The question asks to identify which option is NOT a natural carbon sink. A carbon sink is any natural or artificial reservoir that absorbs and stores more carbon from the atmosphere than it releases. We need to evaluate each option based on this definition.
Correct Option: D) Depleted oil reserves are not natural carbon sinks. They are geological formations that once held fossil fuels, which are carbon sources when extracted and burned. While they might be considered for artificial carbon storage in the future, they do not naturally absorb carbon from the atmosphere.
With reference to micro-irrigation.which of the following statements is/are correct ?
1. Fertilizer/ nutrients loss can be reduced .
2.It is the only means of irrigation in dry land farming.
3. In some areas of farming ,recding of ground water table can be checked.
Select the correct answer using the codes given below :
UPSC - 2011
The question asks to identify the correct statements regarding micro-irrigation. We need to evaluate each statement based on the principles and benefits of micro-irrigation techniques like drip and sprinkler irrigation.
C) 1 and 3 only — Statements 1 and 3 are correct as micro-irrigation reduces nutrient loss through precise application and helps conserve groundwater due to its high water use efficiency.
The question asks about the potential impacts of the proper and complete implementation of the National Water Mission (NWM) in India. To answer this, one needs to understand the key objectives and strategies of the NWM.
B) 1 and 2 only. Statements 1 and 2 accurately reflect the objectives and strategies of the National Water Mission, which focuses on water conservation, efficient use, and exploring alternative sources like recycled wastewater and desalinated ocean water for specific needs.
The question asks to identify a step involved in Carbon Capture and Storage (CCS). CCS is a process that captures carbon dioxide (\(\text{CO}_2\)) emissions from large point sources, such as power plants and industrial facilities, and prevents them from entering the atmosphere. The process typically involves three main stages: capture, transport, and storage.
C) Transporting captured \(\text{CO}_2\) to a storage location is a crucial and distinct step in the Carbon Capture and Storage (CCS) process. After \(\text{CO}_2\) is captured, it must be moved to a site where it can be safely and permanently stored underground.
UPSC - 2013
The question asks for the correct sequence of ecosystems in decreasing order of productivity. Productivity in an ecosystem refers to the rate at which biomass is produced, often measured as net primary productivity (NPP). We need to compare the NPP of mangroves, grasslands, lakes, and oceans.
C) Mangroves, grasslands, lakes, oceans. This sequence correctly orders the ecosystems from highest to lowest productivity. Mangroves are among the most productive ecosystems, followed by grasslands, then lakes, and finally, the open oceans which have the lowest average productivity.
The question asks about the significances of the Sustainable Sugarcane Initiative (SSI). We need to evaluate each given statement against the principles and practices of SSI to determine its correctness.
B) 1, 2 and 4 only
Based on the analysis, statements 1, 2, and 4 are correct, while statement 3 is incorrect. Therefore, option B is the correct answer.