Soil Science MCQ Question and Answer | Agriculture MCQ Question

With increasing water content, the Thermal conductivity of soil Increases.
As per the studies, it is seen that soil thermal conductivity increases as a power function of soil moisture content. The thermal diffusivity first increases with increasing soil moisture, then decreases after reaching its maximum.

USDA soil taxonomy is developed by the United States Department of Agriculture and the National Cooperative Soil Survey provides an elaborate classification of soil types according to several parameters and in several levels: Order, Suborder, Great Group, Subgroup, Family and Series.
This classification was originally developed by Guy Donald Smith, hence also known as the father of Soil Taxonomy.

Fertilizer use is profitable if each rupee is spent on a fertilizer crop worth at least Rs. 2.
Using survey results, rough calculations suggest agricultural household's spend on fertilizer or manure would be in the range of Rs. 78,000 - Rs. 1,20,000 crore in a cropping year. Adding the fertilizer subsidy bill, this amount will be around 1.7% of India’s consumption expenditure.

The carbon dioxide percentage in the soil air is 0.25%.
The soil air contains several gases including nitrogen, oxygen, carbon dioxide and water vapour. Soil air constantly moves from the soil pores into the atmosphere and from the atmosphere into the pore space. Soil air and atmospheric air differ in compositions.

Vasily V. Dokuchaev is known as the father of Pedology. He is also known as the founder of modern soil science. He introduced the idea that the geographical variations in soil type could be explained by other variables besides geological factors. He also developed the first soil classification.
Pedology is defined as the science that studies the genesis, nature, distribution and use of the potentiality of soil resources.

The strength of DTPA extract used for micronutrient analysis is 0.005M.
DTPA (Diethylene triamine Penta acetate) micronutrient extraction method is a non-equilibrium extraction for estimating the potential soil availability of Zn, Cu, Mn and Fe. It has been used for cadmium, nickel and lead in soils.
The soils are extracted for available cationic micronutrients using the AB-DTPA method developed by Soltanpour and Workman in one set and by DTPA extracting solution (0.005 M DTPA, 0.1 M triethanolamine, 0.01 M Cacl₂).

The pipette method is a more accurate method of determination of soil texture.
The pipette method consists in using a pipette to take a specific volume of a water suspension of soil. If solid particles suspended in a liquid are allowed to settle freely, then by stroke's equation, after a selected time interval, t, all the particles larger than the diameter, d, will have fallen below a level designated as M.

Calcite is one of the non-silicate mineral.
Non-silicate minerals are minerals that are not composed of silicate groups. These minerals may contain oxygen atoms but not in combination with silicon. Nonsilicate minerals are less complex than silicate minerals.
Non-silicate minerals are organized into six major groups based on their chemical compositions these are carbonates, halides, native elements, oxides, sulphates and suphides.

Lichens are associated between Fungi and algae.
A lichen is a composite organism that arises from algae or cyanobacteria living among filaments of multiple fungi species in a mutualistic association. Lichens have properties different from those of their component organisms.
Lichens do not have roots that absorb water and nutrients as plants do. But like plants, they produce their nutrition by photosynthesis. when they grow on plants, they do not live like parasites, but instead, they just use the plant's surface as a substrate and in return give nutrients to plants.

Grass tetany is caused by the deficiency of Magnesium in forage crops.
Grass tetany is a metabolic disease involving magnesium deficiency, it occurs in such ruminant livestock as beef cattle, dairy cattle, and sheep. It occurs usually after grazing on pastures of rapidly growing grass, especially in early spring.
Low magnesium intake by grazing ruminants may occur especially with some grass species early in the growing season, due to seasonally low magnesium concentrations in forage dry matter.