The process of mineralization by micro-organisms helps in the release of:

1.	Inorganic nutrients from humus
2.	Both organic and inorganic nutrients from detritus
3.	Organic nutrients from humus
4.	Inorganic nutrients from detritus and formation of humus

Productivity is the rate of production of biomass expressed in terms of :
i. $(\mathrm{kcal} {\mathrm{m}}^{-3}) {\mathrm{yr}}^{-1}$
ii. $\mathrm{g} {\mathrm{m}}^{-2} {\mathrm{yr}}^{-1}$
iii. $\mathrm{g} {\mathrm{m}}^{-1} {\mathrm{yr}}^{-1}$
iv. $(\mathrm{kcal} {\mathrm{m}}^{-2}) {\mathrm{yr}}^{-1}$

An inverted pyramid of biomass can be found in which ecosystem?

Which of the following is not a producer?

Which of the following ecosystems is most productive in terms of net primary production? 

Pyramid of numbers is :
1. Always upright
2. Always inverted
3. Either upright or inverted
4. Neither upright nor inverted

Approximately how much of the solar energy that falls on the leaves of a plant is converted to chemical energy by photosynthesis? 

Among the following, where do you think the process of decomposition would be the fastest?

How much of the net primary productivity of a terrestrial ecosystem is eaten and digested by herbivores? 

During the process of ecological succession, the changes that take place in communities are :
1. Orderly and sequential
2. Random
3. Very quick
4. Not influenced by the physical environment