अध्याय 6 पृथ्वी की प्रमुख स्थालरूप

1. Which of the following leaf modifications occur(s) in the desert areas to inhibit water loss? (UPSC/ IAS 2013)

1. Hard and waxy leaves
2. Tiny leaves
3. Thorns instead of leaves

Select the correct answer using the code given below

2. Consider the following pairs:

Which of the pairs given above are correctly matched? (UPSC/ IAS 2018)

3. With reference to the Genetically Modified mustard (GM mustard) developed in India, consider the following statements : (UPSC/ IAS 2018)

1. GM mustard has the genes of a soil bacterium that give the plant the property of pest-resistance to a wide variety of pests.
2. GM mustard has the genes that allow the plant cross-pollination and hybridization.
3. GM mustard has been developed jointly by the IARI and Punjab Agricultural University.

Which of the statements given above is/are correct ?

4. In which one of the following States is Pakhui Wildlife Sanctuary located? (UPSC/ IAS 2018)

5. Which of the following has/have shrunk immensely/dried up in the recent past due to human activities ? (UPSC/ IAS 2018)

1. Aral Sea
2. Black Sea
3. Lake Baikal

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6. Among the following cities, which one lies on a longitude closest to that of Delhi? (UPSC/ IAS 2018)

7. The Earth’s magnetic field has reversed every few hundred thousand years. (UPSC/ IAS 2018)

1. When the Earth was created more than 4000 million years ago, there was 54% oxygen and no carbon dioxide.
2. When living organisms originated, they modified the early atmosphere of the Earth.

Which of the statements given above is/are correct?

8. With reference to the circumstances in Indian agriculture, the concept of “Conservation Agriculture” assumes significance. Which of the following fall under Conservation Agriculture? (UPSC/ IAS 2018)

1. Avoiding the monoculture practices
2. Adopting minimum tillage
3. Avoiding the cultivation of plantation crops
4. Using crop residues to cover the soil surface
5. Adopting spatial and temporal crop sequencing/crop rotations

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9.  Consider the following pairs :

Which of the pairs given above are correctly matched ? (UPSC/ IAS 2018)

10. Which one of the following is an artificial lake? (UPSC/ IAS 2018)

11. Consider the following statements (UPSC/ IAS 2018)

1. Most of the world’s coral reefs are in tropical waters.
2. More than one-third of the world’s coral reefs are located in the territories of Australia, Indonesia and the Philippines.
3. Coral reefs host far more animal phyla than those hosted by tropical rainforests.

Which of the statements given above is/are correct?

12. Which of the following is/are the possible consequence/s of heavy sand mining in riverbeds? (UPSC/ IAS 2018)

1. Decreased salinity in the river
2. Pollution of groundwater
3. Lowering of the water table

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13. Consider the following statements: (UPSC/ IAS 2018)

1. The Barren Island volcano is an active volcano located in the Indian territory.
2. Barren Island lies about 140 km east of Great Nicobar.
3. The last time the Barren Island volcano erupted was in 1991 and it has remained inactive since then.

Which of the statements given above is/are correct?

14. With reference to agricultural soils, consider the following statements : (UPSC/ IAS 2018)

1. High content of organic matter in soil drastically reduces its water holding capacity.
2. Soil does not play any role in the sulphur cycle.
3. Irrigation over a period of time can contribute to the salinization of some agricultural lands.

Which of the statements given above is/are correct?