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Science · 2023 · 3 marks
CBSE 2023 · Region 1 · Set 1 · Q33
(a) (i) Why does a kitchen garden called an artificial ecosystem while a forest is considered to be a natural ecosystem? (ii) While designing an…
(i)
Why does a kitchen garden called an artificial ecosystem while a forest is considered to be a natural ecosystem ?
(ii)
While designing an artificial ecosystem at home, write any two things to be kept in mind to convert it into a self-sustaining system. Give reason to justify your answer.
(i)
Construct a food chain of four trophic levels comprising the following : Hawk, snake, plants, rat.
(ii)
$\displaystyle 20{,}000$ J of energy was transferred by the producers to the organism of second trophic level. Calculate the amount of energy that will be transferred by organisms of the third trophic level to the organisms of the fourth trophic level.
Marking-scheme solution
(a)(i)
Kitchen Garden → A man ma Forest → Ecosystem maintai
(ii)
In a jar containing water we c and add a few aquatic plants sustaining system.
Justification -
Oxygen is replenished cont
Aquatic plants serve as foo
OR
(b)(i)
Plants ⟶ Rats ⟶ S
(ii)
Energy available at second tro Energy transferred from seco Energy transferred from third
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