Class 9 Science Chapter 15 NCERT Solutions – Free PDF Download
This chapter has been withdrawn from the CBSE Revised Term-wise Syllabus 2021-22.
The NCERT Solutions for Class 9 Chapter 15 Improvement in Food Resources are provided here to assist students in their CBSE Class 9 test preparation and to ensure that they fully comprehend the chapter’s basic ideas.
While studying for the examination, students can use NCERT Solutions for Class 9 Science to increase their self-confidence. These solutions assist students in quickly and effectively resolving their doubts. For easy understanding, NCERT Solutions for Class 9 Science are produced by highly experienced professional subject specialists. NCERT Solutions for Class 9 Science Chapter 15: Improvement in Food Resources explains the NCERT textbook exercises and problems.
CHAPTER 15_IMPROVEMENTS IN FOOD RESOURCES NCERT SOLUTIONS
1.What do we get from cereals, pulses, fruits and vegetables?
i) Cereals provide us with carbohydrates.
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.
2. How do biotic and abiotic factors affect crop production?
A. Biotic factors :
i) A variety of biotic factors such as pests, nematodes, pathogens, weeds etc. can reduce the net crop production.
ii) A pest causes damage to agriculture by feeding on crops.
iii) For example, boll weevil is a pest on cotton. It attacks the cotton crop, thereby reducing its yield.
iv) Weeds also reduce crop productivity by competing with the main crop for nutrients, light, and space.
Abiotic factors :
i) Abiotic factors such as salinity, temperature, etc. affect the net crop
ii) The occurrence of natural calamities like droughts and floods have a great impact on crops. Sometimes they destroy the entire crop.
3. What are the desirable agronomic characteristics for crop improvements ?
A. i) Tallness and profuse branching in fodder crops.
ii) Dwarfness in cereals.
4. What are macro-nutrients and why are they called macro-nutrients?
A. i) The nutrients that are required in relatively large quantities for growth and development of plants are called macronutrients.
ii) As they are required in large quantities, they are known as macronutrients.
5. How do plants get nutrients?
A. Plants obtain nutrients from the soil through their roots.
6. Compare the use of manure and fertilizers in maintaining soil fertility.
A. i) Manures increase soil fertility by enriching the soil with organic matter and nutrients as it is prepared by the decomposition of animal excreta and plant wastes.
ii) On the other hand, fertilizers are mostly inorganic compounds whose excessive use is harmful to the symbiotic microorganisms living in the soil.
iii) Their excessive use also reduces soil fertility.
iv) Hence, fertilizers are considered good for only short term use.
7. Which of the following conditions will give the most benefits? Why?
a) Farmers use high-quality seeds, do not adopt irrigation or use
b) Farmers use ordinary seeds, adopt irrigation and use fertilizers.
c) Farmers use quality seeds, adopt irrigation, use fertilizers and use crop protection measures.
A. c) Farmers using good quality seeds, adopting irrigation, using fertilizers, and using crop protection measures will derive most benefits.
i) If a farmer is using good quality seeds, then a majority of the seeds will germinate properly, and will grow into healthy plants.
ii) Proper irrigation methods improve the water availability to crops.
iii) Fertilizers ensure healthy growth and development in plants by providing the essential nutrients such as nitrogen, phosphorus, potassium, etc.
iv) Crop protection measures include various methods such as control of weeds, pests, and infectious agents and will help in improving the crop productivity.
8. Why should preventive measures and biological control methods be preferred for protecting crops?
A. i) Preventive measures and biological control methods help in keeping away the pathogens, insect pests, etc.
ii) They are simple, economic and eco-friendly methods of crop protection.
9. What factors may be responsible for losses of grains during storage?
A. i) Biotic factors : Insects, rodents, mites, fungi, bacteria, etc.
Abiotic factors : Inappropriate moisture, temperature, lack of sunlight, flood, etc.
ii) These factors act on stored grains and result in degradation, poor germinability, discolouration, etc.
10.Which method is commonly used for improving cattle breeds and why?
A. i) Cross breeding is the commonly used method for improving cattle breeds.
ii) By this method we can get the animals with desired qualities. Eg: Animals with long lactation period and with disease resistance capacity, etc.
11.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.”
A. i) Poultry birds in our country feed on low fibre food stuff (they have the ability to utilise fibrous food) and convert it into eggs and meat which are rich in source of proteins.
ii) Hence, they are called most efficient converters of low fibre food stuff into highly nutritious animal protein food.
12. What management practices are common in dairy and poultry farming?
A. i) Feeding the animals
ii) Providing proper shelter
iii) Proper cleaning, sanitation, etc.
iv) Prevention and control of diseases (Vaccination)
v) Maintenance of temperature (in poultry), etc.
13.What are the differences between broilers and layers in their management ?
A. i) Layers are meant for egg production, whereas broilers are meant for poultry meat. Nutritional, environmental and housing conditions required by broilers are different from those required by egg layers.
ii) A broiler chicken, for their proper growth requires vitamin rich supplements especially vitamin A and K. Also, their diet includes protein rich food and enough fat.
iii) They also require extra care and maintenance to increase their survival rate in comparison to egg layers.
14. How are fish obtained?
A. i) Capture fishing : It is the process of obtaining fish from natural resources.
ii) Culture fishery : It is the practice of farming fishes.
15. What are the advantages of composite fish culture?
A. i) It increases the yield of fish from the pond.
ii) In this method, five or six different species are grown together in a single fish
iii) Fishes with different food habitats are chosen, so that they do not compete for food among themselves.
iv) It ensures a complete utilization of food resources in the pond. As a result, the survival rate of fish increases and their yield also increases.
v) More intensive fish farming can be done in this method.
16. What are the desirable characters of bee varieties suitable for honey production?
A. The desirable characters of bee varieties are :
i) They should yield high quantity of honey.
ii) They should not sting much.
iii) They should stay in the beehive for long durations.
iv) They should breed very well.
17. What is pasturage and how is it related to honey production?
A. i) The availability of flowers to the bees for nectar and pollen collection is called pasturage.
ii) The value or quality and the taste of the honey depends upon the pasturage.
18. Explain any one method of crop production which ensures high yield.
A. i) Crop rotation is one of the methods of crop production that ensures high yield.
ii) In this method, two or more varieties of crops are grown on the same land in sequential seasons.
iii) Crops having different nutrient requirements are rotated. For example, legumes which have nitrogen-fixing bacteria in their root nodules supply the soil with nitrogen.
iv) Therefore, these legumes are rotated with nitrogen requiring cereals such as wheat and maize.
v) This method reduces the need of fertilizers, thereby increasing the overall yield of crops.
19. Why are manures and fertilizers used in fields?
A. Manures and fertilizers are used in fields :
i) to enrich the soil with organic matter and nutrients.
ii) to improve the fertility and structure of the soil.
20. What are the advantages of inter-cropping and crop rotation?
A. i) Inter-cropping helps in preventing the spread of pests and diseases. It increases soil fertility.
ii) Crop rotation prevents soil depletion, increases soil fertility and reduces soil
iii) Both these methods play major role in increasing the yield of crops and reduce the need for fertilizers.
iv) They also help in controlling weeds, pathogens, and pests in crops.
21. What is genetic manipulation? How is it useful in agricultural practices?
A. The process in which the gene for a particular character is introduced inside the chromosome of a cell is called genetic manipulation.
Genetic manipulation helps in :
i) producing transgenic plants
ii) improving crop variety
iii) ensuring the food security
iv) producing insect resistant crops
v) improving the quality and yield of crops
22. How do storage grain losses occur?
A. i) There are various biotic and abiotic factors that act on stored grains and result in degradation, poor germinability, discolouration, etc.
ii) Biotic factors include insects or pests that cause direct damage by feeding on seeds. They also deteriorate and contaminate the grain, making it unfit for further consumption.
iii) Abiotic factors such as temperature, light, moisture, etc. also affect the seed. They decrease the germinating ability of the seeds and make them unfit for future use by farmers.
23. How do good animal husbandry practices benefit farmers?
A. i) Cattle farming is one of the methods of animal husbandry that is most beneficial for farmers.
ii) Using this method, better breeds of drought animals can be produced. Such drought animals are engaged in agricultural fields for labour work such as carting, irrigation, tilling, etc.
24. What are the benefits of cattle farming?
A. i) Good quality and quantity of milk can be produced.
ii) Drought labour animals can be produced for agricultural work.
iii) New varieties that are resistant to diseases can be produced by crossing two varieties with the desired traits.
25. For increasing production, what is common in poultry, fisheries and beekeeping? (Or) What is common in poultry, fisheries and in beekeeping with respect to the increase in food production from animals?
A. The common factor for increasing production in poultry, fisheries, and bee keeping are :
i) Proper management techniques are to be followed.
ii) Regular cleaning of farms.
iii) Maintenance of temperature and prevention and cure of diseases, etc.
26.How do you differentiate between capture fishing, mariculture and aquaculture?
|It is the method of obtaining fishes from natural resources||It is the culturing of marine fishes for commercial use||It involves the production of aquatic animals that are of high economic value such as prawns, lobsters, fishes, crabs, etc.|
NCERT Exemplar Solutions for Class 9 Science Chapter 15 NCERT Exemplar Solutions for Class 9 Science Chapter 15 NCERT Exemplar Solutions for Class 9
Chapter 15 of CBSE Notes for Class 9 Science
NCERT Solutions for Class 9 Science Chapter 15 – Food Resources Improvement
NCERT Solutions for Class 9 Science Chapter 15 discusses numerous methods for improving yield quality. It also explains the many methods for protecting the crop from various environmental variables. The relevance of manure and fertilizers to the soil and crop is briefly discussed. The abiotic and biotic elements that affect crop production are explained in NCERT Solutions for Class 9 Science Chapter 15 Improvement in Food Resources. This chapter also discusses the importance of cattle breeding, animal husbandry, and poultry science. The production of fish, as well as the distinction between layers and broilers. Unit 5 Food; Food Production is covered in NCERT Class 9 Science Chapter 15, and questions up to 4 marks are expected. The following are some of the themes covered in this chapter:
- Crop yields are increasing (1 question)
- Improvements in crop variety (2 questions)
- Management of crop production (3 questions)
- Management of crop protection (3 questions)
- Farming of cattle (1 question)
- Farming of poultry (2 questions)
- Beekeeping is a craft that involves keeping bees (2 questions)
- Exercises at the End of Each Chapter (9 Questions)
Chapter 15 of Science for Class 9 Exercise 15.1 Solution: Increased food resources
NCERT Solutions for Class 9 Science Chapter 15 – Food Resources Improvement
Chapter 15 of the NCERT answers for Class 9 describes numerous agricultural practices such as
- Fish culture
- Poultry production
- Animal husbandry
- Cattle rearing
- It refers to the Hybridization approach for increasing crop output.
- Describes the effects of biotic and abiotic variables on crop yield.
- The importance of manures and fertilizers, as well as their impacts
Chapter 15 – Improvement in Food Resources: Key Features of NCERT Solutions for Class 9 Science Chapter 15 – Improvement in Food Resources:
- All of the questions in the relevant NCERT textbooks are entirely solved in this book.
- These answers will come in handy for CBSE board examinations, Science Olympiads, and other competitive exams.
- The language utilized is straightforward and easy to understand for the kids.
- Our subject specialists prepare these solutions after conducting a significant study on each topic in order to present students with relevant and accurate information.
- To assist students in their preparations, provide detailed solutions to all of the questions.
NCERT Solutions for Class 9 Science Chapter 15 Frequently Asked Questions
What are the key concepts discussed in NCERT Solutions for Class 9 Science Chapter 15?
The following are some of the key concepts taught in Chapter 15 of NCERT Solutions for Class 9 Science:
Crop yields are increasing (1 question)
Improvements in crop variety (2 questions)
Management of crop production (3 questions)
Management of crop protection (3 questions)
Farming of cattle (1 question)
Farming of poultry (2 questions)
Beekeeping is a craft that involves keeping bees (2 questions)
Exercises at the End of Each Chapter (9 Questions)
What would I gain by studying NCERT Solutions for Class 9 Science Chapter 15?
- In Chapter 15 of NCERT Solutions for Class 9 Science, several agricultural practices such as fish culture, poultry production, animal husbandry, and cattle rearing are discussed.
- The term “hybridization” refers to a method of improving crop output by cross-pollination.
- A brief explanation of how biotic and abiotic variables affect crop yield is provided.
- This chapter discusses the importance and impacts of fertilizers and manures.
How can you use the NCERT Solutions for Class 9 Science Chapter 15 to help you prepare for your exams?
Students can save time and concentrate better on the ideas by using the NCERT Solutions for Class 9 Science Chapter 15. The solutions are meticulously developed by INFINITY LEARN professionals in accordance with the most recent CBSE syllabus. While answering textbook questions, students can refer to the solutions to get a better understanding of the concepts that are vital for the tests.