Crop Production And Management /CBSC Class 8 NOTES
Hello friends, in this article we have given questions related to class 8 science chapter 1 extra questions of cbsc / ncert – whose topic is – Crop Production And Management /CBSC Class 8 NOTES
1. Agriculture – Growing plants and rearing animals for good , clothing and other useful products is called agriculture.
2. Crops- Plant of the same kind grown on a large scale good , clothing etc. are called crops.
3. Ploughing – The process of loosening and turning the soil is called ploughing.
4. Fertilizers- Natural or chemical substances that contain one or more nutrients essential for plat growth are called fertilizers.
5.Irrigation- Artificial application of water to soil for assisting the growth of crops is called Irrigation.
6- weeding- The process of removing weeds is called weedicides.
7- Pesticides- Chemicals used to destroy pests are called pesticides.
8- Animal husbandry- Rearing animals on a large scale , for good and other needs , is called animal husbandary.
Q1- Mention any five reason to show the importance of Ploughing .
Q 2- Differentiate between ploughing and levelling.
The process of loosening and turning the soil is called ploughing
After ploughing , big Lumps of soil (called clods) may remain in the field. these are crushed using wooden oriron planks called levellers and this process in called levelling.
Q 3- what are fertilizers ? How do they helps the soil ?
Ans- Fertilizers are natural or chemical substances that contain one or more nutrients essential for plant growth.
Q 4- What are the points to be kept in mind while showing sheets?
Answer- the following. Must be kept in mind while sowing seeds.
1- seeds should be sown at appropriate distance from one other.
2- seeds should be sown at the correct depth, neither to be shallow not too Deep.
Q 5- what does nSC stand for? What is it involved in?
Ans- in India a government body call the national seeds corporation is involved in the production good quality agricultural seeds. NSE has also so helped up in setting up seed testing taboratories in different parts of the country.
Question 6- what is irrigation? Describe the two two methods of irrigation?
Answers- irrigation refers to artificial application of water to the soil for assisting the growth of crops.
1- sprinkler irrigation- is a method that involve pumping water under pressure throw nozzle and spraying. It over soil like artificial rain. This method is particularly effective for irrigating uneven land and areas having sandy soil.
2- Drip irrigation- Is a method that involves the the use of pipe or tube with very normal holes to deliver water drop-by-drop directly at at the base of of each plant. This method is very e useful for areas having a shortage of water.
Qus7- different between mixed cultivation and crop rotation?
1- mixed cultivation- In which type of cultivation, two or more different type of Crop are sown in a particular field at the same time.
2- crop rotation- the practice of growing two or more more dissimilar in the same field, one after the other, is called crop rotation.
Qus8- describe good products that we get from animals?
answer- we obtain many kinds of food items from animals. Rearing animals on a larger scale, for good and other needs, is called animal husbandry. Here are some example of good products obtained from animals.
* milk is obtained from animals such as cows, buffalo and goats. It is used to to prepare a variety e off products such as butter,ghee,courd, and cheese.
* meat is obtained from animals such as goats and chicken. People also eat many kind of fish, prawns, shrimps, lobster, and other sea animal.
* egg are obtained from words such as hands, turkey and geese.
* honey is obtained from honeybees.
Qus9- describe in detail how soil is prepared before sowing seeds?
Ans- soil preparation involves plugging, levelling, and applying fertilizers.
* plugging- The process of losing and turning the soil is called plugging and telling.
* levelling- after plugging, big lumps of soil called how many remain in the field.
* applying fertilizer- farmer apply fertilizer to provide plant with essential nutrients.
Qus-10- different between chemical and natural fertilizers?
1-natural fertilizers- these are obtained from plant and animal wastage.
2- these increase the humus content of the soil.
3- example are manure, composed, bonn meal mixture of Crushed and coarsely ground bones and bark of neem.
* chemical fertilizers
1- these are chemical substance produce in fertilizer.
2- these do not increase the humus content of the soil.
3- example are are urea, ammonium sulphate, poltas and Npk cnitrogen, phosphorus, potassium fertilizer.
Qus-3- showing can be done manually with the help of an implement called seed drill ?
* manually sowing- this process (also called broadcasting) involves direct sprinkling of seeds into the soil for digging the soil and planting the seeds.
* using a seed drill- aseed drill can be pulled across the the field using tractor.
Qus4- how do farmers protect there crop from weeds?
ans- wedding can be done adam annually or by using chemical called weedicides.
* manual weeding- can be uprooted either by hand aur with the help of implement such as harrow trowel, and hoe.
* using weedicides- a weedicide is a a chemical that is used to destroy weeds. Without affecting the crops. Dalpon, metachlor, and siziazine, are example of of wheaticides.
Qus-5- describe how the practice of mixed cultivation and crop rotation help in increasing the crop field?
ans- mix cultivation- the crop chosen are such that nutrient needs of one crop are are fulfilled by the other. For example- aleguminous plant, a plant having seed in long pods such as chickpea or mustard can be grown in the same field, along with a a cerial such a wheat.
* crop rotation- this is done keeping in mind the the nutrient equipment of a particular crop. For example- crops such as wheat and paddy use up a lot nitrogen from the soil. If lost nitrogen can be replaced naturally if leguminous plants sach as pea, soya bean aur green beans are sown offers wheat or paddy.