Which of the following element  is very significant in the environment.

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

Which of the following food chain starts with a plant.

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

Marine eco-system includes the oceans, estuaries and 

Tropical grasslands are also known as

Which of the following constituent of the atmosphere comprising about seventy-nine percent of the atmospheric gases.

Terrestrial eco-system can be further be classified into 

Who converts some of the consumed carbohydrates into carbondioxide for release into the air through respiration.

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