Tag: evs - i

As a result of various activities of mankind, our environment is getting increasingly polluted. pollutants are of 2 types: Biodegradable and non-bio degradable

Saalumarada Thimmakka is an Indian environmentalist from the state of Karnataka, noted for her work in planting and tending to 384 banyan trees along a four-kilometre stretch of highway. Her work has been honoured with the National Citizen's Award of India.

Reforestation means replanting of forest trees in areas, which were once having dense forests but the forests were later on destroyed by cutting of trees in large numbers. Afforestation is different from reforestation. Afforestation is planting of trees in new areas, which were not previously under forest cover. Typically, waste lands or land other wise not previously having forest cover is selected. Indigenous species are more suited for this purpose because they are well adapted to local climatic and soil conditions. These species are already acclimatized to local conditions.

Agroforestry or agro-sylviculture is a land use management system in which trees or shrubs are grown around or among crops or pastureland.

• Soil pollution is defined as the presence of toxic chemicals (pollutants or contaminants) in soil, in high enough concentrations to pose a risk to human health and/or the ecosystem.
• Soil pollution causes digestive problems such as diarrhea, abdominal pain, etc. Soil pollution can also cause a neuromuscular blockage as well as depression of the central nervous system, headaches, nausea, fatigue, eye irritation, and skin rash.
  
• Hence Soil pollution can cause digestive problems is a true statement.
• So, the correct answer is 'True'.

• Soil pollution is defined as the presence of toxic chemicals (pollutants or contaminants) in soil, in high enough concentrations to pose a risk to human health and/or the ecosystem.
• The effects of soil pollution are:
• Sewage sludge is contaminated with pathogenic bacteria, viruses, and worms.
  
• Loss of fertility of soil.
• Results in Various diseases related to the digestive system.
• So, the correct answer is 'All the above'.

• Soil pollution is defined as the presence of toxic chemicals (pollutants or contaminants) in soil, in high enough concentrations to pose a risk to human health and/or the ecosystem.
• Due to the soil pollution the harmful chemicals present in the soil increase toxicity so soil fertility decreases and yield of soil is also decreased. Hence soil pollution affects the productivity of the soil.
• Hence Soil pollution does not affect the productivity of the soil is a wrong statement.
• So, the correct answer is 'Option B'.

Negative soil pollution occurs because of overuse of soil & its erosion thereby decreasing soil productivity. For example soil salinity due to over irrigation.

Terracing is the practice of creating nearly level areas in a hillside area. The terraces form a series of steps, each at a higher level than the previous. Terraces are protected from erosion of soil. 

Crop rotation is the practice of growing a series of different types of crops in the same area in sequential seasons. Crop rotation gives various nutrients to the soil. Growing the same crop in the same place for many years in a row disproportionately depletes the soil of certain nutrients. With rotation, a crop that leaches the soil of one kind of nutrient is followed during the next growing season by a dissimilar crop that returns, that nutrient to the soil or draws a different ratio of nutrients: for example, rice followed by cotton.