Tag: rules are for everyone

Acid rain is the secondary effect of air pollution. The gases like sulphur dioxide and nitrogen oxide when in high concentration in the air, mix with the air moisture in clouds and form sulphuric and nitric acids. These acids come down to the earth in the form of acid rain-causing much damage to the living organism and buildings. Acid rain pollutes water and soil both. When the rain droplets get mixed with nitrogen and sulfur oxide it causes acid rain. this acid rain when fall on earth reacts with soil because of chemicals present in acid rain, the fertility of particular area gets affected.

• Paint is any pigmented liquid, liquefiable, or mastic composition that, after application to a substrate in a thin layer, converts to a solid film. It is most commonly used to protect, colour, or provide texture to objects.
• 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.
  
• Paints consist of heavy metal pollutants which when mixed with soil causes soil pollution.
• Hence Paint is the industrial sources of soil pollution.
• So, the correct answer is 'Paints'.

• 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.
• Sources of soil pollution include Pesticides, Biomedical Wastes, Industrial Wastes, improper disposal of waste, etc.
• So, the correct answer is 'None of the above'.

Soil pollution is alteration in soil caused by removal or addition of substances and factors, which decrease its productivity and quality of plants and ground water. Negative soil pollution is reduction in soil productivity due to erosion and over use. Positive soil pollution is reduction in soil productivity due to addition of undesirable substances e.g., agrochemicals, industrial wastes, air pollutants washed down by rain, faulty sanitation etc. Pesticides and fertilisers are the two most important types of agrochemicals.

Tundra receives very little precipitation, around 25 cm year, mostly in the form of snow. The area is covered by snow for most part of the year. The highest summer temperature is $12^0$

Plants require water for the metabolic actions which is absorbed by the roots of the plants. The total water which is poured in the soil is not available to the plants.bThe total water content present in the soil is called hollard. Chresard is 75% of capillary water, water actually available for plants so that they can absorbed for their growth. Echard is remaining water. Therefore, correct relationship between them is Chresard + Echard = Hollard or Chresard = Hollard - echard. Thus, the correct answer is option B.