Agronomy - Study Mode

[#631] Rancidity in sunflower oil is caused by
Correct Answer

(B) Oxidation

Explanation

Solution: Rancidity is one of the conditions of the oxidation process, aerial oxidation of unsaturated fatty acids present in fats and oils, which causes a change in colour, smell and taste of any such substance. In sunflower oil, because of lipid oxidation, the quality of food decreases, as fats and oils react with molecular oxygen present in the atmosphere resulting in rancidity.

[#632] The nitrogen losses in rice can be reduced by placing NH 4 fertilizer in
Correct Answer

(B) Reduced one

Explanation

Solution: Nitrogen losses in any field occur mainly because of ammonia volatilization, denitrification, leaching, agricultural runoff, etc. And as in rice cultivation plantation is submerged type, ammonia based fertilizers are not recommended in flooded rice systems due to potential N loss through denitrification in the anaerobic plough layer.

[#633] The highest production in terms of million tones per year in India is that of
Correct Answer

(C) Sugarcane

Explanation

Solution: India is the largest producer of milk, jute and pulses and ranks second in the production of rice, wheat, sugarcane, cotton, etc. But the highest production in terms of million tons per year is sugarcane. India produces approximately 167 metric tons of sugarcane. Uttar Pradesh is the highest sugarcane producing state, it produces 135.64 million tons of cane.

[#634] The minamata incident, an example for environmental degradation, is due to which one of the following?
Correct Answer

(C) Water pollution

Explanation

Solution: The Minamata disease is caused by the element mercury in the form of methyl mercury present in the industrial waste which is dumped into water bodies and causes water pollution. This disease was first discovered in 1956 in Japan. It is a lethal disease that can lead to paralysis and death.

[#635] Silvery shoot or onion leaf symptom of rice tillers is caused by
Correct Answer

(B) Gall midge

Explanation

Solution: Gall midge is a pest that attacks Rice plantations and infects the leaves of the paddy crop. It causes a tubular gall at the base of the tillers causing elongation of the leaf sheaths which resemble onion leaves that is why also called onion leaf or silvery shoot disease. It mainly attacks the rice in tillering stage and submerged the plantation.