The question asks to identify which option is NOT a suggested measure to prevent soil erosion. We need to evaluate each option based on its effectiveness in controlling soil erosion.
Correct Option: B) Building dams is NOT primarily a suggested measure to prevent soil erosion in the context of land management practices. While they can control flooding, their main function is not direct soil erosion prevention.
The question asks for the primary source of water for plants and animals based on a given passage (which is implied but not provided in the prompt). In the absence of a specific passage, we must rely on general scientific knowledge regarding the water cycle and the fundamental sources of water for life on Earth.
C) Rain or snowfall is the primary source of water for plants and animals. All other sources like groundwater, rivers, and wells are replenished by or originate from precipitation (rain and snowfall).
The question asks about the connection between afforestation and water conservation. We need to identify which option best describes how planting trees contributes to saving water, based on common ecological principles.
C) Afforestation prevents water wastage. This is the most direct and accurate connection. Trees reduce surface runoff, increase infiltration, and recharge groundwater, all of which are mechanisms to prevent water from being wasted (e.g., flowing away quickly into rivers and oceans without being utilized or stored in the soil/groundwater). The extensive root systems and forest litter act as natural sponges, holding water and releasing it slowly.
The question asks how the movement of water can serve additional purposes, according to an unprovided passage. Since the passage is not given, we must infer the most common and significant additional purposes of water movement that are generally recognized and often discussed in the context of resource management and development.
C) By supporting internal waterways and hydro-electric power. The movement of water is directly harnessed for navigation (internal waterways) and for generating electricity (hydro-electric power). These are primary examples of how water's movement serves significant additional purposes beyond basic consumption.
The question asks to identify the main cause of soil erosion among the given options. Soil erosion is the displacement of the uppermost layer of soil, primarily caused by water, wind, or tillage. We need to evaluate each option's impact on soil erosion.
B) Heavy rain with rapid water runoff is highlighted as the main cause because water, especially in the form of heavy rainfall and subsequent runoff, is a primary and powerful agent of soil erosion. It detaches soil particles and transports them away, leading to significant land degradation.
The question asks for a primary characteristic of rainfed tanks in South India based on information likely provided in a passage (though the passage itself is not given here). We need to infer the most distinguishing feature from the given options, assuming typical characteristics of such water bodies.
B) They reflect sunlight due to silt-laden water. Rainfed tanks collect water from surface runoff, which often carries soil particles (silt). This makes the water turbid or silt-laden. Such water, due to the suspended particles, scatters and reflects sunlight, which is a common visual characteristic of these tanks, especially after rainfall events.