Which of the following is included in biosphere 

A network of inter connecting food chains is known as

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

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

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

A system consisting of biotic and abiotic component is known as

Which of the following food chain starts with a plant.

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

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

Which of the following is the main by-product of photosynthesis.