Trophic Level Test

What is an autotroph?

• An organism that consumes other organisms.

• A type of animal that lives in water.

• A microorganism that decomposes organic matter when no one else can.

• A plant that requires sunlight only at night.

• An organism that produces its own food.

Out of the following examples, select all that are heterotrophs

• Human

• Coconut

• Bear

• Microalgae

• Grasshopper

A particular plot of land can produce 700 kg of beef per hectare. Beef sells for $4/kg. If that land is converted to producing corn, which sells for $0.15/kg, approximately how much will the farmer make selling corn? Assume 10 percent ecological efficiency

• 100$

• 500$

• 1000$

• 3000$

At which trophic level are snakes that consume fish that consume zooplankton that eat algae?

• Producers.

• Primary Consumers.

• Secondary Consumers.

• Tertiary Consumers.

Which food chain from the Serengeti Plain is in the correct sequence from lowest to highest trophic level?

• shrubs–buffalos–lions–decomposers

• shrubs–decomposers–lions–buffalos

• buffalos–decomposers–lions–shrubs

• decomposers–lions–shrubs–buffalos

Which is true about the movement of matter and energy in an ecosystem?

• Energy and matter both cycle through an ecosystem.

• Energy and matter both flow through an ecosystem.

• Matter flows and energy cycles through an ecosystem.

• Matter cycles and energy flows through an ecosystem.

Explain why only 10% of the energy is passed from one trophic level to another

Based on this food web, explain in how many order of consumers the leopard seal can be in and give at least 2 examples of food chains that contain the leopard seal as the apex predator.

Based on the population table from the food web presented before, what is the most likely explanation for the changing of the abundance of these 3 species in each location?

Calculate the passing of energy from:
a. producers to primary consumers
b. primary consumers to secondary consumers
c. secondary consumers to teartiary consumers
For each case: how does it compare to the 10% rule?