Board | RBSE |
Class | Class 8 |
Subject | Science |
Chapter | Chapter 1 |
Chapter Name | Agriculture Management |
Number of Questions Solved | 43 |
Category | RBSE Solutions |
I. Multiple Choice Questions
Question 1.
Answer:
Question 2.
Fill in the blanks:
Answer:
Question 1.
What is a crop?
Answer:
Plants are grown after a fixed intervals of time to fulfill the needs of food of human beings and animals are called crop plants. While plants that are grown in a particular season are called crops.
Question 2.
Give two examples each of Rabi, Kharif, and Zaid crops?
Answer:
Rabi- wheat, gram,
Kharif- maize, groundnut
Zaid- watermelon, kakri
Question 3.
What is threshing?
Answer:
After harvesting it is derived to eliminate moisture. Then seeds is seperated from the husk, it is called threshing.
Question 4.
What are the sources of irrigation?
Answer:
Sources of irrigation are
(a) Traditional sources- chadas, handpump. dhekli.
(b) Modern sources- hand pump, electric pump, diesel pump.
Question 1.
What are the modern techniques of irrigation? Describe them.
Answer:
The modern techniques of irrigation are
(a) for unlevelled land – sprinkler system
(b) for levelled land – drip system.
Question 2.
What problems does a farmer face while cultivation? What method would you suggest overcome those problems?
Answer:
Protection of crops – Problem of crops or need to protect
I. Multiple Choice Questions
Question 1.
Which of the following is a cash crop?
(a) Maize
(b) Rubber
(c) Mustard
(d) Pea
Question 2.
Which among the following is not a Rabi crop?
(a) Wheat
(b) Pea
(c) Cotton
(d) Gram
Question 3.
The nitrogen deficiency in the soil can be made up by:
(a) crop rotation
(b) ploughing
(c) harvesting
(d) broadcasting
Question 4.
Organic nutrients are called:
(a) fertilizers
(b) manure
(c) both (a) and (b)
(d) none of these
Question 5.
For safe storage of cereal grains, moisture content of the grains should not be more than:
(a) 84%
(b) 4’4%
(c) 34%
(d) 14%
Question 6.
Supply of water to crops at appropriate interval is called:
(a) irrigation
(b) cultivation
(c) sowing
(d) harvesting
Question 7.
Sprinkler irrigation is best suited for:
(a) loamy soil
(b) clayey soil
(c) sandy soil
(d) both (a) and (b)
Question 8.
Cutting and collecting mature crop is called:
(a) broadcasting
(b) crop rotation
(c) horticulture
(d) harvesting
Question 9.
The process of separating grains from stalk and grains from the husk and chaff respectively are
(a) winnowing and threshing
(b) threshing and winnowing
(c) ploughing and winnowing
(d) winnowing and ploughing
Question 10.
Which of the following is not an agricultural implement?
(a) Plough
(b) Hoe
(c) Sickle
(d) Plumbline
Question 11 .
The practice of sowing seeds by hand is known as-
(a) spreading
(b) broad casting
(c) both (a) and (b)
(d) none of these
Question 12 .
Which instrument is used for spraying weedicides?
(a) plough
(b) sprayer
(c) cultivator
(d) combine
Question 13.
Rice is a:
(a) Rabi Crop
(b) sprayer
(c) Zaid Crop
(d) combine
Question 14.
Example of Rabi crop is
(a) jowar and maize
(b) moong and urad
(c) wheat, chana and peas
(d) watermelon and cucumber.
Question 15.
Harvesting is used for:
(a) cutting crops
(b) irrigation
(c) removing weeds
(d) sowing weeds
Answers:
1. (b)
2. (c)
3. (a)
4. (b)
5. (d)
6. (a)
7. (c)
8. (d)
9. (b)
10. (d)
11. (b)
12. (b)
13. (b)
14. (c)
15. (a)
Question 1.
What is agriculture?
Answer:
Agriculture is a branch of science dealing of plants and raising of animals which are useful to us in the field.
Question 2.
What are crumbs?
Answer:
The ploughed field may have big pieces of soil called crumbs.
Question 3.
What is manure?
Answer:
Manures are organic substances obtained by the decomposition of dead and decaying matter and used for enriching the soil.
Question 4.
Name the tasks involved in agriculture?
Answer:
Tasks involved in agriculture are preparation of soil, manuring, sowing, irrigation, crop protection, harvesting and storing.
Question 5.
What is tilling?
Answer:
The process of loosening and turning the soil is called tilling or ploughing.
Question 6.
How is threshing done?
Answer:
Threshing is done with the help of a machine called thrasher or motorised machine called combine. These separate the chaff from grain.
Question 7.
Why food materials are stored?
Answer:
The need for storage of food materials to provide seasonal fruits throughout the year to each citizen at every place of the country.
Question 8.
Define weeding.
Answer:
It is a process of removing unwanted plants from crop or ornamental plants.
Question 9.
Name the sources of irrigation?
Answer:
Water is supplied to fields from a number of sources rain, wells, tubewells, lakes, ponds, rivers, canals and dams.
Question 10.
When was Prof. M. S. Swaminathan awarded?
Answer:
Prof M. S. Swaminathan received Padma Shree award in 1967, Padma Bhushan in 1972 and Padma Vibhushan in 1989 by Indian government.
Question 1.
Classify the crops on the basis of their uses.
Answer:
Classification of the crops on the basis of their uses:
Question 2.
What is a hoe? Write its uses?
Answer:
Hoe is a simple tool which is used to remove weeds and for loosening the soil. It has a long rod of wood or iron. A strong, broad and bent plate of iron is fixed to one of its ends and works like a blade.
Question 3.
In which district of Rajasthan, wheat, barley, moth, gram are grown?
Answer:
Main crops grown in different districts of Rajasthan:
Question 4.
What is a cultivator?
Answer:
Cultivator is an agricultural implement which is driven by tractor and is used in ploughing. It saves time and labour.
Question 5.
Why do farmers use manures and fertilizers in their fields?
Answer:
Manure and fertilizers are major supplier of nutrients to the plant so to make soil fertile, farmers add manures and fertilizers.
Question 6.
Write the seasons for cultivating crops in India.
Answer:
There are two main seasons for cultivating crops in India. These are the Rabi and the kharif seasons.
Question 1.
Explain the activities involved in cultivation of crops.
Answer:
Cultivation of crops involve the following activities:
Question 2.
Describe the traditional method of irrigation.
Answer:
Traditional methods of irrigation: Different methods are used for lifting water up for irrigating the fields in different regions of our country. In some of the methods, cattle or human labour is used. Such methods are cheaper but less efficient. These days, pumps are used for lifting water. Diesel, electricity or even solar energy may be used to run the pumps.
The different traditional methods of irrigation are:
Question 3.
Explain the differences between manures and fertilisers?
Answer:
Differences between manures and fertilisers.
Manure:
Made naturally from plant and animal wastes by the action of microbes.
Fertilisers:
Question 4.
How does crop effect the environment?
Answer:
Crops directly effect the environment in the following ways :
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