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Science · 2022 · 2 marks
CBSE 2022 · Region 2 · Set 3 · Q6
In the following food chain, only 2J of energy was available to the peacocks. How much energy would have been present in Grass? Justify your answer.…
In the following food chain, only 2J of energy was available to the peacocks. How much energy would have been present in Grass ? Justify your answer. GRASS → GRASS HOPPER → FROG → SNAKE → PEACOCK
OR
(a)
What is meant by garbage ? List two classes into which garbage is classified.
(b)
What do we actually mean when we say that the "enzymes are specific in their action" ?
Marking-scheme solution
$\displaystyle 20{,}000$ J
Only $\displaystyle 10$% usable energy / amount of organic matter is transferred from one trophic level to the next higher trophic level in a food chain and rest $\displaystyle 90$% is lost to the environment as heat.
OR
(a)
Waste material generated in day-to-day lives.
Biodegradable and Non-biodegradable substances.
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CBSE Class 10 Science past-paper question from the 2022 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.