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Science · 2024 · 3 marks
CBSE 2024 · Region 4 · Set 1 · Q33
Study the picture given below showing three food chains (a), (b) and (c) and answer the following questions :
(a)(b)(c)(i)Name the type of ecosystems that exist in food chains (b) and (c).(ii)The first trophic level in all food chains are producers. Why ? What percentage of solar energy do these producers capture for their use ?(iii)Why are the arrows shown in the diagram in one direction only and not vice versa ? Justify.
Study the picture given below showing three food chains (a), (b) and (c) and answer the following questions :
(a)
(b)
(c)(i)
Name the type of ecosystems that exist in food chains (b) and (c).
(ii)
The first trophic level in all food chains are producers. Why ? What percentage of solar energy do these producers capture for their use ?
(iii)
Why are the arrows shown in the diagram in one direction only and not vice versa ? Justify.
Marking-scheme solution
(i) •Terrestrial /Grassland / cropland
-Aquatic /Pond
(ii) First trophic level are always producers or autotrophs as they can capture the solar energy and convert it into chemical energy.
$\displaystyle 1$% energy is captured.
(iii) Because energy flows in one direction only. Justification: when energy passes from one trophic level to other it cannot revert back.
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CBSE Class 10 Science past-paper question from the 2024board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.