Biology Questions and Answers
- How is energy transferred
along a food chain?
The energy flux along a food chain is
alwaysproducers to t unidirectional, fhe decomposers.rom the
- What are trophic levels?
How many trophic levels can a
food chain have?
Trophic levels corron a food chain. Therefore producersespond to positions
always belong to the first trophic level
and decomposers to level, consumers that dithe last troprectly eat thehic (^)
producers belong to the second trophic
level and so on.
There is no limit regarding the numberof trophic levels on a chain, since many (^)
orders of consumers can exist.
- What are primary
consumers? Can a food chain
present quaternary consumers
without having secondary or
tertiary consumers? Can a
tertiary consumer of one chain
be a primary or secondary
consumer of another chain?
Primary consumthat eat autotropers are living hic beings, i.e., theybeings (^)
eat the producers. Primaryalways belong to the second trophic consumers
level of a chain.
A food chain superior orders withocannot hut havinave consumers og the f
consumer of the inferior orders. A
consumer several different chains not alwayshowever can participate i n
belonging to the same consumer order
in each of them.
- What is the difference
between the concepts of food
chain and food web?
The chain concept is a theoretical model
to study the energy flux in ecosystems.Actually in an ecosystem the organisms (^)
are part of several intchains, forming a food web. Thereforeerconnected food
the chain is a theoretical linear
sequence and the web is a morealistic representation of nature inre (^)
which the food chains interconnect
forming a web.
- What are the three main
types of trophic pyramids
studied in Ecology?
The three types of trophic pyramids
studied in Ecology arpyramid, the biomasse the numeric pyramid and the (^)
energy pyramid.
Generally the variable dimension of the
pyramid is thalways the same fe width, or each representeand the height isd
strata of living beings. The width
therefore representsindividuals, or the total mass o the number off these (^)
individuals or the available energy in
each trophic level.
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