Soil Science - Study Mode

[#936] Fertilisers contain one or more
Correct Answer

(B) Plant nutrients

Explanation

Solution: A fertilizer is any material of natural or synthetic origin that is applied to soil or to plant tissues to supply plant nutrients. Fertilizers can be either natural or industrially produced. Fertilizers enhance the growth of the plants and the effectiveness of the soil by modifying its water retention and aeration. Fertilizers contain one or more plant nutrients.

[#937] Which epipedon is not common in India?
Correct Answer

(D) Folistic

Explanation

Solution: Epipedons are a horizon that has developed at the soil surface. It is a horizon in which rock structure has been destroyed and which has either been darkened by organic matter or eluviated. There are eight important epipedons anthropic, folistic, histic, melanic, mollic, orchric, plaggen and umbric epipedons. However, Folistic epipedon is not common in India.

[#938] Critical concentration (ppm) of Zn in case of DTPA extract is
Correct Answer

(A) 6

Explanation

Solution: The DTPA (Diethylene triamine pentaacetic acid) micronutrient extraction method is a non-equilibrium extraction for estimating the potential soil availability of Zinc, Copper, Manganese and Iron. The critical concentration (ppm) of Zinc in the case of DTPA extract is 6.

[#939] Urea has chemical composition
Correct Answer

(A) Co(NH 2 ) 2

Explanation

Solution: Urea is an organic compound with the chemical formula CO(NH 2 ) 2 . This amide has two NH 2 groups joined by a carbonyl (C = O) functional group. Urea serves an important role in the metabolism of nitrogen-containing compounds by animals and is the main nitrogen-containing substance in the urine of mammals.

[#940] Which of the following nutrient elements is responsible for the dieback of citrus?
Correct Answer

(B) Cu

Explanation

Solution: The decline in the yield of citrus fruits is commonly known as ‘dieback’ or chlorosis. It is a syndrome expressing many disorders in the plant that leads to a decline in productivity, reduced productive life and poor fruit quality. The deficiency of copper in the soil is responsible for the cause of the 'dieback’ of citrus fruits. It leads to poor growth, delayed flowering and plant sterility in citrus.