Energy in food chain

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Navin
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Energy in food chain

Post by Navin » Tue Oct 25, 2005 11:14 am

I need help for this qn:

What happens to the energy that has flowed through the food chain?

A It is lost as heat
B It is recycled
C It is stored as carbohydrate
D It is used to power metabolic processes

I know that B and C are definitely wrong.

So its between A and D.
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mith
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Post by mith » Tue Oct 25, 2005 12:50 pm

Flowing through probably means out of the system...so I'd pick A
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Post by boleto pitseyagae » Tue Oct 25, 2005 2:06 pm

BOLETO PITSEYAGAE'S ANSWER

B might be the answer because the food chain shows only trophic levels in a simple diagram so this shows the process of consumption only

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Post by boleto pitseyagae » Tue Oct 25, 2005 2:10 pm

CORRECTION TO MY ANSWER

in my answer earlier on I choosed B but I wanted to say D

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Post by Navin » Tue Oct 25, 2005 2:17 pm

What actually happens to energy used for metabolic processes?
Is it eventually lost as heat too?

Now that i think of it, maybe it does.
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Post by Terry K. » Tue Oct 25, 2005 2:22 pm

Id almost go as far to say it could be A or D, only because energy from metabolic cycles, as I learned it, can be used the power all processes within the body, and A is correct because in every process, energy is lost due to heat. If I had to choose, I'd say D was MORE correct than A only because heat is lost in every reaction, but I don't think this reaction focuses on metebolic reactions strictly!
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Post by Fried Zygote Sandwich » Tue Oct 25, 2005 5:06 pm

I'd say A.

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Post by MrMistery » Tue Oct 25, 2005 6:41 pm

Both A and D are correct, but i would say D. It seems "more correct". Let us know what it was...
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Post by Navin » Wed Oct 26, 2005 5:03 am

Ill let you know as soon as my bio teacher posts me a reply. that'll be soon.
Last edited by Navin on Wed Oct 26, 2005 8:14 am, edited 1 time in total.
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Post by DJ » Wed Oct 26, 2005 6:53 am

This is weird because it doesn't specify whether you are to say what happens to the energy after it has flowed through or what happens to the energy as it flows through the food chain. If it's as then it could be B,C, or D. If it is after then it could only be A.

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Post by Navin » Wed Oct 26, 2005 8:12 am

Yes DJ, you were right.
My Bio teacher said that the question was unclear and should be modified to:
What eventually happens to the energy that has flowed through the food chain?

In this case the answer would be A.

Im quite shocked actually to see that Cambridge can set such vague questions for their O levels. Then again, nobody is perfect.

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Post by baikuza » Wed Oct 26, 2005 9:36 am

acctually i have different answer about this.

my answer is A

it's true if we said that the energy goes out so that the cell can use it. but at other hand it makes the cell get heat to do metabolic processes.
at aerobic respiration only almost 40% for can be used by the cell.the other out as heat

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