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biology 0610printed 283 · PDF 283
328 pagesrevision 46933
printed 283 · PDF 283
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Marine conservationists are concerned that fish stocks in the sea are decreasing. Drastic
measures will have to be taken to stop the extinction of many fish species.
Fig. 5.1 shows a marine food web. Tuna are large carnivorous fish that are an important
human food. Dolphins may be caught in fishermen’s nets and die.
5> fishing boat
4- tuna dolphins
trophic | small carnivorous |
level 3 fish squid
2- herbivorous fish zooplankton
paotnayanane photosynthetic
1- algae growing lankton
on reefs P
Fig. 5.1
(a) State the names given to trophic levels 1 and 3.
1
3
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