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Free download in PDF Soil Science Objective Type Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(21)
Denitrification mostly takes place in _____
[A]
Aerobic
[B]
Anaerobic
[C]
Both
[D]
None of the above
(22)
Nitrification process ceases at pH
[A]
< 5
[B]
< 6
[C]
< 4
[D]
< 7
(23)
Which nutrient influence the nodule formation and nitrogen fixation in soil?
[A]
pH
[B]
N
[C]
P
[D]
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
(26)
Aroma of earthy smell in first shower of monsoon is due to _____
[A]
Actinomycetes
[B]
Bacteria
[C]
Fungi
[D]
None of the above
(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
(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
31
Organism utilize carbon from CO2 for their cellular synthesis
[A]
Hetrotrophs
[B]
Chemotrophs
[C]
Autotrophs
[D]
None of the above
32
Which organism derive their energy from oxidation of complex organic compound
[A]
Heterotrophs
[B]
Autotrophs
[C]
Chemotrophs
[D]
Lithotrophs
33
Optimum temperature for mesophile
[A]
10-20°C
[B]
20-40°C
[C]
40-60°C
[D]
15-20°C
34
Thermophiles organism lies in temperature
[A]
> 45°C
[B]
> 25°C
[C]
< 45°C
[D]
< 25°C
35
The microorganism lies below < 10°C is called _______
[A]
Psychrophiles
[B]
Mesophiles
[C]
Thermophiles
[D]
Thermophiles
36
The K2O content in Illite varied between
[A]
6 to 10%
[B]
2 to 4%
[C]
10 to 15%
[D]
33%
37
Quantity of soil to be taken for texture analysis
[A]
10g
[B]
20g
[C]
30g
[D]
40g
38
N content in thiourea is _________
[A]
46%
[B]
36.8%
[C]
22.5%
[D]
None of the above
39
Chemical formula of thiourea is _____
[A]
CO(NH2)2
[B]
SC(NH2)2
[C]
HCN
[D]
None of the above
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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