Answer: Option [B]If the size of an individual particle in the soil has a diameter of less than 0.002 mm, the soil is known as Clay. Soil particles vary greatly in size, and soil scientists classify soil particles into sand, silt, and clay. Starting with the finest, clay particles are smaller than 0.002 mm in diameter. Some clay particles are so small that ordinary microscopes do not show them. Silt particles are from 0.002 to 0.05 mm in diameter.
Answer: Option [D]The correct answer is South America. Cortaderia selloana is a species of flowering plant in the Poaceae family. It is referred to by the common name pampas grass, and is native to southern South America, including the Pampas region after which it is named.
Answer: Option [C]The correct answer is 55dB. In industrial areas, the permissible limit is 75 dB for daytime and 70 dB at night. In commercial areas, it is 65 dB and 55 dB, while in residential areas it is 55 dB and 45 dB during daytime and night respectively.
Answer: Option [A]The correct answer is Bhagalpur. Bhagalpur in Bihar is going to get North India's first and India's fourth bird ringing station. Other three bird ringing stations are at Tamilnadu (Chennai), Rajasthan (Jaipur), Orissa (Bhuvneshwar). Bird ringing station has been established for observation, monitoring, and research on migratory birds.
Answer: Option [C]The correct answer is Quaternary extinction. The Quaternary period has seen the extinctions of numerous predominantly megafaunal species, which have resulted in a collapse in faunal density and diversity and the extinction of key ecological strata across the globe.
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