Which one of the following crops enriches the Nitrogen content in soil?
Correct Answer:
(D) Pea
Legume crops enrich the soils with nitrogen content by atmospheric nitrogen fixation. Plants that contribute to nitrogen fixation include clover, soybeans, alfalfa, lupins, peanuts, and rooibos, etc. Thus, option (d) is correct.
Ques: 2
When you travel in certain parts of India, you will notice red soil. What is the main reason for this colour?
Correct Answer:
(C) Presence of ferric oxides
Most of the red soils have come into existence due to weathering of ancient crystalline and metamorphic rocks. The red soils are short of lime, magnesium, phosphates, nitrogen and humus, but are fairly rich in potash. In their chemical composition, they are mainly siliceous and aluminous. The reason for the red colour of the soil is the presence of ferric oxide.
Ques: 3
The micronutrient which is maximum deficient in Indian soils, is?
Correct Answer:
(D) Zinc
Zinc is the micronutrient that is maximum deficient in Indian soils in the given options.
Ques: 4
Given below are two statements, one is labelled as Assertion (A) and other as Reason (R).
Assertion (A): The Himalayan soils are rich in humus.
Reason (R): The Himalayas have the largest area under forest cover.
Code:
(A) and (R) are true, and (R) is the correct explanation of
(A).
Correct Answer:
(D) is false, but (R) is true.
The Himalayan soils lack humus while the Himalayas have the largest area under forest cover. Thus, Assertion (A) is false but Reason (R) is true.
Ques: 5
A fertile soil, suitable for growing common crops is likely to have a pH value of:
Correct Answer:
(C) Six to seven
The soil pH is a measure of the acidity or alkalinity in soils. A pH below 7 is acidic and above 7 is alkaline. Soil pH is considered a master variable in soils as it controls many chemical processes that take place. It specifically affects plant nutrient availability by controlling the chemical forms of the nutrient. Most nutrients that plants need can dissolve easily when the pH of the soil solution ranges from 6.0 to 7.0. Thus, option (c) is correct.
Ques: 6
Which one of the following can be used to make acidic soil cultivable?
Correct Answer:
(A) Lime
Generally, lime is used to make acidic soil cultivable. It is notable that excessive alkaline or acidic soil is not good for soil health and it is not used for cultivation of common crops.
Ques: 7
The solution to the problem of soil salinity and alkalinity is:
Correct Answer:
(B) Use of Gypsum in the fields
Gypsum is used to change the alkalinity of the soil and remove the salinity from it. It also requires one feet water for soil leaching.
Ques: 8
In India maximum alkali area is found in the State of—
Correct Answer:
(D) Uttar Pradesh
According to the Central Soil Salinity Research Institute, Karnal, most saline soil in India is found in Gujarat. Salt-affected soil is categorized as saline, Alkali and coastal saline soil. The distribution of these soils in the given states is as follows –
Notably, most alkaline soil is found in Uttar Pradesh. Thus, the correct answer will be option (d).
State
Saline
Alkaline
Coastal
Total
soil Area
soil Area
Saline
Saline
(Hec.)
(Hec.)
Soil Area
Soil area
(Hec.)
(Hec.)
Gujarat
1218255
541430
462315
2222000
U.P.
21989
1346971
0
1368960
Haryana
49157
183399
0
232556
Punjab
0
151717
0
151717
Ques: 9
In India, the largest area of Saline soil is found in the state of –
Correct Answer:
(C) Gujarat
According to the report of Central Soil Salinity Research Institute (CSSRI) Karnal, Haryana, the distributions of saline soil area in hectare the given States are as follows -
From the table, it is clear that largest area of Saline soil is found in Gujarat and Alkali soil in Uttar Pradesh.
State
Saline Soil
Alkali Soil
Coastal Soil
Total
Uttar Pradesh
21989
1346971
0000
1368960
Haryana
49157
183399
0000
232556
Gujarat
1218255
541430
462315
2222000
Maharashtra
177093
422670
6996
606759
Ques: 10
Salinization occurs when the irrigation water accumulated in the soil evaporates, leaving behind salts and minerals. What are the effects of salinization on the irrigated land?
Correct Answer:
(B) It makes some soils impermeable
Soil salinization is often a problem in arid regions where ions of soluble salt build up in the soil. In these regions, where irrigation is required for plants to grow, the processes of evaporation and transpiration leave the salt behind in the soil. Over several years, the amount of salt grows to the point that it hinders both seed germination and plant growth, reducing crop yields and eventually rendering soil unusable.
Ques: 11
Which of the following soil is most suited for tea plantation?
Correct Answer:
(A) Acidic
Tea is grown in a variety of soils. The best, however, is soil slightly acidic and without calcium as tea is highly intolerant to stagnant water. Although tea requires heavy rainfall for its growth, stagnant water is injurious to its roots. It is, therefore, grown on hill slopes where water drains away easily and water-logging does not take place. However, it grows equally well in the valley if the drainage system is good.