471: Which one of the following statements is correct with reference to our solar system ?
(a) The Earth is the densest of all the planets in our solar system
(b) The predominant element in the composition of Earth is silicon
(c) The Sun contains 75 per cent of the mass of the solar system
(d) The diameter of the Sun is 190 times that of the Earth
Explanation:
The predominant element in the earth's composition is 'Fe' (35%), while in the earth's crust is Oxygen (46%). The Sun contains more than 99% of the mass of the Solar System.
The diameter of Sun is 109 times that of the Earth.
472: The FAO accords the status of 'Globally Important Agricultural Heritage System (GIAHS)' to traditional agricultural systems. What is the overall goal of this initiative?
1. To provide modern technology, training in modern farming methods and financial support to local communities of identified GIAHS so as to greatly enhance their agricultural productivity
2. To identify and safeguard eco-friendly traditional farm practices and their associated landscapers, agricultural biodiversity and knowledge systems of the local communities
3. To provide Geographical Indication status to all the varieties of agricultural produce in such identified GIAHS
Select the correct answer using the code given below.
(a) 1 and 3 only
(b) 2 only
(C) 2 and 3 only
(d) 1, 2 and 3
473: With reference to the wetlands of India, consider the following statements :
1. The country's total geographical area under the category of wetlands is recorded more in Gujarat as compared to other States.
2. In India, the total geographical area of coastal wetlands is larger than that of inland wetlands.
Which of the statements given above is/are correct?
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2
Explanation:
Total geographical area under the category of wetlands:
1)Gujarat with 12,70,875 hectare of wetlands.
2) West Bengal with 5,53,090 hectare of wetlands.
Total geographical area of coastal wetlands is 4140116 hectare.
Total geographical area of inland wetland is 10564899 hectare.
hence the correct answer is (A).
474: Which one of the following conditions is most relevant for the presence of life on Mars ?
(a) Atmospheric composition
(b) Thermal conditions
(c) Occurrence of ice caps and frozen water
(d) Occurrence of ozone
Explanation:
The most relevant condition of the presence of life on Mars is occurence of ice caps and frozen water. Because the same situations, on the earth also, are supposed to support the primitive forms of life.
475: Consider the following crops of India :
1. Groundnut
2. Sesamum
3. Pearl millet
Which of the above is/are predominantly rainfed crop/crops?
(a) 1 and 2 only
(b) 2 and 3 only
(c) 3 only
(d) 1, 2 and 3
Explanation:
India is the one of the largest importers of edible oil because of the fact that groundnut is predominantly grown as rainfed crop under various biotic and abiotic stresses resulting in low yield.
Sesamum is mainly a rainfed crop and is grown on marginal, dry and slopy lands.
Unlike rice and wheat that require many inputs in terms of soil fertility and water, millets grow well in dry regions as rainfed crops.