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 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. NCERT Solutions Apps 2020-21 based on Updated NCERT Book Solutions 2020-2021 for class 9 all subjects are also available.
NCERT Solutions for Class 9 Science Chapter 15
|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.
9th Science Chapter 15 Answers English Medium
9th Science Chapter 15 Answers Hindi Medium
9th Science Chapter 15 Answers in PDF
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?
(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.
(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
What are the differences between broilers and layers and in their management?
(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.
(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.
If there is low rainfall in a village throughout the year, what measures will you suggest to the farmers for better cropping?
(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
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।
अजैविक कारक (सुखा, पाला, क्षारता, गर्मी आदि) फसल को आंशिक या पूर्णतया नष्ट कर देते हैं।
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।