Ecology Part 1 Quiz

Which of the following descriptions about the organization of an ecosystem is correct?

• Communities make up species, which make up populations.

• Populations make up species, which make up communities.

• Species make up communities, which make up populations.

• Species are grouped in populations, which make up communities.

The simplest grouping of more than one kind of organism in the biosphere is a(an)

• population.

• community.

• ecosystem.

• species.

The algae at the beginning of the food chain illustrated above is a __

• consumers.

• decomposers.

• producers.

• heterotrophs.

An organism that uses energy to produce its own food supply from inorganic compounds is called a(an)

• heterotroph.

• consumer.

• detritivore.

• autotroph.

Which of the following organisms does NOT require sunlight to live?

• chemosynthetic bacteria

• algae

• trees

• photosynthetic bacteria

The total amount of living tissue within a given trophic level is called the

• organic mass.

• trophic mass.

• energy mass.

• biomass.

What animals eat both producers and consumers?

• herbivores

• omnivores

• chemotrophs

• autotrophs

A snake that eats a frog that has eaten an insect that fed on a plant is a

• first-level producer.

• first-level consumer.

• second-level producer.

• third-level consumer.

Only 10 percent of the energy stored in an organism can be passed on to the next trophic level. Of the remaining energy, some is used for the organism’s life processes, and the rest is

• used in reproduction.

• stored as body tissue.

• stored as fat.

• eliminated as heat.

What is the process by which bacteria convert nitrogen gas in the air to ammonia?

• nitrogen fixation

• excretion

• decomposition

• denitrification