476: With reference to Indian agriculture, which one of the following statements is correct?
(a) About 90 per cent of the area under pulses in India is rainfed.
(b) The share of pulses in the gross cropped area at the national level has double in the last two decades
(c) India accounts for about 15 per cent of the total area under rice in the world
(d) Rice occupies about 34 per cent of the gross cropped area of India
477: Which of the following is/are the advantage /advantages of practising drip irrigation?
1. Reduction in weed
2. Reduction in soil salinity
3. Reduction in soil erosion
Select the correct answer using the code given below.
(a) 1 and 2 only
(b) 3 only
(c) 1 and 3 only
(d) None of the above is an advantage of practising drip irrigation
478: Which one of the following National Parks lies completely in the temperate alpine zone?
(a) Manas National Park
(b) Namdapha National Park
(c) Neora Valley National Park
(d) Valley of Flowers National Park
Explanation:
The Valley of Flowers national park located in the Chamoli district of Uttarakhand and is known for its meadows of endemic alpine flowers and the variety of flora.Situated approximately 3255m above sea level, this splendid park is spread across 87.5 sq km of land.
The valley has three sub-alpine between 3,200m and 3,500m which is the limit for trees, lower alpine between 3,500m and 3,700m, and higher alpine above 3,700m.
The rich diversity of species reflects the valley's location within a transition zone between the Zanskar and Great Himalayas ranges to the north and south, respectively, and between the Eastern Himalaya and Western Himalaya flora.
479: When you travel in Himalayas, you will see the following :
1. Deep gorges
2. U-turn river courses
3. Parallel mountain ranges
4. Steep gradients causing land-sliding
Which of the above can be said to be the evidences for Himalayas being young fold mountains?
(a) 1 and 2 only
(b) 1, 2 and 4 only
(c) 3 and 4 only
(d) 1, 2, 3 and 4
Explanation:
1. Deep gorges: River Sutlej cut across the Great Himalayan gorges which are 2000-4000 meters deep, while the width of these gorges between summits is 10-25 km.
2. U-turn river courses: River Brahamputra at Namcha Barwa
3. Parallel mountain ranges: Zaskar and Pir Panjal are parallel ranges
4. Steep gradients causing land-sliding: These are very common, every year in rainy season we use to hear this news.
So all are correct.
480: The following are the major oilseeds produced in India :
I. Sesamum
II. Mustard
III. Groundnut
IV. Soyabean
Which one of the following is the correct sequence of the descending order of the quantity of their production ?
(a) I, II, III, IV
(b) III, II, IV, I
(c) II, IV, III, I
(d) III, IV, II, I