Organisms and their environment

decomposer

consumer

producer

It is destroyed after it is used up

It is used for life processes like movement, creating offspring producing waste or lost as body heat

It is used to grow plants

It is lost completely as body heat

A

B

the total dry weight of organisms in an ecosystem

the total weight of organisms in an ecosystem

the total dry weight of producers in an ecosystem

the total weight of animals in an ecosystem

It's far easier to draw a pyramid that way.

Because energy is lost at each level, there isn't enough energy left to support any more consumers.

Generally a top predator is so fierce it has no predators and therefore can rule the top trophic level without fear.

There simply is not a word beyond quaternary.

BTW the word after quaternary is quinary (always read all the options in multiple choice questions)

the number of individual organisms at each trophic level

the number of individuals in each population

the number of predators and prey in an ecosystem

the number of different populations at each trophic level

10%

0.1%

90%

It totally depends on the ecosystem.

quadrats should be placed randomly so that a representative sample is taken

you should look at the results from several quadrats in an area to reduce the effect of an unusual distribution

the results are more reliable when you look at the results from many quadrats

All the above are true

Counting Random Plants

Using Quadrates

Using Pooters

Using Pitfall traps

Increase in predators leads to decrease in prey

Increase in predators leads to increase in prey

Increase in predators leads to decrease in producers

Increase in producers leads to increase in prey