Soil Science - Study Mode
[#341] Match the following columns: Column I Column II a. Nitrate -N 1. Eutrophication b. Nitrous oxide 2. Methemo-globin emia c. Nitrogen and phosphorus 3. Ozone layer d. Cadmium as contaminant in zinc and phosphatic fertilizers 4. Heart and kidney disease
Correct Answer
(B) a-2, b-3, c-1, d-4
Explanation
Solution: Drinking water with high nitrate can cause a fatal disorder called Methemo-globinemia . Nitrous oxide is a greenhouse gas and it destroys the Ozone layer . An overabundance of nutrients like nitrogen and phosphorus in water leads to Eutrophication . Cadmium is a toxic heavy metal, present as a contaminant in zinc and phosphatic fertilizers are fatal to our Heart and kidney .
[#342] Efficient fertilisers use results in
Correct Answer
(A) More crop per kg fertiliser
Explanation
Solution: Efficient fertilizers are those which fulfill all the nutrient deficiencies of the plants and help them grow healthily. But the efficiency of fertilizer depends on the maximum yield of the crop with minimal use of fertilizer, i.e. more crop per kg fertilizer.
[#343] The relative proportion of sand, silt and clay in a soil is known
Correct Answer
(A) Soil texture
Explanation
Solution: The relative proportion of sand, silt and clay in the soil is known as Soil texture . Soil separates are specific ranges of particle sizes like the smallest particles are clay particles and the largest one is a sand particle. Soil texture is a classification instrument used in the field to determine soil classes based on their physical texture. It determines crop suitability and predicts the response of the soil to environment and management conditions.
[#344] What is the content of organic matter in alluvial soil?
Correct Answer
(B) 0.34 - 0.77
Explanation
Solution: Alluvial soil contains silt, sand, clay and gravel as well as humus, lime, and organic matter. It is referred to as loose sediments of all types deposited by running water. This soil is very fertile and rich in nutrients, many crops can be grown and gives a very good yield. The content of organic matter in alluvial soil is 0.34 to 0.77 approximately.
[#345] Good 'Indicator Plant' for N deficiency is
Correct Answer
(B) Maize
Explanation
Solution: Some of the crops are known to be specific for the occurrence of symptoms of a particular deficient nutrient element exhibiting characteristic symptoms. And such crops are called Indicator crops . Cereals like maize, sorghum and pulses are indicator crops for nitrogen elements.