Soil Science - Study Mode

[#851] 'Hartig Net' is seen after infection of which Mycorrhizae?
Correct Answer

(A) Ectomycorrhizae

Explanation

Solution: 'Hartig net' is seen after infection of Ectomycorrhizae. Hartig net is a network of inward-growing hyphae that extends into the root penetrating between the epidermis and cortex of ectomycorrhizal plants. This network is a site of nutrient exchange between the fungus and the host plant. The Hartig net is one of the three components required for ectomycorrhizal roots to form as part of ectomycorrhizal symbiosis with the host tree or plant.

[#852] Seeds of pulses are inoculated with bacteria to
Correct Answer

(A) Increase N supply

Explanation

Solution: Seeds of pulses are inoculated with bacteria to increase Nitrogen supply. Pulses belong to the legume family and nitrogen fixation is the main and distinguishing feature of the pulse family. Nitrogen fixation is the process whereby legume crops and specific rhizobium bacteria associate symbiotically to produce nitrogen from the soil air and make it available to be absorbed and used by the plant.

[#853] The occurrence of quartz in high amounts makes a rock
Correct Answer

(A) Acidic

Explanation

Solution: The occurrence of quartz in high amounts makes a rock Acidic . Rocks are referred to as acidic if they contain more than 20% of free quartz. It is based on the idea that high silica rocks are acidic whereas the rocks with low silica content are basic. Typical acidic rocks are granite or rhyolite.

[#854] Chemical formula of siderite is
Correct Answer

(D) FeCO 3

Explanation

Solution: Siderite is a mineral composed of Iron(II) carbonate, the chemical formula of siderite is FeCO 3 . It is valuable iron material, as it contains 48% iron and contains no Sulphur or phosphorus. It crystallizes in the trigonal crystal system and is rhombohedral in shape, typically with curved and striated faces.

[#855] Which science assumes the status of petrology, petrography and pedogenesis
Correct Answer

(C) Pedology

Explanation

Solution: Pedology is a discipline within soil science that focuses on understanding and characterizing soil formation, evolution, and the theoretical frameworks for modeling soil bodies in the context of the natural environment. It assumes the status of petrology, petrography and pedogenesis. Petrology is the study of rocks and the processes that form and transform them. Petrography is the process of petrology that focuses on detailed descriptions of rocks. Pedogenesis is the study of the origin and formation of soil.