What do secondary carnivores refer to?
a. Animals at second trophic level
b. Those animals that depend on the herbivores for food
c. Those animals that depend on the primary carnivores for food
d. Those animals that depend on the secondary herbivores for food

The detritus food chain (DFC) begins with________________. It is made up of decomposers which are ______________organisms, mainly________________. They meet their energy and nutrient requirements by degrading ______________.
a. detritus, heterotrophic, earthworm and dead organic matter.
b. dead organic matter, heterotrophic, fungi and bacteria, dead organic matter.
c. dead organic matter, autotrophic, fungi and plants, dead organic matter.
d. grass, heterotrophic, fungi and bacteria, dead organic matter.

What is the major conduit for energy flow in an aquatic ecosystem?
a. Grazing food chain
b. Detritus food chain
c. Sun
d. Hydrothermal vents

Identify the odd one out.
a. Cockroach
b. Crow
c. Humans
d. Goat

“Detritus food chain may be connected with the grazing food chain at some levels” this is evident from
(i). Some of the organisms of DFC are prey to the GFC animals
(ii). In a natural ecosystem, some animals like cockroaches, crows, etc., are omnivores.
(iii). Some of the organisms of GFC are facultative decomposers
a. i and iii
b. i and ii
c. ii and iii
d. i only

What do you mean by a foodweb?
a. Group of food chains.
b. Food chains present in a particular area
c. Natural interconnection of food chains
d. Food chains formed by members of a genus

Based on the source of organism’s nutrition or food, they occupy a specific place in the food chain that is known as-
a. Strata
b. Trophic level
c. Sere
d. Chain level

What do you mean by the standing crop?
a. Crop in a field at a given time
b. Each trophic level has a certain mass of living material at a particular time.
c. Each trophic level has a certain mass of organic material at a particular time.
d. Top trophic level has a certain mass of organic material at a particular time.

The standing crop is measured as the-
a. Mass of living organisms in a unit area.
b. The number of living organisms in a unit area.
c. Calculated from the net primary productivity
d. Both a and b.

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.