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Biology · 2022 · 2 marks
CBSE 2022 · Region 5 · Set 2 · Q3
(a) (i) Write the observations made at the end of Connell's field experiment on barnacles on the rocky sea coasts of Scotland. (ii) Name any two…
(i)
Write the observations made at the end of Connell's field experiment on barnacles on the rocky sea coasts of Scotland.
(ii)
Name any two categories of organisms that in general are adversely affected by competition.
The graphs (X) and (Y) given below depict the diurnal variations in the solar radiations in the month of June (Summer) and in December (Winters) :
(i)
Which of the two graphs depicts tropical region and temperate regions respectively?
(ii)
Which of the two regions (X) or (Y) will show high biological diversity and why?
Marking-scheme solution
(a) (i) The larger and competitively superior barnacle (Balanus) dominates the intertidal area , and excludes the smaller barnacle (Chathamalus) from the zone
(ii) Herbivores, plants
(ii) Tropical region has high biological diversity due to less seasonal fluctuations / predictable climate / relatively more constant environments / constant environment promotes niche specialisation / more solar energy available / long evolutionary time for species diversification
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CBSE Class 12 Biology past-paper question from the 2022 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.