Class 8 Science Chapter 1 MCQ

Some crop plants need transplantation, not all. Rest of all statements are correct. Hence, your answer will be option [C].

Maize is a kharif crop which requires high temperature, rainfall and humidity to grow, while rabi crops require low temperature for their growth.

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.

Harvesting is a process of cutting matured crops from close to the ground. It is done manually using a sickle.

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.

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

Manure is a natural substance obtained by the decomposition of cattle dung, human waste and plant residues. It provides a lot of humus to the soil. Manure is relative less rich in plant nutrient but using this no pollution occur and it improves the soil texture also. Thus, as an organic component cattle dung is very important for the nutrients of plants.

Irrigation is the supply of water to crops at regular intervals as water or moisture is necessary for seed germination, growth and other physiological processes. Moreover, the plants readily absorb nutrients in dissolved from along with water through root hairs of roots. It does not protect crops from frost and hot air currents and manure not irrigation improves soil texture.

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].

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.

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.

Weedicides are sprayed during the vegetative growth of weeds “before” flowering and seed formation. Rest, all the statements are correct. Hence, your answer will be option [D].

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.