Soil Science 4
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Question No. 1
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Which soil order is characterized by young, embryonic soils with few diagnostic features?
A.
Inceptisols
B.
Entisols
C.
Vertisols
D.
Oxisols
Question No. 2
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Which soil order consists of recently formed alluvial soils with little profile development?
A.
Inceptisols
B.
Entisols
C.
Vertisols
D.
Oxisols
Question No. 3
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Which soil order is known for dark or black swelling clays that develop deep cracks when dry?
A.
Inceptisols
B.
Entisols
C.
Vertisols
D.
Oxisols
Question No. 4
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Which soil order is rich in oxides and sesquioxides and is highly weathered, typically found in tropical regions?
A.
Inceptisols
B.
Entisols
C.
Vertisols
D.
Oxisols
Question No. 5
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Which soil order is relatively young, acidic, and more prevalent in forest soils?
A.
Alfisols
B.
Histosols
C.
Aridosols
D.
Spodosols
Question No. 6
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Which soil is called organic soil and has more than 20% organic matter?
A.
Alfisols
B.
Histosols
C.
Aridosols
D.
Spodosols
Question No. 7
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Which soil order is found in desert regions and characterized by arid conditions?
A.
Alfisols
B.
Histosols
C.
Aridosols
D.
Spodosols
Question No. 8
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Which soil order accumulates sesquioxides and humus in the subsoil?
A.
Spodosols
B.
Ultisols
C.
Mollisols
D.
Andisols
Question No. 9
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Which soil order has low nutrient and base status and is typically found in forests?
A.
Spodosols
B.
Ultisols
C.
Mollisols
D.
Andisols
Question No. 10
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Which soil order is soft, dark grassland soil found in steppes and prairies, with high base status?
A.
Spodosols
B.
Ultisols
C.
Mollisols
D.
Andisols
Question No. 11
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Which of the following is NOT a major soil group described in the text?
A.
Alluvial soils
B.
Black soils
C.
Red soils
D.
Endisols
Question No. 12
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What are alluvial soils mainly formed from?
A.
Vertisols
B.
Entisols
C.
Ultisols
D.
Oxisols
Question No. 13
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Which soil group occupies the largest area in India?
A.
Alluvial soils
B.
Black soils
C.
Red soils
D.
Laterite soils
Question No. 14
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What are the two types of geographically classified alluvial soils?
A.
Khaddar and Bhangar
B.
Regur and Laterite
C.
Mollisols and Alfisols
D.
Oxisols and Ultisols
Question No. 15
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Which clay mineral is abundant in black soils?
A.
Kaolinite
B.
Montmorillonite
C.
Illite
D.
Vermiculite
Question No. 16
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What is the local name given to black soils derived from the Deccan trap in Maharashtra?
A.
Regur
B.
Laterite
C.
Khaddar
D.
Bhangar
Question No. 17
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Which soil group is the second largest in India after alluvial soils?
A.
Black soils
B.
Red soils
C.
Laterite soils
D.
Desert soils
Question No. 18
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Which nutrient is generally poor in black soils?
A.
Nitrogen, Phosphorus, and Organic Matter
B.
Potassium
C.
Calcium
D.
Magnesium
Question No. 19
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Which soil order is primarily associated with red soils?
A.
Alfisols
B.
Vertisols
C.
Ultisols
D.
Oxisols
Question No. 20
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What gives red soils their characteristic color?
A.
Iron
B.
Aluminum
C.
Manganese
D.
Titanium
Question No. 21
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Which soil group is known for its high phosphorus fixation capacity?
A.
Red soils
B.
Black soils
C.
Alluvial soils
D.
Laterite soils
Question No. 22
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Which soil group is also known as 'early soils' due to their suitability for early sowing?
A.
Red soils
B.
Black soils
C.
Alluvial soils
D.
Laterite soils
Question No. 23
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Which soil groups are laterite soils primarily formed from?
A.
Ultisols and Oxisols
B.
Entisols and Inceptisols
C.
Mollisols and Alfisols
D.
Vertisols and Aridosols
Question No. 24
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Which clay mineral is dominant in laterite soils?
A.
Kaolinite
B.
Montmorillonite
C.
Illite
D.
Vermiculite
Question No. 25
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Under what climatic conditions are laterite soils formed?
A.
Heavy rainfall and high temperature
B.
Arid conditions
C.
Cold and dry
D.
Temperate climate
Question No. 26
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Which agricultural practice is commonly adopted in areas with laterite soils?
A.
Shifting cultivation
B.
Intensive agriculture
C.
Dryland farming
D.
Organic farming
Question No. 27
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Which crops are well-suited for cultivation in laterite soils?
A.
Plantation crops and rice
B.
Wheat and barley
C.
Pulses and oilseeds
D.
Vegetables
Question No. 28
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What is soil fertility?
A.
The capacity of the soil to produce high yields
B.
The inherent capacity of the soil to supply plant nutrients
C.
The physical structure of the soil
D.
The biological activity in the soil
Question No. 29
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What is soil productivity?
A.
The capacity of the soil to produce a specified crop yield
B.
The total amount of nutrients in the soil
C.
The rate of nutrient uptake by plants
D.
The water-holding capacity of the soil
Question No. 30
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Which statement is true regarding soil fertility and productivity?
A.
A fertile soil is always productive.
B.
A productive soil is always fertile.
C.
Fertility and productivity are the same.
D.
A productive soil may not be fertile.
Question No. 31
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What is humus?
A.
A type of clay mineral
B.
A complex mixture of decomposed organic matter
C.
A type of fertilizer
D.
A soil amendment
Question No. 32
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What is the approximate C:N ratio of humus?
A.
10:1
B.
20:1
C.
30:1
D.
4:1
Question No. 33
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Which of the following is a component of humus?
A.
Lignin and Protein
B.
Cellulose and Starch
C.
Silica and Alumina
D.
Calcium and Magnesium
Question No. 34
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What is the approximate C:N ratio of normal soils?
A.
12:1
B.
10:1
C.
20:1
D.
30:1
Question No. 35
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What is the approximate C:N ratio of legumes?
A.
20:1 to 30:1
B.
10:1
C.
12:1
D.
4:1 to 9:1
Question No. 36
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What is the approximate C:N ratio of Farm Yard Manure (FYM)?
A.
20-30:1
B.
10:1
C.
12:1
D.
4:1 to 9:1
Question No. 37
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What is the approximate C:N ratio of microorganisms?
A.
4:1 to 9:1
B.
10:1
C.
12:1
D.
20-30:1
Question No. 38
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What is the approximate percentage of nitrogen in humus and organic matter?
A.
5 to 5.5%
B.
10 to 12%
C.
20 to 25%
D.
40 to 45%
Question No. 39
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Which soil order is characterized by dark or black swelling clays, and deep cracks develop when dry?
A.
Oxisols
B.
Vertisols
C.
Entisols
D.
Alfisols
Question No. 40
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What is the primary difference between soil fertility and soil productivity?
A.
Soil fertility refers to the inherent ability of the soil to provide essential nutrients.
B.
Soil productivity indicates how much crop yield can be obtained from the soil.
C.
Soil fertility and productivity are synonymous.
D.
Soil fertility is influenced only by biological factors.
Question No. 41
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Which soil order is characterized by oxide and sesquioxide-rich soils, typically found in tropical regions?
A.
Histosols
B.
Vertisols
C.
Oxisols
D.
Aridosols
Question No. 42
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Humus in the soil contains a high amount of which substance?
A.
Calcium
B.
Lignin
C.
Phosphorus
D.
Potassium
Question No. 43
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What is the term for the process where colloidal particles coagulate due to the addition of oppositely charged ions?
A.
Leaching
B.
Flocculation
C.
Ion exchange
D.
Buffering
Question No. 44
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In which soil type does the C:N ratio of humus typically range from 10:1?
A.
Alfisols
B.
Histosols
C.
Aridosols
D.
Alluvial soils
Question No. 45
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What is the primary cause of soil acidity?
A.
Presence of H+ and Al+3 ions in the soil solution or adsorbed on the soil colloids.
B.
Excess nitrogen in the soil.
C.
High organic matter content.
D.
Presence of potassium ions in the soil.
Question No. 46
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Which of the following is true about black soils formed from vertisols?
A.
They are rich in montmorillonite clay minerals.
B.
They are typically formed in desert regions.
C.
They have high phosphorus content.
D.
They are generally rich in organic matter.
Question No. 47
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Which soil group is most commonly found in Maharashtra and Madhya Pradesh?
A.
Alluvial soils
B.
Red soils
C.
Laterite soils
D.
Black soils
Question No. 48
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Which of the following statements is true about organic matter in soil?
A.
Organic matter tends to decline over time in soil.
B.
Organic matter is highest in forest soils compared to grasslands.
C.
Organic matter only includes the humus component.
D.
Organic matter is not crucial for maintaining soil health.
Question No. 49
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Which soil type is characterized by being high in phosphorus fixation capacity due to kaolinite clay?
A.
Red soils
B.
Black soils
C.
Alfisols
D.
Vertisols
Question No. 50
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Which of the following is true about the C:N ratio of legumes?
A.
It is equal to the C:N ratio of micro-organisms.
B.
It is higher than the C:N ratio of organic matter.
C.
It ranges from 20:1 to 30:1.
D.
It is lower than the C:N ratio of humus.
Question No. 51
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What type of soil is most commonly found in the southern regions of India, especially Tamil Nadu?
A.
Red soils
B.
Alluvial soils
C.
Aridosols
D.
Black soils
Question No. 52
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What role does soil buffering play in soil health?
A.
It increases soil acidity.
B.
It enhances the rate of water absorption in the soil.
C.
It regulates the availability of nutrients to plants.
D.
It helps with soil erosion control.
Question No. 53
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Which type of soil is suitable for plantation crops and rice cultivation, particularly in hilly areas of India?
A.
Black soils
B.
Alluvial soils
C.
Red soils
D.
Laterite soils
Question No. 54
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Which of the following is true about soil pH and nutrient availability?
A.
Nutrient availability increases as soil pH increases for certain nutrients.
B.
Soil pH does not affect nutrient availability.
C.
High pH always increases nutrient availability for all nutrients.
D.
Nutrients like phosphorous are more available at low pH.
Question No. 55
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What is the primary characteristic of soil classified under the Spodosols order?
A.
Found predominantly in desert regions.
B.
Low nutrient, low base status, and forest soils.
C.
High in montmorillonite clay.
D.
Rich in iron and manganese.
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