Improvement in Food Resources Class 9 Worksheet Science Chapter 12

Q.1. Fill in the blanks

(i) Foreign breeds of animals are also known a Exotic breeds .
(ii) Tallness and profuse branching are the desired characters in Fodder type of crops.
(iii) Richest component in cereals is Carbohydrates .
(iv) Genetically modified crops are produced by introducing a Gene coding for desired character in plants.
(v) Out of sixteen essential nutrients, thirteen are provided by Soil to the plants.

Q.2. Which of the following statement is true?
(a) Exotic breeds of cattle are selected for long lactation periods
(b) Local breeds of cattle are selected for long lactation periods
(c) Exotic breeds of cattle are selected for high resistance for diseases
(d) Local breeds of cattle are selected for low resistance for diseases

Correct Answer is Option (a)

Q.3. Which one of the following fish is a bottom feeder?
(a) Rohus
(b) Mrigals
(c) Grass carps
(d) Catlas

Correct Answer is Option (b)

Q.4. Taste and quality of honey depends upon:
(a) Pasturage
(b) Type of flowers available
(c) Pollen collection
(d) All of these

Correct Answer is Option (d)

Q.5. Which of the following is a gaseous fumigant?
(a) Methyl Bromide
(b) Ethylene dichloride
(c) DDT
(d) Potassium chloride

Correct Answer is Option (a)

Q.6. What are the hazards of using fertilizers?

Effects of using fertilizers:

• Effect on soil quality: continued use of fertilizers leads to a loss of organic matter, a deterioration of soil structure.
• Eutrophication: Excessive use of fertilizers build up nitrates on the soil.

Nitrates and phosphates are washed by rain and carried to lakes, ponds and rivers and causes excessive growth of plants of algae. Algae deplete the oxygen content of the water body.

Q.7. What are the main practices involved in keeping of animals or animal husbandry?

Main practices involved in animal husband day:

• Breeding – It is done to obtain animals with desired characters. Breeding can develop high milk yielding and high meat-yielding animals.
• Feeding – It deals with the study of proper food (called feed), mode and time of feeding of different animals.
• Weeding – It is elimination of uneconomical animals.
• Heeding – It means the proper care and management of animals.

Q.8. How do good animal husbandry practices benefit farmers?

Animal husbandry is the scientificmanagement of animal livestock. It includesvarious aspects such as feeding, breeding anddisease control.
As the population increases and asliving standards increase, the demand formilk, eggs and meat is also going up. Also,the growing awareness of the need for proper treatment of livestock has broughtin new limitations in livestock farming. Thus,livestock production also needs to beimproved. This improvement can be brought about by good animal husbandry practices like providing good food and preventing diseases in the cattles that will benefit farmers to obtain better quality and quantity products.

Q.9. What is hybridization?

Hybridization refers to the crossing between genetically dissimilar plants. In this method, the two crop verities are selected, each with at least one of desired characteristics such as high-yield or resistance to disease.

Q.10. For increasing production, what is common in poultry, fisheries and bee-keeping?

For increasing production, steps that are common in poultry, fisheriesand bee-keeping are as follows :

• Good varieties/breeds are used.
• Good nutritious food is provided.
• Hygienic conditions/cleanliness is taken care of

Q.11. How do biotic and abiotic factors affect crop production?

The biotic factors include living organisms like honey bees and earthworms who help in better crop production while pests(insects and rodents) and microbes that produce bad effect on crop production.

The abiotic factors are the climatic conditions and non living natural resources like soil, water and air. They also affect crop production since favourable conditions of temperature, humidity and mineral nutrition improve crop production.

Q.12. What factors may be responsiblefor losses of grains duringstorage?

Factors that may be responsiblefor losses of grains duringstorage are :

• Abiotic factors: Unfavourable conditions of humidity and temperature.
• Biotic factors: Insects, rodents, bacteria, fungi etc that feed on grains.

Q.13. Why should preventive measures and biological control methods bepreferred for protecting crops?

Prevention is better than cure so is true for plants also. Such preventions involve spraying of herbicides, weedicides, insecticides, pesticides, fungicides etc in the crop field.
Since their excessive use can harm the crop plants and cause pollution so proper seed bed preparation, timelysowing of crops, intercropping and croprotation are additionally applicable. Other than these biological control methods like use of resistant varieties is highly useful.

Q.14. What is pasturage and how is it related to honey production?

Pasturage refers to the flowers availableto the bees for nectar and pollen collection.The value or quality of honey depends upon the pasturage. Along with this the kind of flowers available will determine the taste of the honey.

Q.15. What are the advantages of organic farming?

Advantages of organic farming are:

• Natural ecosystem is not disturbed
• Soil fertility is preserved.
• Harmful effects of chemicals on the living organisms are avoided
• Pollution of air, water and soil does not take place.