Online Test Of Science Chapter 1 Class -VIII

Irrigation is the correct answer because it refers to the supply of water at regular intervals in agricultural fields. This process is essential for the growth and development of crops as it provides them with the necessary moisture and nutrients. Sowing, manuring, and tilling are all important agricultural practices, but they do not specifically involve the regular supply of water. Therefore, irrigation is the most appropriate term to describe this process.

When the plants of the same kind are planted on a large scale over a piece of land, it is referred to as crops. This term encompasses all types of plants that are cultivated for various purposes, including food, fiber, and medicinal uses. The term "crops" is a general term that can include both Kharif crops (which are sown in the rainy season) and Rabi crops (which are sown in the winter season). Therefore, "crops" is the most appropriate answer as it encompasses both types of crops and does not exclude any specific category.

The correct answer is viruses because nCOVID-19 is caused by the novel coronavirus, which is a type of virus. Viruses are microscopic infectious agents that can only replicate inside the cells of a living organism, and they are known to cause various diseases in humans, including COVID-19. Bacteria, protozoa, and insects are not casual organisms of nCOVID-19.

Ploughing is the correct answer because it involves the act of loosening and turning the soil. This process is typically done using a plough, which cuts through the soil and flips it over, exposing fresh soil and burying any weeds or crop residue. Ploughing helps to break up compacted soil, improve drainage, and create a suitable seedbed for planting. Broadcasting refers to the act of scattering seeds or fertilizer over a wide area, irrigation is the process of supplying water to crops, and levelling involves creating a flat and even surface.

Social distancing is the means to stop the spread of nCOVID-19. This involves maintaining a physical distance of at least 6 feet from others, avoiding crowded places, and minimizing close contact with people who are sick. By practicing social distancing, the chances of transmitting the virus through respiratory droplets are reduced, thereby slowing down the spread of the disease. Touching here and there, eating together, and praying to God do not directly contribute to stopping the spread of nCOVID-19.

Agriculture is the earliest learned science by human beings because it involves the cultivation of plants and the domestication of animals for food, which has been practiced for thousands of years. This knowledge was essential for survival and led to the development of various agricultural techniques and practices. In contrast, the production of antibiotics, vaccines, and the invention of the microscope are relatively recent advancements in science and technology.

Wheat and gram belong to Rabi crops because Rabi crops are sown in winter and harvested in spring. Wheat and gram are both winter crops that are sown in the winter season and harvested in the spring season. Therefore, the correct answer is Rabi crops.

Agriculture does not depend on the people of a place because it can still be carried out even if there are no people present. Factors such as humidity, soil type, and climate are essential for agriculture as they directly affect the growth and productivity of crops. However, the presence or absence of people does not determine whether agriculture can take place or not.

Levelling the best refers to the process of breaking lumps of soil after ploughing. This is important because ploughing can leave the soil uneven and clumpy, which can hinder plant growth and make it difficult to sow seeds. Breaking up the lumps of soil helps to create a smooth and level surface, ensuring that the seeds can be evenly distributed and have better contact with the soil for optimal germination and growth.

There are 7 steps in agricultural practices.

A plough is a farming tool used for turning over soil in preparation for planting. It typically consists of several components, including a ploughshare, plough shaft, and beam. The ploughshare is the part of the plough that actually cuts into the soil, while the plough shaft is the long handle or pole that the farmer holds onto to control the plough. The beam is the horizontal bar that connects the ploughshare and plough shaft. However, a roller is not a part of the plough. A roller is a separate farming tool used for flattening and compacting soil after ploughing.

A plough is an agricultural implement used for tilling the soil, which involves turning over the upper layer of the soil to bring fresh nutrients to the surface, burying weeds, and preparing the field for sowing. A hoe is typically used for weeding and shaping soil, a sickle is used for cutting crops or grass, and a leveller is used for making the field level and even.

Kharif crops are sown at the beginning of the monsoon season, typically around June and July, and harvested at the end of the monsoon season, around September and October. These crops rely on the rainfall brought by the monsoon, which provides the necessary water for their growth.

Examples of Kharif crops include rice, maize, millet, sorghum, and pulses like pigeon pea and urad dal. The timing of sowing and harvesting may vary slightly depending on the regional climate and onset of the monsoon in different parts of the country.

Ploughing is a farming practice that involves turning over the soil to prepare it for planting. It has several benefits, such as aerating the soil, which allows for better root growth and nutrient absorption by plants. Ploughing also helps in mixing nutrients in the soil uniformly, ensuring that plants have access to essential elements. Additionally, it helps in removing unwanted plants from the fields, allowing crops to grow without competition for resources. However, ploughing does not kill soil organisms. In fact, it can disturb and temporarily disrupt their habitat, but it does not eliminate them entirely. Soil organisms play a crucial role in maintaining soil fertility and nutrient cycling, making them essential for healthy plant growth.

Zaid crops are grown in the summer season between the rabi and kharif seasons. These crops require warm, dry weather for growth and shorter maturity periods. Some examples of zaid crops are watermelon, muskmelon, cucumber, and bitter gourd.

Kharif crops are typically sown during the monsoon season (June-July) and harvested in September-October. Rabi crops are sown in winter (October-November) and harvested in April-May.

Wuhan is the correct answer because it is widely recognized as the epicentre of the COVID-19 outbreak. The city was the first to report cases of the virus and experienced a large number of infections in the early stages of the pandemic. The outbreak was traced back to a seafood market in Wuhan, where the virus is believed to have originated. The city implemented strict lockdown measures to control the spread of the virus, and it has since become synonymous with the global COVID-19 pandemic.

The "n" in nCOVID-19 stands for "novel." This term is used to describe the virus as a new and previously unknown strain of coronavirus that has not been identified before.

Rice is not considered a cash crop because it is primarily grown for subsistence purposes rather than for commercial sale. Cash crops are typically cultivated for profit and include crops like cotton, sugarcane, and tobacco. However, rice is a staple food crop in many countries and is grown to meet the dietary needs of the local population rather than for export or sale.

A cultivator is a farm implement that can perform both levelling and ploughing tasks. It is designed to break up and mix the soil, preparing it for planting crops. The cultivator has multiple tines or blades that can penetrate the soil and loosen it, removing weeds and improving the soil structure. It can also be used for levelling the ground by adjusting the depth and angle of the tines. Therefore, a cultivator is capable of performing both levelling and ploughing functions.