Which of the following is the ecological sense that the totality of the physical and chemical factors that constitute the general environment.

During which process carbondioxide is converted into organic compounds and oxygen

Terrestrial eco-system can be further be classified into 

During photosynthesis, carbondioxide combines with water in the presence of sunlight to form

Marine eco-system includes the oceans, estuaries and 

The study of the earth as a household, of plants, human beings, animals and micro-organisms is called

Tropical grasslands are also known as

Which of the following is disturbed due to natural hazards, human interference and introduction of exotic species.

Which is the basic source of energy on which all life depends

The burning of fossil fuels has the greatest and most direct impact on