In a terrestrial ecosystem, a much larger fraction of energy flows through the:

1.	DFC	2.	GFC
3.	Either of DFC or GFC	4.	Nither of DFC nor GFC

In an aquatic food chain, zooplankton occupy which trophic level?

Organisms at each trophic level depend on those at the lower level trophic level for their energy demands except:

Each trophic level has a certain mass of living material at a particular time, best called as:

Approximately, what percent of energy is transferred to each trophic level from the lower trophic level in an ecosystem?

Identify the correct statements: 

Identify the incorrectly matched pair:
1. Carnivores -- secondary or tertiary consumer
2. Decomposers -- microbial heterotrophs
3. Herbivores -- primary consumer
4. Omnivores -- molds, yeasts and mushrooms

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

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. $(\mathrm{kcal} {\mathrm{m}}^{-2}) {\mathrm{yr}}^{-1}$

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