Soil Science MCQ Question and Answer | Agriculture MCQ Question

In sugarcane, the fourth fully developed leaf from the top is most appropriate for the total tissue test. The fully developed leaf will show the exact nutrient values in the plant and give more accurate values.
A tissue test through leaf analysis is done to assess the nutrient need of the plant.

Rendzina is a soil type recognized in the various soil classification system, these are humus-rich shallow soils that are usually formed from carbonate or sulphate-rich plant material. These soils are rich in calcium and magnesium, but potassium content is low.
Rendzina soils are usually poorly suited to agricultural use. And it comes under Calcimorphic.

Sandstone and dolomite rocks are Sedimentary rocks.
Sandstone is a classic sedimentary rock composed mainly sand sized silicate grains.
Dolomite is a sedimentary carbonate rock that contains a high percentage of the mineral dolomite. Dolomite is resistant to erosion.

X-rays are high-energy rays. The energy content of X-rays is quite more than infrared, gamma, and cosmic rays.
X-rays have a wavelength ranging from 10 picometers to 10 nanometers, frequencies in the range of 30 petahertz to 30 exahertz and energy in the range of 145 eV to 124 keV.

The peeling off the plates from parent rock due to differential expansion and contraction of minerals as a result of temperature changes is called Exfoliation. It is a process in which large flat or curved sheets of rock fracture and are detached from the outcrop due to pressure release. It mostly occurs when the temperature of rocks changes rapidly that can expand or crack the rocks.

The activated sludge is a type of biological wastewater treatment process for treating sewage or industrial wastewater using aeration and a biological floc composed of a mixed blend of microorganisms, 95% of which are a variety of mostly aerobic species of bacteria, and also contains fungi, protozoa and higher forms of invertebrates along with some essential nutrient elements. The nutrient elements it contains are 3 - 6% N, 2% P₂O₅ and 1.0% K₂O.

Zn-EDTA contains 12% of Zinc. It contains zinc chelated with EDTA (Ethylene Diamine Tetra Acetic Acid). It is used as a fertilizer to overcome zinc deficiency in plants, as well as a source of zinc for those plants which require Zinc for their normal growth and higher yields.

Hydrogen bonding takes place in the interlayer of Kaolinite.
Kaolinite is a clay mineral, with the chemical composition Al₂Si₂O₅(OH)₄. It is a layered silicate mineral, with one tetrahedral sheet of silica linked through oxygen atoms to one octahedral sheet of alumina octahedral.

Nitrogen is a nutrient element that is absorbed in both positive and negative forms.
It is absorbed in the form of ammonium ion i.e. NH₄⁺ is a positive ion. Also, it is absorbed as nitrate ion i,e. NO₃^-, that is a negative ion.

Denitrification is the microbial process of reducing nitrate and nitrite to gaseous forms of nitrogen. The preferred nitrogen electron acceptors in order of most to least thermodynamically favourable include nitrate, nitrite, nitric oxide and nitrous oxide finally resulting in the production of nitrogen gas completing the nitrogen cycle.
The end product of the denitrification process is N₂O and ultimately nitrogen gas, which is released back into the atmosphere.