Worksheet solutions for chapter: Crop Production and Management for class 8 are provided below.
(1) Give two examples of kharif and rabi crop.
Examples of kharif crop- Paddy and cotton
Examples of rabi crop – Wheat, pea
(2) Explain one traditional method of irrigation.
Moat is a traditional method of irrigation. Moat or pully system is a very old system of irrigation. In India it is popularly known as ‘Ghiri’.In this system, a pully or ghiri is placed on the well with a rope. The one end of this rope is keep free to pull water from the well. A bucket is tied on the other end of the rope to pull water. When we lose the rope, bucket moves into the well. When we pull rope towards us, bucket came out from well with water in the bucket. It is easy to pull bucket through pully because it changes direction of force or load.
(3) Explain one method of irrigation which conserve water.
Sprinkler system is a water economic method of irrigation. Sprinkler system is a system which can be used on water deficient land easily and effectively. Pipes are connected with each other perpendicularly on a main pipe at regular intervals. These pipes have rotating nozzles to sprinkler water in all directions. Water flows through main pipe with the help of pump. This water sprinkled on the crop. It is a very good system for sandy soil.
(4) Write steps of crop production.
Steps of crop production-
(i) Preparation of soil
(iii) Adding manure and fertilizer
(v) Protecting from weeds
(5) What are weeds and how can we control them?
Weeds are undesirable plants which grow along with crop. The processes in which weeds are removed are known as weeding. We can control weeds by tilling the soil before sowing crops. Weedicides (chemical) can be sprayed on the weeds after diluted with water. Weedicides do not damage the crop.
(6) Why seeds should be sown at proper distance?
Seeds should be sown at proper distance to avoid overcrowding of plants. Sometimes some plants have to remove from the field to control overcrowding of plants. Plants at proper distance can get sufficient sun light , nutrients and water which are very necessary for the growth of the plants.
(7) Fill in the blanks:-
(i) …… is used to remove weeds in the fields.
(ii) The crops grown in the winter season are known as ….. crop.
(iii) …… is a machine used in sowing seeds.
(i) Weedicides is used to remove weeds in the fields.
(ii) The crops grown in the winter season are known as Rabi
(iii) Seed drill is a machine used in sowing seeds.
(8) Why irrigation is necessary for crops?
Irrigation is the system to supply water in the fields for crops at appropriate intervals. Water is very necessary for proper growth of plants. Plants contain nearly 90% of water.
Importance of irrigation for plants:-
(i) Roots of plants absorbed water. They also absorbed minerals and fertilizers with water.
(ii)Germination of seeds cannot take place without water.
(iii)Nutrients dissolved in water get transported to the each part of the plant.
(iv) Frost and hot air current damages plant. Watering plant can prevent damage in winter and summer. In winter water on the surface of plant convert into solid state,ie,snow. The conversion of the water from liquid state to solid state releases energy in the form of heat. This heat keeps plant warm.
In summer plants releases water due to transpiration .So, watering in summer keep plants cool.
(9) Explain drip system of irrigation. Why is it good for irrigation?
It is a modern technique for watering plants. In this system water reached to the roots drop by drop. Pipes are spread in whole field with small holes or small pipes. Water flows in the main pipe and reached drop by drop to the roots of plants with out wasting water.
Drip system of irrigation is good for sandy soil . This system is good for regions like desert where water is not available in sufficient quantity.
(10) Define crop. How many types of crops are grown in India?
When same kind of plants are grown and cultivated at same place in large quantity, are known as crops.
Eg :- Cereals, vegetables, fruits.
Types of crop in India-
India has different climatic condition (temperature, humidity and rainfall), so it has different crops at different places in different seasons. Crops can be divided in two broad pattern based on the season. These are explained below:
(i) Kharif Crops:-
(a) It is sown in rainy season, ie, June to September.
(b) Name of Kharif crops – Paddy, maize, soyabean, groundnut, cotton etc.
(ii) Rabi Crops:-
(a)It is grown in winter season, ie, October to March.
(b) Name of the Rabi Crops:- Wheat, gram, pea, mustard, linseed etc.
(iii) Pulses and vegetables are grown during summer at many places.