Indian army has published the notification for SSC Tech 56 men and SSC Tech 27 women for the course commencing at OTA Chennai from April 2021
Which of the following is/are the possible consequences/s of heavy sand mining in riverbeds?
1. Decreased salinity in the river
2. Pollution of groundwater
3. Lowering of the water table
Select the correct answer using the code given below:
1 only
2 and 3 only
1 and 3 only
1, 2 and 3
With reference to agricultural soils, consider the following statements:
1. A 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?
1 and 2 only
3 only
Consider the following statements:
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.
2 and 3
1 and 3
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 territories of Australia, Indonesia and Philippines.
3. Coral reefs host far more number of animal phyla than those hosted by tropical rainforests.
Why is a plant called Prosopis juliflora often mentioned in news?
Its extract is widely used in cosmetics.
It tends to reduce the biodiversity in the area in which it grows.
Its extract is used in the synthesis of pesticides.
None of the above
