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The rapidly growing mass of phytoplankton covering the surface water of a lake or pond is known as:
Who had used the term “Ecology” first time?
Man can maintain an ecological balance in the biosphere by:
Ultraviolet radiation in the stratosphere is absorbed by:
The temperature increases rapidly above:
Asteroids have their orbits between which of the following planets?
The amount of insolation received at a place on the surface of the earth depends upon:
A federal structure for India was first put forward by the:
Mica is found in which one of the following pairs of rocks?
“Tidal forest” is otherwise called: