NCERT Solutions for Class 9 Science Chapter 15

NCERT Solutions for Class 9 Science Chapter 15 Improvement in Food Resources in PDF form free to download for academic session 2020-21. 9th Science chapter 15 question answers of intext on Page 204 & 205 or Page 206 & 207 or Page 208 & 209 or Page 210 & 211 or Page 213 or Exercises in English Medium. Answers of intext questions given on पेज 229 के उत्तर or पेज 230 के उत्तर or पेज 231 के उत्तर or पेज 232 के उत्तर or पेज 235 के उत्तर or पेज 236 के उत्तर or पेज 237 के उत्तर or पेज 238 के उत्तर or पेज 239 के उत्तर or पेज 240 के उत्तर or अभ्यास के प्रश्न उत्तर in Hindi Medium to study online or download in PDF format.

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NCERT Solutions for Class 9 Science Chapter 15

Class:	9
Subject:	Science – विज्ञान
Chapter 15:	Improvement in Food Resources

9th Science Chapter 15 Answers in English & Hindi Medium

CBSE NCERT Solutions for Class 9 Science Chapter 15 Improvement in Food Resources Intext Question answers and chapter end exercises question answers are given below in PDF form as well as to study online. Visit to Discussion Forum to ask your doubts and share your knowledge. All the NCERT Solutions 2020-21 are updated according to latest NCERT Books 2020-2021.

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

Hybridisation helps to increase the crop production. It involves crossing of inter-variety, inter-specific crossing, inter-generic crossing which give plants of desired characteristics, i.e., high yield of crops which are disease resistant and respond to fertilisers positively, adaptable to the environment, need less water for irrigation and have low maturity periods.

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

Pasturage is the availability of flowers for nectar and pollen collection for honeybee.
The kind and quality of honey is determined by the kind and quality of pasturage.

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

Resistant crops variety are useful and give higher yield. Biological control methods are safe, ecofriendly, long lasting and harmless to other forms of life, therefore should be preferred.

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

The process refers to the transfer of genes from one organism to another, e.g. Bt Cotton is a genetically modified crop which carry bacterial genes, that protects this plant from insects. These are used in rice, maize, brinjal, cabbage, cauliflower to get protection from insects.

What are the advantages of inter-cropping and crop-rotation?

Inter-Cropping:
(i) Prevents pests and decreases the chances of spoiling of whole crops, therefore reduce losses and both crops can give better results.
(ii) It can also deal with less monsoon or drought because crop which needs less water can easily survive.
Crop-rotation:
(i) Farmers can grow two or three crops in a year.
(ii) Pulses take nitrogen directly from the atmosphere, and thus needed fewer amounts of fertilisers.
(iii) Vegetables and fruits can be easily grown. It makes best use of land and nutrients present in the soil.

Why are manure and fertilizers used in fields?

Manure and fertilizers supply nutrients to the soil and increases the fertility of the soil and thus increases the production. They overcome the nutritional deficiency of the soil.

Questions for Practice on 9th Science Chapter 15

Question 1:
What are the differences between broilers and layers and in their management?
Answer 1:
Broilers:
(i) They are maintained for getting meat.
(ii) They are raised up to 6-7 weeks.
(iii) They need less space and in this condition they grow fast and have low morality.
(iv) They need food rich in proteins, adequate fat along with vitamin A and K.
Layers:
(i) They are needed for eggs.
(ii) They start laying egg after 20 weeks.
(iii) They need enough space, suitable temperature and high morality.
(iv) They need restricted food with vitamins, minerals and micro-nutrients.

Question 2:
If there is low rainfall in a village throughout the year, what measures will you suggest to the farmers for better cropping?
Answer 2:
(i) Use nearby rivers directly, if available .
(ii) Use canals if available and river lift system if flow of water is slow.
(iii) Use tube wells, if possible.
(iv) Use tanks and pounds which can store rain-water.
(v) Reduce tilting. Enrich the soil with humus.
(vi) Use of drought resistant variety of corps.

Important Questions on 9th Science Chapter 15

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

Crop rotation is one of the methods of crop production that ensures high yield. It is the method of growing two or more varieties of crops on the same land in sequential seasons. A crop utilises some particular nutrients in larger quantities from the soil. Then, if the same crop is grown in subsequent seasons those nutrients will get depleted in the soil. Therefore, crops having different nutrient requirements are rotated. For example, legumes which have nitrogen-fixing bacteria in their root nodules supply the soil with nitrogen. Therefore, these legumes are rotated with nitrogen requiring cereals such as wheat and maize. This method reduces the need of fertilizers, thereby increasing the overall yield of crops.

अनाज, दाल, फल तथा सब्जियों से हमें क्या प्राप्त होता है?

आनाजों (गेंहूँ, बाजरा, ज्वार, चावल, मक्का आदि) से हमें कार्बोहाइड्रेट्स प्राप्त होते हैं।
दालों (चना, अरहर, मटर, मसूर, उड़द आदि) से हमें प्रोटीन प्राप्त होता है।
फल (आम, केला, संतरा, चीकू, अंगूर आदि) तथा सब्जियों (पालक, गाजर, मिर्ची, धनिया आदि) से हमें शर्करा, खनिज – लवण तथा विटामिन प्राप्त होते हैं।

Why are manures and fertilizers used in fields?

Manures and fertilizers are used in fields to enrich the soil with the required nutrients. Manure helps in enriching the soil with organic matter and nutrients. This improves the fertility and structure of the soil. On the other hand, fertilizers ensure a healthy growth and development in plants. They are a good source of nitrogen, phosphorus, and potassium. To get an optimum yield, it is instructed to use a balanced combination of manures and fertilizers in the soil.

What are the advantages of inter-cropping and crop rotation?

Inter-cropping and crop rotation both play an important role in increasing the yield of crops. Inter-cropping helps in preventing pests and diseases to spread throughout the field. It also increases soil fertility, whereas crop rotation prevents soil depletion, increases soil fertility, and reduces soil erosion. Both these methods reduce the need for fertilizers. It also helps in controlling weeds and controls the growth of pathogens and pests in crops.

जैविक तथा अजैविक कारक किस प्रकार फसल उत्पादन को प्रभावित करते हैं?

जैविक कारक (रोग, कीट, निमेटोड्स आदि) फसल को खाकर या उसे विक्षिप्त कर के उसकी उत्पादन क्षमता को कम कर देते हैं।
अजैविक कारक (सुखा, पाला, क्षारता, गर्मी आदि) फसल को आंशिक या पूर्णतया नष्ट कर देते हैं।

फसल सुधार के लिए ऐच्छिक सस्य विज्ञान गुण क्या हैं?

ऐच्छिक सस्य विज्ञान गुण: चारे वाली फसलों के लिए लंबी तथा सघन शाखाएँ ऐच्छिक गुण हैं। अनाज के लिए बौने पौधे उपयुक्त हैं ताकि इन फसलों को उगाने के लिए कम पोषकों की आवश्यकता हो। इस प्रकार सस्य विज्ञान वाली किस्में अधिक उत्पादन प्राप्त करने में सहायक होती हैं।

What is genetic manipulation?

Genetic manipulation is a process where the gene for a particular character is introduced inside the chromosome of a cell. When the gene for a particular character is introduced in a plant cell, a transgenic plant is produced. These transgenic plants exhibit characters governed by the newly introduced gene.

How do storage grain losses occur?

Factors responsible for such losses are biotic— insects, rodents, fungi, mites and bacteria, and abiotic— inappropriate moisture and temperatures in the place of storage. These factors cause degradation in quality, loss in weight, poor germinability, discolouration of produce, all leading to poor marketability. These factors can be controlled by proper treatment and by systematic management of warehouses.

वृहत पोषक क्या हैं और इन्हें वृहत पोषक क्यों कहते हैं?

पौधों की वृद्धि के लिए पोषक 16 तत्वों की आवश्यकता होती है। इनमें से 13 पोषकों को पौधे मिट्टी से प्राप्त करते हैं। मिट्टी से प्राप्त होने वाले पोषकों में से 6 पोषकों की अधिक मात्रा में आवश्यकता होती है। जिन्हें वृहत पोषक कहते हैं। ये वृहत 6 पोषक नाइट्रोजन, फॉस्फोरस, पोटैशियम, कैल्सियम, मैग्नीशियम और सल्फर हैं।

फसल की सुरक्षा के लिए निरोधक विधियाँ तथा जैव नियंत्रण क्यों अच्छा समझा जाता हैं?

फसल की सुरक्षा के लिए निरोधक विधियाँ तथा जैव नियंत्रण इसलिए अच्छा समझा जाता हैं ताकि उत्पाद को हानि पहुँचाने वाले जैविक कारक जैसे कीट, कृंतक, कवक, चिंचडी तथा जीवाणु आदि मर जाएँ और भंडारण के बाद भी उत्पाद की गुणवत्ता कायम रहे।

पशुओं की नस्ल सुधार के लिए प्रायः कौन-सी विधि का उपयोग किया जाता है और क्यों?

पशुओं की नस्ल सुधार के लिए प्रायः संकरण विधि का उपयोग किया जाता है। इस विधि में देशी (रोग प्रतिरोधक क्षमता) और विदेशी (लंबा दुग्ध स्त्रवणकाल) नस्लों के बीच संकरण कराने पर संकल नस्लें उत्पन्न होती हैं जिसमें दोनों के एच्छिक गुण (रोग प्रतिरोधक क्षमता तथा लंबा दुग्ध स्त्रवणकाल) होते हैं।

How do good animal husbandry practices benefit farmers?

Cattle farming is one of the methods of animal husbandry that is most beneficial for farmers. Using this method, better breeds of draught animals can be produced. Such draught animals are engaged in agricultural fields for labour work such as carting, irrigation, tilling, etc.

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

The common factor for increasing production in poultry, fisheries, and bee keeping is the proper management techniques that are to be followed. Regular cleaning of farms is of utmost importance. Maintenance of temperature and prevention and cure of diseases is also required to increase the number of animals.

ब्रौलर तथा अंडे देने वाली लेयर में क्या अंतर है?

ब्रौलर तथा अंडे देने वाली लेयर में अंतर:
ब्रौलर के आहार में प्रोटीन तथा वसा की मात्रा अधिक होती है। जबकि लेयर के आहार में प्रोटीन, वसा के साथ साथ विटमिन A तथा विटमिन K की मात्रा भी अधिक रखी जाती है।
ब्रौलर को मास के लिए पाला जाता है। जबकि लेयर को मुख्यतः अंडों के लिए पाला जाता है।
इनके चूजों की वृद्धि तीव्र होती है। जबकि लेयर के चूजों की वृद्धि अपेक्षाकृत धीमी होती है।