Why does the number of trophic levels in the grazing food chain is restricted ?
a. As the transfer of energy follows 10 per cent law
b. So that food chain remains short
c. As there are few species the community
d. So that transfer of energy could be more efficient.

What does 10 per cent law say?
a. Less than 10 per cent of the energy is transferred to each trophic level from the lower trophic level
b. Only 10 per cent of the energy is transferred to each trophic level from the lower trophic level
c. Only 10 per cent of the energy is assimilated from the eaten food
d. Consumer gains 10 per cent mass of the consumed food

The base of each pyramid represents the _________or the ___________level while the apex represents ____________

a. Consumers, first trophic and top trophic level
b. Producers, first trophic and top trophic level
c. Producers, second trophic and top trophic level
d. Consumers, second trophic and top trophic level

Identify the relationship represented by the pyramid

a. Pyramid of number
b. Pyramid of biomass
c. Pyramid of energy
d. None of the above

Which of the following pyramid represents the pyramid of number in grassland?

                   A                                               B                                               C

a. A
b. B
c. C
d. B & C

Which of the following statement is incorrect?
a. Only three top-carnivores are supported in an ecosystem based on production of nearly 6 million plants.
b. Pyramid of biomass shows a sharp increase in biomass at higher trophic levels.
c. Pyramid of biomass is inverted if small standing crop of phytoplankton supports large standing crop of zooplankton.
d. Pyramid of energy is always upright.

If the available energy at first trophic level is 10000 J then how much trophic levels it could support further?
a. 2
b. 3
c. 4
d. 5

Which of the following statement is incorrect?
a. Any calculations of energy content, biomass or numbers, has to include all organisms at that trophic level.
b. The base of each pyramid represents the producers or the first trophic level while the apex represents tertiary or top level consumer
c. The trophic level represents a functional level, not a species as such.
d. A given species occupy only one trophic level in the same ecosystem at the same time.

The pyramid of biomass in sea is generally-
a. Upright
b. Inverted
c. Bell shaped
d. Rectangular, stable.

Why does pyramid of energy is always upright?
a. Because energy can not be destroyed.
b. Smaller organisms have more potential energy than larger ones
c. Because when energy flows from a particular trophic level to the next trophic level, some energy is always lost as heat at each step.
d. More than one statement is correct.