Class 8 Science Chapter 1 MCQ

Ploughing of the soil during soil preparation creates spaces in the soil thus, leading to aeration and the soil also loosens which promotes the growth and survival of earthworms and microbes and release of nutrients in the soil.

The science of rearing, caring, breeding and improvement of domestic animals is known as “Animal Husbandry”. It is the practice of breeding and raising livestock like cows, buffaloes, pigs, horses and sheep etc. This practice requires good care and management of livestock.

If the field is dry for cultivation of crops, the soil preparation is done accordingly before sowing of crops. Preparation of dry soil includes adequate watering to restore the moisture content and then tilled and ploughed to allow growth of microbes and aeration. Finally, soil is turned and its crumbs are levelled and manures are mixed. The soil is ready for sowing of crops in the field.

The ginger is a modified underground stem, which is propagated vegetative by stem (rhizome) cultivation. It does not propagate by roots, leaves or seeds.

Here, all the statements are correct except option [D]. Fertilizers are the sources of water and soil pollution. Manure is an organic substance and using of it is considered better than fertilizers. Hence, your answer will be option [D].

Organic manure are obtained from decomposition of plant and animal wastes that are rich in nutrients and humus. But all nutrients might not be present in a proportionate amount in it, thus will not solve the problem if soil is particularly deficient in one or more specific nutrient.

Fish is good for health, we get cod liver fish oil from fish, which is rich in Vitamin-D.

The process of separating the edible part of the harvested grains (crop) by loosening and removing the scaly, inedible chaff surrounding the grain. The process utilizes a machine called “combine” which is combination of harvester and a thresher.

Here, all the options are correct. Hence, your answer will be option [D]

In a field many other undesirable plants may grow naturally along with the crop. These undesirable plants are called weeds. The removal of weeds is called weeding. Weeds are also controlled by using certain chemicals, called weedicides.

Conversion of dead decaying matter into ammonia and then into nitrites and nitrates by nitrifying microbes, called “Nitrification”. Conversion of air nitrogen into nitrites and nitrates by nitrogen microbes, called “Nitrogen fixation”. Conversion of nitrites and nitrates from decaying organic matter into gaseous nitrogen by denitrifying microbes, called “Denitrification”.

“Ager” meaning field or soil, “cultura” meaning cultivation. Agriculture is the cultivation of the soil. It includes growing of plant crops and rearing of animals.

Hoe is a simple tool used for removing weeds from the field and loosening of soil, it works like a blade, pulled by the animals in the field. Plough is used for tilling of soil; axe is used for cutting trees and cultivator is another tool implemented for ploughing.

Dried neem leaves are added to stored grains, so as to prevent damage from pests. Hence, your answer will be option [D].

Seeds placed deep into the soil may fail to germinate. Rest, all the statements are correct. Hence, your answer will be option [D].

Option A is correctly suggesting the harmful effects of weeds. Weeds are the undesirable plants that grow along the main crops. Removal of weeds is necessary because they interfere and affect the major crop’s growth, by competing for light, water, nutrients and space. They also interfere during harvesting procedure. Weeds do not help in healthy growth of crop plants.

Swaminathan has been called the “Father of Green Revolution in India” for his role in introducing and further developing high-yielding varieties of wheat in India. He is the founder of the MS Swaminathan Research Foundation also.

The process of loosening and turning of soil is called tilling and ploughing. It is the first step, in preparation of soil for cultivation of crop. Ploughing is done using a plough, made of wood or iron.

The supply of water to crops at different intervals is called irrigation. Pulley system, chain pump, dhekli and rahat (Lever system) are traditional methods of irrigation whereas sprinkler system and drip irrigation are the modern methods of irrigation.

The preparation of soil is the first step before growing a crop. One of the most important tasks in agriculture is to turn the soil and loosen it. This allows the roots to penetrate deep into the soil. The loose soil allows the roots to breathe easily even when they go deep into the soil.

Here, all the options are correct (may include in possibilities). Hence, your answer will be option [D].

The monsoon season in India is during the months June to September. The crops grown in this season are called kharif crop, e.g. paddy, maize, cotton etc. The kharif crops sown in June are harvested towards the end of rainy seasons (October to November).

Paddy, maize, soya-bean, groundnut, cotton, etc., are kharif crops. Rabi crops are wheat, gram, pea, mustard and linseed. Thus, wheat is not associated in kharif crops. So, your answer will be option [D].

Here, all the options are associated with animal husbandry. Hence, your answer will be option [D].

Drip system is the method of irrigation which conserve water and avoids wastages as water is made to fall drop by drop at the position of roots. It is the best technique for watering fruit plants, trees and gardens. Sprinkler system is also a modern method of irrigation that efficiently uses of water in the form of sprinklers. It is useful for uneven lands, while pulley and lever systems are traditional methods of irrigation where a lot of water is wasted.