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प्रश्न
Which category of organisms forms the starting point of a food chain?
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उत्तर
Producers (green plants) form the starting point of a food chain.
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संबंधित प्रश्न
Give reason to justify the following: The existence of decomposers is essential in a biosphere.
The first trophic level in a food chain is always a green plant. Why ?
What are trophic levels? Give an example of a food chain and state the different trophic levels in it.
Will the impact of removing all the organisms in a trophic level be different for different trophic levels? Can the organisms of any trophic level be removed without causing any damage to the ecosystem?
In the following food chain, 100 J of energy is available to the lion. How much energy was available to the producer?
Plants → Deer → Lion
Construct a food chain comprising the following :
Snakes, Hawk, Rats, Plants
Explain the terms 'producer' and 'consumer'. Give two examples of producers and two of consumers.
Write down a food chain which ends with humans.
At which trophic level a person is feeding when he is eating roasted chicken.
Construct a short foodchain, ending with man.
What is a food chain?
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 |
What will happen if deer is missing in the food chain given below?
Grass → Deer → Tiger
One of the following is not a consumer. This one is :
(a) giraffe
(b) antelope
(c) algae
(d) alligator
What would happen to the number of rabbits and grass plants if the number of foxes decreased?
What would happen to the number of grass plants and foxes if the number of rabbits decreased?
Fill in the following blank with suitable word :
Plants → Antelope → ............
Most of the water surface of a lake is covered with algae. This algae is part of the food chain which also includes small fish, bird, larvae and big fish. Which of the following will obtain the maximum energy?
(a) big fish
(b) bird
(c) larvae
(d) small fish
The ten per cent law is associated with
(a) transfer of energy from various trophic levels to decomposers in a food chain
(b) transfer of ATP energy into muscular energy
(c) transfer of chemical energy from one organism to another
(d) transfer of sun's energy to the organisms called producers.
The harmful chemical which is accumulating in human beings through food chain is :
(a) benzenehexachloride
(b) dichlorodiphenyltrichloroethane
(c) chlorofluorocarbon
(d) abscisic acid
Arrange the following in a correct sequence and form a food chain
Human → Insect → Algae → Fish
In a food chain grasshopper gets energy by eating frog.
Define – Heterotrophs.
DDT was sprayed in a lake to regulate breeding of mosquitoes. How would it affect the trophic levels in the following food chain associated with a lake? Justify your answer.
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.
If a harmful chemical enters a food chain comprising peacocks, plants, rats and snakes, which of these organisms is likely to have the highest concentration of the chemical in its body? Justify your answer. Name the process involved and define it.
