Question
Name two common pathogens in polluted water.
Name two common pathogens in polluted water.
Pathogens like bacteria, viruses, protozoan worms and protozoa usually from sewage waste, cause water pollution. Eg-Coliform bacteria cause water pollution.
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What is the function of lateral meristem?
Sound produced by a thunderstorm is heard 10s after the lightning is seen. Calculate the approximate distance of the thunder cloud. (Given speed of sound = 340m s–1.)
The audible range of frequencies of an average human ear is from 20Hz to 20kHz. Calculate the corresponding wavelengths. (Speed of sound in air is 344ms-1).
Mention two uses of multiple reflections of sound.