Organisms and Population (part-1)

What is population? How many marks carried by the chapter Organisms and Population in class 12 board examinations? Why we study the chapter Organisms and Population? How important the chapter Organisms and Population is?

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Physiological ecology which tries to understand how different organisms are adapted to their environments in terms of not only survival but also reproduction. You have already learnt in earlier classes that how the rotation of our planet around the Sun and the tilt of its axis cause annual variations in the intensity and duration of temperature, resulting in distinct seasons