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Question
Study the image and identify the amount of energy available for eagle if the amount of energy available for grasshopper in the given food chain is 2000 KJ?
Study the image and identify the amount of energy available for eagle if the amount of energy available for grasshopper in the given food chain is 2000 KJ?
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Solution
The correct option is C 2 KJ
A food chain is a series of organisms in which transfer of energy takes place in the form of food from one organism to another organism.
Producers are present at the bottom of the grazing food chain synthesise their own food utilising the energy radiating from the sun (ultimate source of energy). Consumers in the food chain are dependent on plants directly or indirectly for their food.
Herbivores known as primary consumers are present at the second trophic level and carnivores eat herbivores in the food chain, known as secondary consumers occupying the third trophic level.
According to 10% law of energy transfer, in a food chain the energy is passed from one trophic level to another, during this transfer of energy only 10 percent is passed on to the next trophic level.
Some of the energy is lost during living processes (like excretion, respiration, etc.) from an organism. A part of the energy is lost to the environment when it is transferred from one trophic level to another. This is because ecosystems follow the second law of thermodynamics. It states that whenever energy is converted from one form to another, there is a tendency towards disorder (entropy) in the system or some of the energy is lost to the environment.
In the given food chain, grasshoppers occupy the 2nd trophic level. Then,
Energy transferred to frog = 10/100 x 2000 = 200 KJ. So option a is incorrect.
Energy transferred to python = 10/100 x 200 = 20 KJ. So option b is incorrect.
Energy transferred to Eagle = 10/100 x 20 = 2 KJ. Hence option c is correct.
So, if the amount of energy available for grasshoppers is 2000 KJ. This implies, 2000 KJ is 10% of energy available from grass. So, energy of grass (Y) can be calculated as
10% of Y = 2000
10/100 Y = 2000
Y = 2000 x 100/10
Y = 20,000 KJ
No, more organisms are present in the food chain after eagle so 0.2 KJ can not be the answer. So option d is incorrect.
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A food chain is a series of organisms in which transfer of energy takes place in the form of food from one organism to another organism.
Producers are present at the bottom of the grazing food chain synthesise their own food utilising the energy radiating from the sun (ultimate source of energy). Consumers in the food chain are dependent on plants directly or indirectly for their food.
Herbivores known as primary consumers are present at the second trophic level and carnivores eat herbivores in the food chain, known as secondary consumers occupying the third trophic level.
According to 10% law of energy transfer, in a food chain the energy is passed from one trophic level to another, during this transfer of energy only 10 percent is passed on to the next trophic level.
Some of the energy is lost during living processes (like excretion, respiration, etc.) from an organism. A part of the energy is lost to the environment when it is transferred from one trophic level to another. This is because ecosystems follow the second law of thermodynamics. It states that whenever energy is converted from one form to another, there is a tendency towards disorder (entropy) in the system or some of the energy is lost to the environment.
In the given food chain, grasshoppers occupy the 2nd trophic level. Then,
Energy transferred to frog = 10/100 x 2000 = 200 KJ. So option a is incorrect.
Energy transferred to python = 10/100 x 200 = 20 KJ. So option b is incorrect.
Energy transferred to Eagle = 10/100 x 20 = 2 KJ. Hence option c is correct.
So, if the amount of energy available for grasshoppers is 2000 KJ. This implies, 2000 KJ is 10% of energy available from grass. So, energy of grass (Y) can be calculated as
10% of Y = 2000
10/100 Y = 2000
Y = 2000 x 100/10
Y = 20,000 KJ
No, more organisms are present in the food chain after eagle so 0.2 KJ can not be the answer. So option d is incorrect.
<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}-->
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