A. All the atmospheric gases
B. Only carbon, hydrogen and oxygen
C. Energy only
D. All the above components
Related Mcqs:
- In a comparative study of grassland ecosystem and pond ecosystem it may be observed that:
A. Primary and secondary consumers are similar
B. Both biotic and abiotic components are different
C. The biotic components are almost similar
D. The abiotic components are almost similar - Exotic species, which brought for plantation from some other country to our country or even from one ecosystem to other ecosystem are called, as exotic species like:
A. Pinus nigra – Japan
B. Euralyptus – Australia
C. Polunia – China
D. All of the above - An ecosystem may be defined as:
A. A localized association of several plants and animals
B. Different communities of plants, animals and microbes, together with their physico-chemical environments
C. Different communities of plants and microbes plus their physico-chemical environments
D. None of the above - The importance of ecosystem lies in:
A. Cycling of materials
B. Flow of energy
C. Both (a) & (b)
D. None of the above - The biotic and abiotic components of the ecosystem are connected through:
A. Standing quality
B. Climatic regime
C. Transducers
D. Humification and mineralization - Every ecosystem must have a continuous external source of:
A. Energy
B. Oxygen
C. Living organism
D. Bacteria - The cybernetics of an ecosystem refers to:
A. Harvest index
B. A feedback mechanism
C. Regulation of equilibrium
D. Reverse energy flow - The term homeostasis in an ecosystem refers to:
A. A feedback mechanism
B. A self-regulatory mechanism
C. State of equilibrium
D. Influence of production - Ecosystem receives nitrogen from outside through:
A. Biological nitrogen fixation
B. Electrification of nitrogen
C. Industries
D. All the above - Which ecosystem has the highest primary productivity?
A. Pond ecosystem
B. Lake ecosystem
C. Grassland ecosystem
D. Forest ecosystem
