How can population size be measured?

Assertion : The rate at which a population can be expected to grow in the future can be assessed graphically by means ofa population pyrmid. Reason : A triangular population pyramid is characteristics of a country whose population is stable, neither growing nor shrinking.

Growth in plants can be measured in terms of

The carrying capacity of environment for a given population can be represented by the equation

Show how impulse force can be measured graphically

Assertion : Prolonged intraspecific competition causes an increases in the size of the niche of a population. Reason : In such a population, use of a new type of resource will increase through the generations.

Which of the following statements are correct? (i) A physical quantity cannot be measured (ii) A physical quantity can be measured (iii) The units of physical quantity can be derived (iv) A physical quantity can neither be a scalar nor a vector