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Science · 2024 · 3 marks
CBSE 2024 · Region 1 · Set 1 · Q33
(A) Plants → Deer → Lion In the given food chain, what will be the impact of removing all the organisms of second trophic level on the first and…
Plants → Deer → Lion In the given food chain, what will be the impact of removing all the organisms of second trophic level on the first and third trophic level? Will the impact be the same for the organisms of the third trophic level in the above food chain if they were present in a food web? Justify.
A gas 'X' which is a deadly poison is found at the higher levels of atmosphere and performs an essential function. Name the gas and write the function performed by this gas in the atmosphere. Which chemical is linked to the decrease in the level of this gas? What measures have been taken by an international organization to check the depletion of the layer containing this gas?
Marking-scheme solution
Number of plants/organisms of first trophic level will increase.
Number of lions/ organisms of third trophic level will decrease.
No
As the organisms of that level will find alternative foods and will not starve to death / food web is more stable where other animals as prey may be available.
Gas 'X' is Ozone
Ozone shields the surface of the earth from ultra-violet (UV) radiations from the sun.
CFCs (Chlorofluorocarbons)
Succeeded in forging an agreement to freeze CFC production at $\displaystyle 1986$ levels / Manufacturing of CFC free refrigerators
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