Question 671 Humus colloids are composed basically of? A) Carbon B) Nitrogen C) Helium D) Ozone No Details
Question 673 How many orders are included in the 7th Approximation system of soil classification? A) 8 B) 15 C) 10 D) 12 No Details
Question 674 Horizontal layers in the soil profile are known as? A) Soil columns B) Horizontal zones C) Soil horizons D) Rhizospheres No Details
Question 675 Hilly soils are low in lime and ? A) Alkaline B) Acidic C) Saline D) None of these No Details
Question 676 Highly available form of phosphorus at pH 7.5 is? A) H2PO4 B) PO3 C) HPO4 D) Insoitol No Details
Question 677 Heterotrophic organisms obtain energy from the biological oxidation of? A) Organic carbon B) NH4 C) SO4-2 D) CO2 No Details
Question 678 Gypsum an amendment applied to alkali soil belongs to ______ type? A) Acid former B) Low solubility C) Soluble Ca-salt D) None of these No Details
Question 679 Gypsum requirement of the soil can be determined by 344-N( A-B ) in which N is equal to? A) Normality at EDTP B) Morality of EDTA C) Amount of EDTP D) None at the above No Details
Question 680 Group of legume plant that develops nodules when exposed to bacteria nodules obtained from the nodules of any member of that plant group is known as? A) Symbiotic promiscuity B) Cross inoculation group C) Symbiosis D) None of the above No Details