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प्रश्न
What are trophic levels? Give an example of a food chain and state the different trophic levels in it.
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उत्तर १
The various links or steps in a food chain at which the transfer of food and energy takes place are called trophic levels.
The producers form the first trophic level as they manufacture food. The primary consumers form the second trophic level, the secondary consumers form the third, and the tertiary consumers form the fourth trophic level.
In the above fig. The grass is the producer, which is eaten by the grasshopper, known as the primary consumer. Then the grasshopper is eaten by a shrew, a secondary consumer, and lastly shrew is eaten up by an owl, a tertiary consumer.
उत्तर २
The various steps in food chain at which transfer of food energy takes place are called trophic levels.
Example: Food chain operating in a grassland.
Grass → Insects → Frogs → Snakes
- Grass → 1 st trophic level
- Insects → 2 nd trophic level
- Frogs → 3 rd trophic level
- Birds → 4 th trophic level
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संबंधित प्रश्न
Which of the following are always at the second tropic level of food chains?
Why are green plants called producers?
We do not clean natural ponds or lakes but an aquarium needs to be cleaned regularly. Why is it so ? Explain.
Name the organisms belonging to the second and the fourth trophic levels in the food chain comprising the following :
Frogs, Plants, Snakes, Hawk, Insects
What is the role of decomposers in the ecosystem?
At which trophic level a person is feeding when he is eating fish.
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 in the food chain are herbivore, and carnivores?
In a food chain consisting of grass, frog, bird and insects, where will the concentration of the harmful chemicals be maximum?
An aquatic food chain comprises of the organisms like tadpoles, weeds, fish and water beetles. The organism which gets the minimum energy through this food chain is :
(a) water beetles
(b) tadpoles
(c) weeds
(d) fish
Arrange the following in a correct sequence and form a food chain
Rabbit → Carrot → Eagle → Snake
In a given food chain if the amount of energy at the fourth trophic level is 6 kJ, what will be the energy available at the producer level?
Green plants utilize ______ percent of sun’s energy to prepare their food by the process of photosynthesis.
In a food chain grasshopper gets energy by eating frog.
In the given food chain, suppose the amount of energy at the fourth trophic level is 5 kJ, what will be the energy available at the producer level?
Grass → Grasshopper → Frog → Snake → Hawk
Which group of organisms are not constituents of a food chain?
- Grass, lion, rabbit, wolf
- Plankton, man, fish, grasshopper
- Wolf, grass, snake, tiger
- Frog, snake, eagle, grass, grasshopper
In the following food chain, only 2J of energy was available to the peacocks. How much energy would have been present in Grass? Justify your answer.
GRASS → GRASS HOPPER → FROG → SNAKE → PEACOCK
Which statement is correct with respect to the food chain?
Assertion (A): The energy which passes to the herbivores does not come back to autotrophs.
Reason (R): The flow of energy in a food chain is unidirectional.
According to the 10% law, if producers in an ecosystem have 10,000 units of energy, approximately how much energy is available to primary consumers?
