IGCSE Biology Paper-3: Specimen Questions with Answers 290 - 290 of 358
Question 290
Write in Short
Short Answer▾5.1 desert food web.
(i) Use Fig. 5.1 to complete a food chain that has four different organisms and ends with the fox.
Write the names of three missing organisms in the boxes.
(ii) State the names of two top carnivores in the food web in Fig. 5.1.
Explanation
(i)
Food web refers to a group of inter- related food chains in a particular community. Under natural conditions, the linear arrangement of food chain hardly occurs & these remain indeed inter-connected with each other through different types of organisms at different trophic level. Simple food chains are very rare in nature. This is because each organism may obtain food from more than one tropic level. In other words, one organism forms food for more than one organism of the higher trophic level. Food webs are very important in maintaining equilibrium (homeostasis) of ecosystem.
Fox and Hawk
Other top carnivores hailed from five different families and included animals such as wolves, wild dogs, dingo, tigers, lions, cheetahs, jaguars, pumas, Eurasian lynx, sea otters, leopards, bears and hyenas.