The distribution of individuals in a population is otherwise known as dispersion.

The one way movement of individuals out of a particular population is called emigration.

A stable ecological system in which the biotic and abiotic communities are inseparably inter related with transfer and cycling of material is ecosystem.

The major biomes of the world are climax community.

An example of density dependent factor affecting population growth is competition.

The summer dormancy of animals, in order to avoid the effects of high temperature is called oestivation.

The ecosystem consisting of all running water systems like rivers, riverlets etc. is termed as lotic environment.

The immediate environment of organisms is called macro climate.

Cyclo morphosis is the phenomenon in which morphological alterations in the structure of organisms take place in response to variations in temperature.

The passage of energy through an ecosystem is via food chain.

The autotrophic components of the ecosystem are photo synthetic plants.

An example of a sedimentary cycle is phosphorous cycle.

The study of rhythmic, temporal periodicity in activities of living organisms constitutes the branch of science called chrono biology.

The fog deposited with smoke and chemical fumes forms a dark and thick covering called smog.

The air, water, noise, buildings, landscape, oceans, lakes, parks etc. are all parts of the complex entity called the environment.

Automobiles run by petrol and diesel produce carbon monoxide, which is a dangerous pollutant of air.

The loss and reduction of chlorophyll in leaves, resulting in the appearance of pale green or yellow patches on leaves is called chlorosis.

Due to its relatively stable temperature, the most constant of the three types of habitat is ocean.

The part of the ocean in which photosynthesis does not occur, is called aphotic zone.

In the ocean the microscopic plant occupies the upper layers, which is called pelagic zone.

All of the earth's living organisms interacting with the physical environments to maintain a steady state system constitute biosphere.

The visible light energy can be changed by the process of photosynthesis into chemical energy.

The total disappearance of species of organisms from the earth is called extinction.

Forestry aimed at meeting the fuel, fodder, fruit and timber needs of the people is called social forestry.

The animal products like ivory fur and hides are of tremendous economic value.