716: The scientific view is that the increase in global temperature should not exceed 2°C above pre-industrial level. If the global temperature increases beyond 3°C above the pre-industrial level, what can be its possible impact/impacts on the world?
1. Terrestrial biosphere tends toward a net carbon source
2. Widespread coral mortality will occur
3. All the global wetlands will permanently disappear.
4. Cultivation of cereals will not be possible anywhere in the world
Select the correct answer using the code given below:
(a) 1 only
(b) 1 and 2 only
(c) 2, 3 and 4 only
(d) 1, 2, 3 and 4
717: With reference to soil conservation, consider the following practices :
1. Crop rotation
2. Sand fences
3. Terracing
4. Wind breaks
Which of the above are considered appropriate methods for soil conservation in India ?
(a) 1, 2 and 3 only
(b) 2 and 4 only
(c) 1, 3 and 4 only
(d) 1, 2, 3 and 4
Explanation:
Soil conservation is a set of management strategies for prevention of soil being eroded from the earth's surface or becoming chemically altered by overuse, acidification, salinization or other chemical soil contamination.
Decisions regarding appropriate crop rotation, cover crops, and planted windbreaks are central to the ability of surface soils to retain their integrity, both with respect toerosive forces and chemical change from nutrient depletion. Crop rotation is simply the conventional alternation of crops on a given field, so that nutrient depletion is avoided from repetitive chemical uptake/deposition of single crop growth.
Windbreaks are created by planting sufficiently dense rows or stands of trees at the windward exposure of an agricultural fields subject to wind erosion.
718: Which one of the following National Parks has a climate that varies from tropical to subtropical, temperate and arctic?
(a) Khangchendzonga National Park
(b) Nandadevi National Park
(c) Neora Valley National Park
(d) Namdapha National Park
Explanation:
Namdapha National Park is National Parks which has a climate that varies from tropical to subtropical, temperate and arctic. It is located in Arunachal Pradesh covering area of 1985.25 Sq.Km.
It is also the third largest national park after Hemis National Park-4400 Sq.Km.(J & K), Desert National Park-3162 Sq. Km.(Rajasthan)
719: Southeast Asia has captivated the attention of global community over space and time as a geostrategically significant region. Which among the following is the most convincing explanation for this global perspective ?
(a) It was the hot theatre during the Second World War
(b) Its location between the Asian powers of China and India
(c) It was the arena of superpower confrontation during the Cold War period
(d) Its location between the Pacific and Indian oceans and its pre-eminent maritime character
Explanation:
According to UNDP Report, the Southeast Asian countries which have the maritime character has shaped the societies and economies of the majority of these countries. Therefore, its location and maritime time opportunities has attracted the world and thus the option 'D' is correct.
720: Consider the following countries:
1. Albaina
2. Bosnia Herzegovina
3. Croatia
4. Macedonia
Which of these countries has/have Adriatic Sea as a boundary?
(a) 1 and 2
(b) 1, 2 and 3
(c) 4 only
(d) 3 and 4