Soil Science Quiz | Soil Science Objective Type Questions and Answers

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Questions
21 Denitrification mostly takes place in _____
A Aerobic
B Anaerobic
C Both
D None of the above

Answer: Anaerobic
22 Nitrification process ceases at pH
A < 5
B < 6
C < 4
D < 7

Answer: < 5
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23 Which nutrient influence the nodule formation and nitrogen fixation in soil?
A pH
B N
C P
D All of the above

Answer: All of the above
24 Rhizobium is an _____ organism
A Hetrotrophs anaerobic
B Heterotrophs aerobic
C Autotrophs anaerobic
D Autotrophs aerobic

Answer: Heterotrophs aerobic
25 Which genera of bacteria found maximum in soil?
A Azotobacter
B Pseudomonas
C Bacillus
D All of the above

Answer: Bacillus
26 Aroma of earthy smell in first shower of monsoon is due to _____
A Actinomycetes
B Bacteria
C Fungi
D None of the above

Answer: Actinomycetes
27 Actinomycetes prefer which condition for their growth
A Slightly alkaline
B Alkali
C Acidic
D Neutral

Answer: Slightly alkaline
28 Fungi growth optimum in pH
A 2.5-4.5
B 4.5-6.5
C 6.5-7.5
D 7.5-8.5

Answer: 4.5-6.5
29 Optimum growth of bacteria in soil
A Acidic
B Alkali
C Neutral to slightly alkaline
D Slightly acidic to neutral

Answer: Neutral to slightly alkaline
30 Most of the soil organism is _____
A Psychrophiles
B Mesophiles
C Thermophiles
D All of the above

Answer: Mesophiles
31 Organism utilize carbon from CO2 for their cellular synthesis
A Hetrotrophs
B Chemotrophs
C Autotrophs
D None of the above

Answer: Autotrophs
32 Which organism derive their energy from oxidation of complex organic compound
A Heterotrophs
B Autotrophs
C Chemotrophs
D Lithotrophs

Answer: Heterotrophs
33 Optimum temperature for mesophile
A 10-20°C
B 20-40°C
C 40-60°C
D 15-20°C

Answer: 20-40°C
34 Thermophiles organism lies in temperature
A > 45°C
B > 25°C
C < 45°C
D < 25°C

Answer: > 45°C
35 The microorganism lies below < 10°C is called _______
A Psychrophiles
B Mesophiles
C Thermophiles
D Thermophiles

Answer: Psychrophiles
36 The K2O content in Illite varied between
A 6 to 10%
B 2 to 4%
C 10 to 15%
D 33%

Answer: 6 to 10%
37 Quantity of soil to be taken for texture analysis
A 10g
B 20g
C 30g
D 40g

Answer: 20g
38 N content in thiourea is _________
A 46%
B 36.8%
C 22.5%
D None of the above

Answer: 36.8%
39 Chemical formula of thiourea is _____
A CO(NH2)2
B SC(NH2)2
C HCN
D None of the above

Answer: SC(NH2)2
40 Thiourea is type of fertilizer
A Slow release
B Nitrification inhibitors
C Natural nitrification inhibitors
D Artificial nitrification inhibitors

Answer: Artificial nitrification inhibitors

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