Maximum ozone concentration is
One part per hundred
One part per thousand
One part per million
One part per billion
Soil formed by transportation of disintegrated parent material from one place to another is called
Which one of the following is not a matching pair of certain organism(s) and the kind of association?
If the high altitude birds become rare or extinct, the plants which may disappear along with them are
Gloger's rule related to the
Ratio between mortality and natality is called