Environmental Science
Man made sources of radiation pollution are:

mining
nuclear fuels and preparation of radioactive isotopes
all of these
explosion of nuclear weapons

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Environmental Science
Which among the following is related to the word Mesoderm ?

Binomial system of classification
No membrane-bound organelles, no peptidoglycan in cell walls, introns
Forms blood and bone (leads to complex internal organs)
Anatomically advanced animals having all three germ layers

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Environmental Science
The aurora is produced by:

Fast-moving charged particles colliding with air molecules
Scattering of sunlight in the upper atmosphere
The combination of molecular and atomic oxygen to form ozone
Reflections of sunlight by polar ice fields
Burning oxygen caused by the intense sunlight at high altitude

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