Food chain
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Grass → grasshopper → frog → snake → hawk
- 50 KJ
- 5 KJ
- 500 KJ
- 5000 KJ
During the transfer of energy across the food chain, only about 10% of available energy is transferred to the next higher trophic level. Where does the rest 90% of the energy go?
The concentration of chemical food contaminants is higher in birds of prey than in many of the individual organisms that they eat. Which of the following statements best explains the reason for the higher concentration of food contaminants in birds of prey?
Birds of prey store more of the food they eat.
Birds of prey catch animals with chemical contaminants more easily.
Only birds of prey store chemical contaminants.
Chemical contaminants are stored and magnified in organisms higher up the food chain.
Populations of insects and green plants in a particular region is always balanced.This balance and equilibrium is achieved by various processes in:
Plant community
Insect community
Ecosystem
Microbial community
Which part of a food chain is affected by one animal becoming extinct?
The whole food chain is affected.
Producers and decomposers are affected.
Only animals at the top of the food chain are affected.
Only plants and animals at the bottom of the food chain are affected.
Which of the following is a correct reason for the assertion that "pesticides are said to move up the food chain”?
Pesticides has a greater effect on larger animals than on insects.
Top predators often accumulate the pesticides contained in the bodies of their prey.
Pesticides kill insects and other target pests before they can absorb the poison.
Birds and predatory mammals are not affected by pesticides.