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महाराष्ट्र राज्य शिक्षण मंडळएचएससी विज्ञान (सामान्य) इयत्ता १२ वी

Distinguish between a food chain and a food web.

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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?

फरक स्पष्ट करा
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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.
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Notes

Students should refer to the answer according to their questions.

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पाठ 14: Ecosystems and Energy Flow - Exercises [पृष्ठ ३२०]

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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.


In an ecosystem dominated by trees, the pyramid (of numbers) is ______ type.


Describe with examples of pyramids of number and biomass.


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.


With reference to the levels of an organisation, differentiate between living organisms and non-living objects.


Answer the following question.
What is an ecological pyramid? Compare the pyramids of energy, biomass, and numbers.


Write any two limitations of ecological pyramids.


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.


Define ecological pyramids.


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 ______.


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


In an aquatic ecosystem, a mollusc typically belongs to-


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.


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.


A graphic representation of the biomass relationship between the producer and consumer in an ecosystem is called ______.


Give a scientific reason:

The pyramid of energy is always upright.


Describe pyramid of energy with the help of diagram.


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