Soil Science - Study Mode

[#671] Layer spacing of Halloysite
Correct Answer

(B) 10.25

Explanation

Solution: Halloysite is an aluminosilicate clay mineral with its main constituents as Oxygen, Silicon, and hydrogen. It typically forms by hydrothermal alteration of alumino-silicate minerals. Halloysite was first described in 1826 and named after the Belgian geologist Omalius d’Halloy. Layer spacing of Halloysite is 10.25.

[#672] Important criteria for classifying soil at the family & sub order levels is
Correct Answer

(A) Soil temperature regime

Explanation

Solution: Important criteria for classifying soil at the family and suborder levels is the Soil temperature regime. Soil taxonomy is a hierarchical soil classification system with six categories or levels, theses are order, suborder, great group, subgroup, family and series. Soil taxonomy is a morphogenetic soil classification system using diagnostic horizons and features to infer pathways of soil genesis and formation.

[#673] Ballast elements are
Correct Answer

(A) Al & Si

Explanation

Solution: Ballast elements are those elements that refuse to attribute any useful metabolic function to these elements as they are available in large amounts in plant tissues and the plants can be grown perfectly normally without them. Aluminium (Al) and Silicon (Si) are such elements that are present in abundance in plants and their absence may not harm the growth of the plants thus called Ballast elements.

[#674] Unsaturated hydraulic conductivity is maximum in
Correct Answer

(D) Clayey soil

Explanation

Solution: Unsaturated hydraulic conductivity refers to a measure of soil water-retaining ability when soil pore space is not saturated with water. And it is maximum in Clayey soil . In unsaturated soil, some of the pores become air-filled and the conductivity decreases.

[#675] Volcanic soils are found in
Correct Answer

(B) Andisol

Explanation

Solution: Volcanic soils also known as Andisols , are formed from volcanic ash and cinder deposits. Andisols are soils formed in volcanic ash and defined as soils containing high proportions of glass and amorphous colloidal materials, including allophane, imogolite and ferrihydrite. They are generally quite young and typically very fertile.