ncert questions - improvement in food resources - everonn - cbse class-9th

5/21/2018 NCERT Questions - Improvement in Food Resources - Everonn - CBSE Class-9th

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NCERT Questions - Improvement in Food Resources - Everonn - CBSE Class-9thLoading.... Coupon Accepted Successfully! Explore Login Signup

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1. Matter in Our Surroundings2. Is Matter Around us Pure3. Atoms and Molecules4. Structure of the Atom5. The Fundamental Unit of Life6. Tissues7. Diversity in Living Organisms

8. Motion9. Force and Laws of Motion10. Gravitation11. Work and Energy12. Sound13. Why do We Fall ill14. Natural Resources15. Improvement in Food ResourcesNCERT Questions Topics: NCERT Questions Extra Questions

Question-1

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

Solution:Hybridisation It is a process of crossbreeding. In this two varieties of acrop, each possessing at least one desired character, are selected, for example,one with high yield and other one with disease resisting character. The twovarieties with desired characters are cross-bred to incorporate the desiredcharacters in one variety.CommentQuestion-2Why are manures and fertilizers used in fields?

Solution:By continuous cultivation of crops, the nutrients of the soil get depleted. So,to supply nutrients and to keep soil fertility manures and fertilizers are used.CommentQuestion-3What are the advantages of intercropping and crop rotation?

Solution:Advantage of intercropping In intercropping two or more crops are on thesame field in a definite row pattern. That is, a few rows of the crop andadjoining to that, a few rows of another crop are planted. This practice reducesintraspecific competition for same type of nutrients. In this way both crops can

give better yield.

Advantages of crop rotation:

(i) Crop rotation makes the soil fertile and helps in the production of cropyield.

(ii) It decreases the demand of nitrogenous fertilizers. Leguminous plants grown


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during crop rotation fix atmospheric nitrogen and enrich the soil with nitrogencompounds.

(iii) Rotation of crops helps in pest control. Pests do not find their favouritecrop in the next season and find hard to survive.CommentQuestion-4What is genetic manipulation? How is it useful in agricultural practices?

Solution:

Genetic manipulation means to incorporate desired characters in plants byhybridisation, mutation, DNA recombination, polyploidy etc. Use in agriculturalpractices By genetic manipulation improved variety of seeds can bedeveloped. The quality seeds having desired characters such as resistance todisease and drought , better input response, goon in quality and higher yield,to reduce the input cost.CommentQuestion-5What do we get from cereals, pulses, fruits and vegetables?

Solution:Cereals CarbohydratesPulses Proteins

Fruits and vegetables Vitamins, minerals along with small quantities ofproteins, carbohydrates and oil .CommentQuestion-6How do biotic and abiotic factors affect crop production?

Solution:Biotic factors, such as diseases, insects and nematodes and abiotic factors,such as drought, salinity, water logging, heat, cold and frost, cause stresseson the crops. This results in decrease of crop production. Sometimes thesestresses under different situations may cause destruction of the whole crop.CommentQuestion-7

What are the desirable agronomic characteristics for crop improvement?

Solution:Desirable agronomic characteristics in crop plants help to give higher yield.For example, desirable characters for fodder crops are tallness and profusebranching. For cereal crops dwarfness is the desired character so that lessnutrients are consumed by these crops.CommentQuestion-8What are macronutrients and why are they called macronutrients?

Solution:Macronutrients are the chemical elements required by plants such as carbon,

hydrogen, oxygen, nitrogen, phosphorus, potassium and sulphur. They are calledmajor or macronutrients because they are required in large quantities.CommentQuestion-9How do plants get nutrients?

Solution:Plants need 16 nutrients. Out of these 16 elements, plants get 2 nutrients fromair, 1 nutrient from water and rest of 13 nutrients from the soil.Comment


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Question-10Compare the use of manure and fertilizers in maintaining soil fertility.

Solution:Manures are rich in organic matter but are poor supplier of nutrients. So, thecultivated field, which is not supplied with fertilizers, may suffer fromdeficiency of nutrients and may not give very good yield.The cultivated field, which is supplied with fertilizers, may only face drainageproblem and water logging, due to lack of organic matter in the soil. This mayharm the crop and the yield. Use of fertilizers over long periods of time can

destroy the soil structure by killing the soil microorganisms that recyclenutrients in the soil.CommentQuestion-11Which of the following conditions will give most of the benefits? Why?

Solution:(a) Farmers use quality seeds but do not adopt irrigation and use fertilizers.(b) Farmers use ordinary seeds and adapt irrigation and use fertilizers.(c) Farmers use quality seeds, adopt irrigation, use fertilizers and use cropprotection measures.

Conditions given in (c) are beneficial for farmers because the use of

(i) Quality seeds will provide genotypes for various characters such asresistance, input response, quality and higher yield.(ii) Proper irrigation methods fulfill water requirement of crop at proper time.(iii) Fertilizers will provide required nutrients.(iv) Crop protection measures will check loss of crop and crop product. Thus,farmers will get maximum benefit of their input in the form of good seeds andagronomic approaches.CommentQuestion-12Why should preventive measures and biological control methods be preferred forprotecting crops.

Solution:

Preventive measures and biological control, are safe methods for protectingcrops. They do not cause environmental pollution. Chemical measures such asspraying chemicals on crops or treating seeds with chemicals cause environmentalpollution.Moreover, biological control method protect crops from the beginning, i.e beforeweeds, pests and diseases tend to affect the plants.CommentQuestion-13What factors may be responsible for the loss of grains during storage?

Solution:

There is about 9.3% annual loss of grain during storage. The causes of loss ofgrains are due to(i) Biotic factors such as insects, fungi, bacteria, rodents, mites, birds, etc.(ii) Abiotic factors such as moisture content in grains and temperature at whichthey are stored.CommentQuestion-14Which method is commonly used for improving cattle breeds and why?


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Solution:Artificial inseminationReasons: (i) Semen of bull can be obtained / imported / transported to remoteparts of the country. It is because semen can be frozen and can be stored for along period.(ii) By artificial insemination many cows can be fertilized by the semencollected from one bull.CommentQuestion-15Discuss the implication of the following statement

Solution:"It is interesting to note that poultry is Indias most efficient converter oflow fibre food stuff into highly nutritious animal protein food".It means that in India which is the 5th largest country in poultry farming ,mainly fowl can be raised on low fibre food stuff which is unfit for humanconsumption. Poultry provide both egg and meat, which are rich sources ofproteins. Chickens and eggs are poultry products of large section ofnon-vegetarian population.CommentQuestion-16What management practices are common in dairy and poultry farming?

Solution:

Important points to remember in dairy and poultry farming are:(i) Proper housing, hygienic conditions, i.e., cleaning, sanitation, sprayingdisinfectants at regular intervals.(ii) Vaccination for prevention of infectious diseases.(iii) Selection of good quality breed.(iv) Enough space, proper light intensity and duration and maintenance oftemperature.(v) Proper feeding management.CommentQuestion-17What is the difference between broilers and layers and in their management?

Solution:

Broilers: Chicken raised up to 6-7 weeks weighing 700 g to 1.5 kg are calledbroilers.Management: They are fed proteins, fats with vitamins especially vitamin A andvitamin K which is a rich supplementary feed for good growth rate and betterfeeding efficiency. Care is taken to avoid mortality, feathering and carcassquality and hygienic condition is provided.Layers are hens, which start laying eggs at the age of 20 weeks. The eggproduction in commercial layer is 500 days.Management includes maintenance of temperature and hygienic conditions inhousing, poultry feed, prevention and control of diseases, pests etc.The layers require enough space, proper light intensity and its duration.Feeding of vitamins, minerals and micronutrients also influence hatchability ofeggs.

CommentQuestion-18How are fish obtained?

Solution:Fish is obtained by catching from natural resources called capture fisheries.Fish is also cultivated by various culture methods.CommentQuestion-19What are the desirable characters of bee variety suitable for bee keeping?


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Solution:Desirable characters of bees for bee keeping are(i) Good honey collection capacity,(ii) Prolific queen production with less swarming,(iii) Ability to protect itself from enemies.CommentQuestion-20What is pasturage and how it is related to honey production?

Solution:

Pasturage The flora/crops found around apiary to collect honey and pollengrains is called pasturage.

Pasturage flora of honeybee includes, Mango, Coconut, Almond, Sisham, Apple,Tamarind, Mahua, and Coriander.Relation with honey production The quality and the taste of honey dependupon the flora/pasturage around the apiary, from which bees collect the nectarand pollens. For example, region of Kashmir having almond plant pasturage thatproduce almond honey which is good in quality, taste and smell.Comment

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