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प्रश्न
Give two differences between food chain and food web.
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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
The first trophic level in a food chain is always a green plant. Why ?
Why are plants called producers?
Which of the following belong to the same trophic level?
Tree ; Frog ; Snake ; Grass ; Lizard
What are the various steps of food chain called?
Fill in the following blank with suitable word :
Decomposer organisms are..........in their action.
Write down a food chain in the sea.
Construct a long food chain.
The sea water contains water beetles, tadpole, fish and weeds.
Write a food chain comprising all the given organisms.
The following is a food chain that ends with human :
plants → bee → human
How do bees provide food for humans?
A food chain occurring in the sea which provides food for many people can be written as :
phytoplankton → zooplankton → X → Y
Which organism in the above food chain is a (1) primary consumer, and (2) tertiary consumer?
In a food chain consisting of grass, frog, bird and insects, where will the concentration of the harmful chemicals be maximum?
'If we excessively use pesticides to protect the crops from diseases, then it may cause long-term damage to mankind'. Justify this statement.
Explain why, the flow of energy in the ecosystem is said to be unidirectional.
What provides the energy which then flows through a food chain?
(a) glucose
(b) oxygen
(c) respiration
(d) sunlight
Which of the following gets the minimum energy through the food chain in an ecosystem?
(a) carnivore
(b) large carnivore
(c) producer
(d) herbivore
A food chain comprises of cat, seed-eating bird, plants, and dog. The organism which will have the maximum concentration of harmful pesticides coming through the food chain is most likely to be :
(a) cat
(b) plants
(c) dog
(d) seed-eating bird
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
Green plants utilize ______ percent of sun’s energy to prepare their food by the process of photosynthesis.
Food chains are very important for the survival of most species.
If 10,000 J solar energy falls on green plants in a terrestrial ecosystem, what percentage of solar energy will be converted into food energy?
