Ecosystem- Quiz 2

Which of the following organisms and trophic levels is mismatched?

• algae—producer

• phytoplankton—primary consumer

• fungi—detritivore

• bobcat—secondary consumer

Which of the following is not a part of either gross or net primary production in plants?

• Light reflected from the leaf

• Energy fixed into glucose

• Energy expended in moving material through membranes

• Energy used to excite a chlorophyll electron

Assuming that the energy transfer efficiency between trophic levels is 10%, how much grain would be required to produce 70 kg of human biomass if the grain is eaten by cows and the cows are eaten by humans?

• 210 kg

• 700 kg

• 2,100 kg

• 7,000 kg

The amount of energy reaching an upper trophic level is determined by

• net primary production.

• net primary production and the efficiencies with which food energy is converted to biomass.

• gross primary production.

• gross primary production and the efficiencies with which food energy is converted to biomass.

In an ecosystem, the population of

• Primary producer is greater than primary consumers

• Secondary consumers is largest

• Primary consumers out number primary

• Primary consumer is least dependent upon primary producers.

Which is correct sequence in the food chain?

•  $Grass\longrightarrow Wolf\longrightarrow Deer\longrightarrow Buffalo$  

•  $Bacteria\longrightarrow Grass\longrightarrow Rabbit\longrightarrow Wolf$  

•  $Grass\longrightarrow In\sec t\longrightarrow Bird\longrightarrow Snake$  

•  $Grass\longrightarrow Snake\longrightarrow In\sec t\longrightarrow Deer.$  

When a big fish eats a small fish which eats water fleas supported by phytoplankton, the water fleas are :

• Producer

• Primary consumers

• Secondary consumers

• Top consumer in this top chain.

Ecosystem has two components

• Plants and animals

• Weeds and trees

• Biotic and abiotic

• Frogs and man.

In a food chain, herbivores are

• Primary consumers

• Primary producers

• Secondary consumers

• Decomposers.

Second most important trophic level is a lake is

• Phytoplankton

• Zooplankton

• Benthos

• Fishes.