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.

Apart from good quality seeds, using appropriate agricultural practices are important for getting higher yield. Mustard is a rabi crop that is sown in beginning of winters (October-November) as they need low temperature and harvested at the end of winter (April-May). It actually enriches the soil. Different crops utilizes different nutrients which permits the replenishment of used nutrients. This method is also called as crop rotation.

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.

Here, all the statements are associated with seed drill. Hence, your answer will be option [D].

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.

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.

Soil supplies mineral nutrients to the crop. These nutrients are essential for the growth of plants. The use of manure improves soil texture as well as its water retaining capacity. It replenishes the soil with all the nutrients. Another method of replenishing the soil with nutrients is through crop rotation. This can be done by growing different crops alternately.

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].

Flood irrigation is required only for paddy crop. Fields are irrigated from time to time to save the crop from drought. Paddy (rice) is only crop of saplings which are planted in flooded fields. Even paddy is watered sparingly towards the maturation of the crop.

The ploughed field may have big pieces of soil called crumbs. It is necessary to break these crumbs with a plank. The field is levelled for sowing as well as for irrigation purposes. The levelling of soil is done with the help of a leveller.

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).

Fertilisers are chemical substances which are rich in a particular nutrient. Some examples of fertilisers are urea, ammonium sulphate, super phosphate, potash, NPK (Nitrogen, Phosphorus, Potassium). The use of fertilisers has helped farmers to get better yield of crops such as wheat, paddy and maize.

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.