Soil Science - Study Mode

[#946] Ionic potential is maximum in case of
Correct Answer

(D) Li

Explanation

Solution: The ionic potential is the ratio of the electrical charge (z) to the radius (r) of an ion. This ratio is a measure of the charge density at the surface of the ion, usually the denser the charge, the stronger the bond formed by the ion with ions of opposite charge. Out of the given options, Lithium has the highest ionic potential value. On moving down the group, the atomic number of alkali metals increases and their ionization potential value decreases.

[#947] Dry adiabatic lapse rate is
Correct Answer

(C) 9.8° C/Km

Explanation

Solution: The dry adiabatic lapse rate is the rate at which the temperature of a parcel of dry air decreases as the parcel is lifted in the atmosphere. No heat is added or subtracted from the moving air parcel (adiabatic) and no moisture is condensing.
The dry adiabatic lapse rate is 5.5°F per 1000 ft. or 9.8°C per km .

[#948] One baule unit is
Correct Answer

(A) 223 kg N, 45 kg P, 76 kg K

Explanation

Solution: Baule unit is defined as the amount of nutrient when added results in moving 'Y' (yield) halfway closer to A (maximum potential yield). One Baule unit will give 50% yield, the second Baule will give 50% of 50 i.e. 25% yield as such 2 baules will give 75% yield. One Baule unit is 223 kg N, 45 kg P, 76 kg K .

[#949] C/N of bacteria cell is
Correct Answer

(B) 5 : 1

Explanation

Solution: C : N ratio is a ratio of the mass of carbon to the mass of nitrogen in a substance. The carbon to nitrogen ratio is significant in composting because microorganisms need a good balance of carbon and nitrogen to remain active. High C/N ratios can lead to prolonged composting duration and low C/N ratios enhance nitrogen loss. C/N of a bacterial cell is 5 : 1, i.e. 5% of carbon with 1% nitrogen in each cell of bacteria.

[#950] Which of the following class of fungi are most frequent in soil?
Correct Answer

(D) Fungi Imperfecti

Explanation

Solution: Fungi imperfecti are the most frequent in soil. the fungi imperfecti or imperfect fungi are fungi that do not fit into the commonly established taxonomic classifications of fungi that are based on biological species concepts or morphological characteristics of sexual structures because their sexual form of reproduction has never been observed. Eg: Deuteromycetes are one of the imperfect fungi.