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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.
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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 of food to 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
Give diagrammatic representation of pyramid of numbers.
“It is often said that the pyramid of energy is always upright. On the other hand, the pyramid of biomass can be both upright and inverted.” Explain with the help if examples and sketches.
Why the pyramid of energy is always upright? Explain.
In a food chain, the herbivores are represented by
(A) producers
(B) primary consumers
(C) secondary consumers
(D) decomposers
Explain energy pyramid
Which organisms constitute the last trophic level?
“The pyramid of biomass is not always upright.” Explain the statement.
'The pyramid of energy is always upright.' Explain
Explain with the help of labelled diagrams, the difference between an upright pyramid of biomass and an inverted pyramid of biomass.
Secondary consumers are __________.
Give an example of an ecosystem that shows an inverted pyramid of biomass.
Distinguish between the upright and inverted pyramid of biomass.
In a tree ecosystem the pyramid of numbers is:
Which one of the following statements for pyramid of energy is incorrect, whereas the remaining three are correct?
Pyramid of biomass in terrestrial ecosystem shows sharp decline in
Which of the following statements is not correct?
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.
Organisms at a higher trophic level have less energy available. Comment.
The number of trophic levels in an ecosystem are limited. Comment.
What are the shortcomings of ecological pyramids in the study of ecosystems?
(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.
(a) Draw a pyramid of numbers where a large number of insects are feeding on the leaves of a tree. What is the shape of this pyramid?
(b) Will the pyramid of energy be also of the same shape in this situation? Give a reason for your response.
The biomass of a standing crop of phytoplankton is 4 kg/m2, which supports a large standing crop of zooplankton having a biomass of 11 kg/m2. This is consumed by small fishes having a biomass of 25 kg/m2, which are then consumed by large fishes with a biomass of 37 kg/m2.
Draw an ecological pyramid indicating the biomass at each stage and also name the trophic levels. Mention whether it is an upright or inverted pyramid.
Give a scientific reason:
The pyramid of energy is always upright.
Describe pyramid of energy with the help of diagram.
| 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.
