Match the following and select the correct option: 
Edaphic factor refers to:
An abiotic factor relating to the physical or chemical composition of the soil found in a particular area.
Example: Very alkaline soil may be an edaphic factor limiting the variety of plants growing in a region.
Vertical distribution of different species occupying different levels in a biotic community is known as: [2015 RS]
The mass of living material at a trophic level at a particular time is called: [2015 RS]
Standing crop is the amount of living biomass in an ecosystem. It indicates the productivity & luxuriance of growth. It is expressed in the form of number or biomass of organisms per unit area
In an ecosystem the rate of production of organic matter during photosynthesis is termed as: [2015 RS]
Gross Primary Productivity (GPP) is the rate of production of biomass or accumulation of energy by green plants per unit area per unit time. GPP depends on the chlorophyll content.
Secondary Succession takes place on/in: [2015 RS]
Secondary succession takes place in disturbed area having poor vegetation.
The following graph depicts changes in two populations (A and B) of herbivores in a grassy field A possible reason for these changes is that: [2015 RS]
The given graph illustrates that population B got success in the grassy field in comparison to population A.
During ecological succession: [2015 RS]
The gradual and predictable change, in the composition of species takes place in a given area during ecological succession.
Increase in concentration of the toxicant at successive trophic levels is known as: [2015 RS]
Biomagnification means an increase in concentration of toxins through the trophic levels of a food chain.
Industrial melanism is an example of: [2015 RS]
Industrial melanism occured in England due to industrial revolution. It caused black coating of moths for the adaptation in the present environment.
In which of the following both pairs have a CORRECT combination? [2015 RS]
During biological nitrogen fixation, inactivation of nitrogenase by oxygen poisoning is prevented by: [2015 RS]
Leghemoglobin prevents oxygen poisoning which causes inactivation of nitrogenase.
An association of individuals of different species living in the same habitat and having functional interactions is: [2015 RS]
Biotic community is an association of individuals of different species living in the same habitat and showing functional interactions.
Which of the following is a characteristic feature of the cropland ecosystem? 
Cropland ecosystem is largest anthropogenic ecosystem characterized by less diversity and high productivity.
Which of the following would appear as the pioneer organisms on bare rocks? 
The term ecosystem was coined by
The term ecosystem was first used in 1935 in a publication by British ecologist Arthur Tansley.