided in the NCERT Book of the latest edition.
Students are advised to practice all the questions to get good marks in the board examination.
| Textbook | NCERT |
| Class | 9 |
| Subject | Science |
| Chapter | 12 |
| Chapter Name | Improvement in Food Resources |
| Category | NCERT Solution |
Class 9 Science Chapter 12 Improvement in Food Resources NCERT Solution
Improvement in Food Resources Intext Questions Page 141
What do we get from cereals, pulses, fruits and vegetables?
Answer
Cereals are a good source of carbohydrates, pulses provide protein, fruits and vegetables provide minerals, carbohydrates and protein.
Improvement in Food Resources Intext Questions Page 142
How do biotic and abiotic factors affect crop production?
Answer
Biotic factors like insects, pests, etc. They may spread disease and reduce crop production.
Abiotic factors like temperature, water, sunlight, etc. Water logging reduces aeration of soil which is harmful to growth and functioning of roots. In drought, water is not available to meet the requirements of the plants for transpiration, growth, and photosynthesis.
What are the desirable agronomic characteristics for crop improvements?
Answer
These are:
- High nutritional content,
- High crop yield,
- Resistance to pests and diseases,
- Wider adaptability.
Improvement in Food Resources Intext Questions Page 143
What are macro-nutrients and why are they called macro-nutrients?
Answer
Carbohydrate, fat, and protein are macronutrients. Because they are needed in more quantity for energy requirements and to maintain the body’s structure and systems.
How do plants get nutrients?
Answer
Plants obtain nutrients from air, water and soil, while carbon and oxygen are obtained from water.
Improvement in Food Resources Intext Questions Page 144
Compare the use of manure and fertilizers in maintaining soil fertility
Answer
| Manure | Fertilizers |
| Improve soil quality by adding minerals. | Soil quality decreases by time. |
| Soil erosion is reduced. | Promotes soil erosion. |
| Water retention increased. | Water retention decreased. |
Improvement in Food Resources Intext Questions Page 145
Which of the following conditions will give the most benefits? Why?
Answer
Option (C)
All these methods will increase the quality and quantity of the crop
Improvement in Food Resources Intext Questions Page 146
Why should preventive measures and biological control methods be preferred for protecting crops?
Answer
Because use of chemicals will increase toxicity in crops and will lead to harmful effects on consumers and also to the surroundings.
So, biological methods are preferred to prevent them from getting attacked by pests
What factors may be responsible for losses of grains during storage?
Answer
- Biotic factors (birds, rodents, rats, mites, insects, etc.)
- Abiotic factors (improper temperature, humidity, high moisture content, etc.)
Improvement in Food Resources Intext Questions Page 147
Which method is commonly used for improving cattle breeds and why?
Answer
Cross breeding because in this two different varieties of breeds are crossed together to make a new breed carefully having resistance to different diseases.
Improvement in Food Resources Intext Questions Page 148
Discuss the implications of the following statement:
Answer
Poultry farming aims in raising chicken, ducks etc for their meat and eggs, here they feed on insects and seeds etc which converts the low fibre stuff into highly nutritious animal protein
Improvement in Food Resources Intext Questions Page 148
What management practices are common in dairy and poultry farming?
Answer
Common practices in dairy and poultry farming are:
- Hygienic shelter
- Good quality food
- Proper cleaning and washing of cattle
- Proper sunlight
- Proper ventilation
What are the differences between broilers and layers and in their management?
Answer
The poultry birds raised for their meat are called broilers, they need a protein enriched diet with adequate fat.
The poultry birds raised for their eggs are called layers, their food requirements are different from broilers and also they need more space and proper lighting.
Improvement in Food Resources Intext Questions Page 150
How are fish obtained?
Answer
Fishes are obtained by two methods are capture fishery and culture fishery.
What are the advantages of composite fish culture?
Answer
Advantages of composite fish culture are:
- Many different fishes can be cultured as they don’t compete for food.
- Survival of fish is easy.
- Good production.
- Better quality of fish products.
- More income.
Improvement in Food Resources Intext Questions Page 150
What are the desirable characters of bee varieties suitable for honey production?
Answer
These are:
- Bees should yield a good amount of honey.
- Bees should be disease resistant.
- They should gather enough nectar.
- They should be able to adapt to the area they are being cultured.
What is pasturage and how is it related to honey production?
Answer
Pasturage refers to the availability of flowers to the bees for easy accessibility of the pollen and nectar collection.
The amount and quality of honey depend upon type and extent of pasturage.
Improvement in Food Resources Exercise Questions
Explain any one method of crop production which ensures high yield.
Answer
Crop rotation is method of crop production in which crop is sown alternately which ensures high yield.
Growing one crop in one season and another in the next is generally the method followed for crop rotation.
Why are manure and fertilizers used in fields?
Answer
Manures and fertilizers are used in fields to increase the nutrients supply of the plant and help them grow. They also increase the fertility of the soil.
What are the advantages of inter-cropping and crop rotation?
Answer
Advantages of Inter-cropping:
- Less water requirement.
- Less loss of production.
- Decreased chances of soil erosion.
Advantages of Crop rotation:
- Farmers can grow 2-3 crops annually.
- Use of land perfectly.
- Increased income.
What is genetic manipulation? How is it useful in agricultural practices?
Answer
Genetic manipulation is the technique of transfer of a gene from one organism to another using a particular technique. The gene should have a desirable character.
This is done for production of varieties with desirable characteristics like profuse branching in fodder crops, high yielding varieties in maize, wheat , etc.
For example: sugar cane, a plant which can grow in Northern part of India having good yield production having thick stems, but there is a variety of crop of the same genus which can’t give good production in the southern part due to thin stems. So the gene having a thick stem trait is taken from the plant growing in the northern part and incorporated into the southern part sugarcane.
How do storage grain losses occur?
Answer
Various reasons are:
- Flood
- Rain
- Temperature
- Wind
- Insects
- Pests
- Rodents.
How do good animal husbandry practices benefit farmers?
Answer
The benefits are:
- Good quality of cattle products.
- Can also be used in agricultural practices.
- Increased income of farmers
What are the benefits of cattle farming?
Answer
Benefits of cattle farming are:
- Cattle can be used for agricultural practices.
- Generation of good quality milk.
- Production of good quality meat.
- Skin of cattle used for leather.
- Their excretory product is used as manure.
For increasing production, what is common in poultry, fisheries and bee-keeping?
Answer
Cross breeding is used to increase the production in poultry, fisheries and bee-keeping to produce hybrids which are of better quality and can fetch a high market value.
Also proper cleaning of farms, maintenance of temperature, prevention and cure of diseases are important.
How do you differentiate between capture fishing, mariculture and aquaculture?
Answer
Capture fishing is capturing fishes in a water reservoir like sea, river, ponds etc.
Mariculture is the culturing of marine fishes for commercial use.
Aquaculture is the culturing of both freshwater and marine organisms that are of high economic value such as prawn, lobsters, fishes, crabs, etc.
Hope NCERT Solutions for Class 9 Science Chapter 12 Improvement in Food Resources, helps you in solving problems. If you have any doubts, drop a comment below and we will get back to you.