This set of Environmental Biotechnology Multiple Choice Questions & Answers (MCQs) focuses on “Management of Alkali Soil”.
1. Over-limimg acidic soil leads to the alkalinity of the soil.
a) True
b) False
View Answer
Explanation: Soil turns alkaline over a range of time due to Over-limimg acidic soil and hence, there is a pH rise leading to alkaline soils.
2. Which of the following product is not used to reduce the soil alkalinity?
a) Sphagnum peat
b) Elemental sulfur
c) Organic mulches
d) Baking powder
View Answer
Explanation: Sphagnum peat, Elemental sulfur, Organic mulches contains acidic components which tends to decrease the soil pH whereas, Baking powder tends to increase the pH, hence, making it more alkaline.
3. Irrigation water which turns alkaline does not affect the soil pH.
a) True
b) False
View Answer
Explanation: Alkaline irrigation water leads the rise in pH of the soil, hence leading to the alkalinity of the soil.
4. In dry regions, the primary cause of soil alkalinity is due to calcium carbonate-rich parent material weathering.
a) True
b) False
View Answer
Explanation: Soils become alkaline and hence, there is a drop in pH and the primary cause of soil alkalinity in arid and dry regions is due to calcium carbonate-rich parent material weathering.
5. Which of the following methods can be used to reduce the soil alkalinity?
a) Increase the acid content
b) Anthropogenic contamination
c) Increasing dissolved oxygen
d) Mobilization of brines
View Answer
Explanation: By making the soil more acidic, it is possible to reduce the soil alkalinity, Anthropogenic contamination, water-rock interaction and Mobilization of brines, whereas, increasing the dissolved oxygen does not help to reduce the pH.
6. What does compost do to the alkaline soil?
a) Wash away salts and chemicals
b) Increase the pH
c) Leads to the death of microorganisms
d) Leads to soil contamination
View Answer
Explanation: Compost when added to the alkaline soil, it washes away the salts and chemicals in the soil leading to the drop in soil pH, increasing pH of soil will make the soil alkaline, and it does not kill the microorganisms and hence, no soil contamination.
7. Planting coffee plants near the soil would make the soil more alkaline.
a) True
b) False
View Answer
Explanation: Coffee plants decreases the pH of the soil and planting them near the alkaline soil would make the soil more acidic and not alkaline.
8. In alkaline soils, the salinity is reduced.
a) True
b) False
View Answer
Explanation: In alkaline soils, the soils are of higher pH and also, the salinity is less, because in principle, the alkaline soils are not saline.
9. What would be the effect on plants if the soil’s pH increases?
a) Nutrient absorption is reduced
b) Nutrient absorption increases
c) Soil contamination
d) Soil fertility increases
View Answer
Explanation: There is disruption of nutrient absorption by the plants if it’s pH increases, and hence, soil fertility is reduced, alkaline soil’s pH doesn’t lead to increase in nutrient absorption, soil contamination doesn’t happen.
10. Which of the following plants can grow in a pH range of 5-5.5?
a) Rhododendrons
b) Cactus
c) Tagetes
d) China rose
View Answer
Explanation: Rhododendrons can successfully thrive in the acid pH and grow in the range of 5-5.5, whereas Tagetes and China rose garden plants grow at 6.5 pH, cactus grow in alkaline conditions.
11. Which of the following vegetable doesn’t grow in alkaline soils?
a) Arugula
b) Asparagus
c) Beet
d) Pumpkins
View Answer
Explanation: Arugula, Asparagus, Beet grows best in alkaline soil in pH range of 6-7 whereas, Pumpkins grow well on mild acidic soils.
12. Reclamation of alkaline soils can be done by adding aluminium sulfate.
a) True
b) False
View Answer
Explanation: Reclamation of alkaline soils can be done by adding acidic reagents like aluminium sulfate which leads to drop in pH leading to decrease in soil alkalinity.
Sanfoundry Global Education & Learning Series – Environmental Biotechnology.
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