Exam 25: Ecology

Movement of materials through any community can be tracked by developing a/an ________ for that community.

Loss of nitrogen from the soil occurs as a result of which of the following?

Carbon dioxide comprises approximately what percentage of the atmosphere?

Primary succession usually takes place in areas previously covered with vegetation.

________ and ________ are the two common gases that lessen re-radiation of heat back into the space and, hence, contribute to increasing temperatures on Earth.

Weedy plant species are ________.

As much as 90% or more of the carbon dioxide needed throughout the earth for photosynthesis is produced by

Microorganisms that gain access to various plants, particularly legumes, usually do so through or as a result of which of the following?

When a grass plant is eaten by an herbivore, which in turn is eaten by a carnivore, this is an example of a

Which of the following estimates or calculations are made with respect to populations?

Phenology refers to the timing of developmental events, such as germination, flowering and seed production, in the life cycle of a plant

The factors that allow organisms to grow, compete, reproduce, and perpetuate the species in a particular area are part of a field of inquiry called

The structure produced when nitrogen-fixing bacteria infect legume plants and forms a symbiotic relationship is called a(an) ________.

When nitrogen from the air is converted to ammonia or other nitrogenous compounds by microorganisms, it is said to be

Fires benefit both grassland and forest vegetation by converting dead organic materials to nutrient-rich ash.

Loss of nitrogen from the soil due to a fire may be offset by which of the following?

All the living organisms plus the environmental factors present in a given area constitute

The foremost ecosystem decomposers are

The majority of chaparral species, both woody and herbaceous, are so adapted to fire that their seeds will not germinate, as a rule, until fires remove accumulated litter.

Carbon dioxide is taken up during respiration and the decay process.