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प्रश्न
Distinguish between a food chain and a food web.
Differentiate between a food chain and a food web.
Give two differences between food chain and food web.
What is difference between food chain and food web?
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उत्तर
| Sr. No. | Food chain | Food web |
| i. | The food chain is a definite sequence of interactions between producers, consumers, and decomposers (saprophytes). | The food web is a network of food chains that are interconnected at various levels, forming an intricate web instead of a linear chain. |
| ii. | If any of the intermediate organisms are removed from the chain, it affects the whole food chain. | In the food web, there is more than one alternative food source for most of the organisms; hence, the removal of an organism does not affect the food web directly. |
| iii. | Members of higher trophic levels feed on a single species of organism. | A single organism can consume many sorts of organisms. |
| iv. | In the food chain, energy flow may be easily quantified. | In a food web, calculating energy flow is complicated. |
| v. | Members of the same trophic level compete with one another. | Members of the same as well as distinct trophic levels compete. |
Notes
Students should refer to the answer according to their questions.
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संबंधित प्रश्न
In an ecosystem dominated by trees, the pyramid (of numbers) is ______ type.
Distinguish between upright and inverted pyramids.
Describe with examples of pyramids of number and biomass.
Which organisms constitute the last trophic level?
“The pyramid of biomass is not always upright.” Explain the statement.
With reference to the levels of an organisation, differentiate between living organisms and non-living objects.
Write any two limitations of ecological pyramids.
Distinguish between the upright and inverted pyramid of biomass.
Which ecosystem has the maximum biomass?
In a tree ecosystem the pyramid of numbers is:
Which of the following organism form the decomposers?
In a pyramid of biomass, if the total dry weight (kgm-2) of primary produces is about 809, it well increases at tertiary consumer level up to ______.
Pyramid of biomass in terrestrial ecosystem shows sharp decline in
Pyramid of numbers is ______.
What does the base tier of the ecological pyramid represent?
Name any two organisms which can occupy more than one trophic level in an ecosystem.
The number of trophic levels in an ecosystem are limited. Comment.
What are the shortcomings of ecological pyramids in the study of ecosystems?
What are the three types of ecological pyramids? What information is conveyed by each pyramid with regard to structure, function and energy in the ecosystem?
(a) Given below is a pyramid of biomass in an ecosystem where each bar represents the standing crop available in the trophic level. With the help of an example explain the conditions where this kind of pyramid is possible in nature.
(b) Will the pyramid of energy be also of the same shape in this situation? Give a reason for your response.
Draw a diagram of pyramid of energy.
Give a scientific reason:
The pyramid of energy is always upright.
| In a forest ecosystem, a large population of insect feeds upon a banyan tree. Several small birds feed upon these insects. The small birds are fed upon by big-sized birds. |
- With respect to this ecosystem, draw a pyramid for each biomass and a pyramid of number.
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If 20,000 Kcal energy is available at the level of insects, calculate the amount of energy available at the level of big-sized birds.
Who developed the concept of ecological pyramids, and in which year?
What does the apex of each ecological pyramid represent?
Which combination can produce an inverted pyramid of numbers?
What does a pyramid of biomass represent?
Which ecosystem shows an inverted biomass pyramid?
What does a pyramid of energy represent?
Which food chains have more available energy?
Which statement expresses the general pattern of energy across trophic levels?
Which statement is a limitation of ecological pyramids?
