Ncert solution class 8 science ch-1 crop production and management.


Ncert solution class 8 science ch -1 crop production and management.

science book
book

questions 1 to 5.

Q 1.fill in the blanks.

Get NCERT solution for Class 8 Science chapter 1. These NCERT solutions for science 8 include detailed answers to all questions in chapter 1 - Crop Production and Management provided in the NCERT Book for Schools in Class 8 is defined.
Answer:
(a) crop
(b) preparation
(c) float
(d) water and nutrition

Q 2.match the column 'A' and 'B'.
Answer:
       'A'                          'B'

(i) kharif crops------- paddy and maize
(ii) rabi crops--------- wheat,gram,pea
(iii) chemical fertilisers-- urea and super phosphate
(iv) organic manure------- animal excreta,cow dung,urin and plant waste.

Q 3.Give two example of each:-(a) kharif crops  (b) rabi crops.
Answer:(a)padyy and maize.
               (b)wheat and gram.

Q 4.Write a paragraph in your own words on each of the following.
(a) Preparation of soil (b) Sowing(c) Weeding (d)Threshing .
Answer:
(a) This is the first method before growing the crop. This method is usually employed to loosen soil so that the root can penetrate in depth. Soil erosion helps in the development of many soil microorganisms, earthworms, which enrich the soil with humidity and other essential nutrients. Plants need nutrients for their proper development and functioning. The process of looseness is called soil tilling or cultivation. Tiling of soil brings nutrient rich soil to the top. It helps plants to use nutrients for their development.

(b) Sowing in crop production is another important step. For the future development, it is the process of planting seed in soil or soil. The seeds selected to grow should be of good quality. This will improve the net yield of the crop. Sowing is usually done with the help of conventional equipment or seed drill. The traditional equipment is shaped like a funnel. It was used before sowing seeds. Nowadays, seed drill which uses tractors, is used for planting seed. This tool spreads the seeds evenly and sows seeds at the proper depth. By this method sowing saves time and protects the seeds from birds.

(c) The undesirable plant growing with the crop is known as weed. Weed is the process of removing these weeds. Xanthium, Parthenium, etc. are some common weed. Weeds compete with the crop for nutrients, light and space. Consequently, crop plants get less nutrients, light and space for their development. In turn, their productivity decreases. Thus, different weed methods are employed.
Some important weed methods are:
(i) Weeds can be controlled using weeds. It is a chemical, which is thrown into the fields to kill all available melons. Weeds are not harmful for crops.
(ii) Tilling before sowing crops also helps to remove melons. To remove melons. Before producing flowers and seeds, it is best time to remove the weed.
(iii) The manual method of removal of weed is with the help of Khurpi. There are regular bites or cutting of weeds near the ground.

(d) Threshing is the process of separating cereals or seeds. This is done after harvesting. This is usually done with the help of a machine known as 'combination'. This machine is a combined harvester and thrasher. It yields plants as well as cleans grains.

Q 5.Explain how fertilisers are different from manure.
Answer:
Fertiliser:-Fertilizer Commercially plant nutrients are available.They ensure the healthy growth and development of plants by providing nitrogen, phosphorus, potassium etc.To be extra in the soil, special guidelines like dosage, post extra precautions, etc. are required.

Manure:- Manure is a natural substance prepared by animal emissions and decomposition of plant waste.They help in enriching the soil with organic matter and nutrients.No special guidelines are required except for composting.

questions 6 to 11.

Q 6.What is irrigation? Describe two methods of irrigation which conserve water.
AnswerIrrigation is the process by which water is supplied to crops at different intervals. The time and frequency of irrigation varies according to different seasons, crops and soil types. There are various sources of irrigation like wells, canals, rivers, dams, ponds and lakes.
Two methods of irrigation which help to conserve water:
A) Sprinkler System:
This system is more useful on uneven land, which has less water supply. In this method, water is supplied using pipes at one or more central locations within the area. When the water is allowed to flow in high pressure with the help of a pump, then it is sprinkled on crops.
B) drip system:
In this system, water is distributed to or near the roots of plants, falls off the drop. This is the most effective method of irrigation because there is no waste of water. This method is important in areas where availability of water is bad.

Q 7.If wheat is sown in the kharif season, what would happen? Discuss.
AnswerIf wheat is sown in the kharif season (from June to October), then due to many factors like optimum temperature, favorability, availability of pests, etc., the entire crop may be destroyed. Kharif season includes rainy season, which is not conducive to the development of wheat crop. Therefore, during this season wheat crop should not be sown.

Q 8.Explain how soil gets affected by the continuous plantation of crops in a field.
AnswerContinuous plantation of crops in one area spoils the soil in some nutrients such as nitrogen, phosphorus, potassium etc. Plants need nutrients for their proper development and functioning. When a farmer grows after each other, all the nutrients available in the soil are reduced and the crop yield automatically decreases.

Q 9.What are weeds? How can we control them?
AnswerThe undesirable plant growing with crop plants is known as weed. Xanthium, Parthenium, etc. are some common weed. Weeds compete with the crop for nutrients, light and space. Consequently, crop plants get less nutrients, light and space for their development. In turn, their productivity decreases. Thus, different weed methods are employed.
Some important weed methods are:
(I) Weeds can be controlled using weeds. It is a chemical, which is sprayed
In the fields to kill all available melons. Weeds are not harmful for crops.
(ii) Tilling before sowing crops also helps to remove melons. To remove melons. Before producing flowers and seeds, it is best time to remove the weed.
(iii) The manual method of removal of weed is with the help of Khurpi. There are regular bites or cutting of weeds near the ground.

Q 10.Arrange the following boxes in proper order to make a flow chart of sugarcane crop production.
Answer:
Preparation of soil > ploughing the feild > sowing > manuring > harvesting > sending crop to sugar factory.

Q 11.complete the following puzzle. 
Answer:-
Down:
1.IRRIGATION 
2.STORAGE
5.CROP
across:
3.HARVESTOR
4.GRAM
6.WINNOWING 


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