Study of inter-relationship of organs and their environment is called :

All organic compounds contain :

The organism and the physical environment of the habitat form an ecological complex called :

Among the following which one is a abiotic component of the environment ?

Which is an essential element required by organisms to synthesize proteins and nucleic acids ?

Which gas is taken up by man and animals during respiration ?

The life sustaining zone of earth, where lithosphere, hydrosphere and atmosphere interact is called :

During photosynthesis which gas is liberated in the atmosphere ?

The energy trapped by green plants is relayed through a series of heterotrophic organisms, this process is called :

One gallon is equivalent to :