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प्रश्न
Give two differences between food chain and food web.
उत्तर
| Food chain | Food web |
| The sequence of living organisms in a community in which one organism consumes another for the transfer of food energy is called a food chain. | The inter-connected food chains operating in an ecosystem, which establish relationships among various species, make up a food web. |
| It represents a unidirectional flow of energy. | It represents the numerous pathways along which food energy flows. |
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संबंधित प्रश्न
"Energy flow in a food chain is unidirectional" Justify this statement.
Draw the food chain with four trophic levels.
At which trophic level a person is feeding when he is eating bread.
Which of the following are decomposers of dead organisms?
| Bacteria | Fungi | Viruses |
| (a) no | yes | yes |
| (b) yes | no | yes |
| (c) yes | yes | no |
| (d) yes | yes | yes |
The sea water contains water beetles, tadpole, fish and weeds.
Which organisms can trap solar energy to make food?
Match the terms given in column I with the terms given in column II and column III having the same meaning :
| Column I | Column II | Column III |
| (1) Secondary consumer | Herbivore | 1st trophic level |
| (2) Primary consume | Autotroph | 3rd trophic level |
| (3) Producer | Carnivore | 4th trophic level |
| (4) Tertiary consumer | Large carnivore | 2nd trophic level |
If a harmful chemical enters a food chain comprising cat, mice and plants, which one of these organisms is likely to have the maximum concentration of the harmful chemical in its body?
Name two predators of snakes in a food web operating in a forest ecosystem.
What percentage of sun's energy falling on the leaves of green plants is utilised by the plants in the process of photosynthesis and stored as chemical energy of food?
(a) 99 per cent
(b) 10 per cent
(c) 1 per cent
(d) 20 per cent
If the energy available at the producer level in a food chain is 150 J, how much energy will be transferred to : tertiary consumer?
(a) 15 J
(b) 10 J
(c) 1.50 J
(d) 0.15 J
