CBSE 2022 · Region 5 · Set 2 · Q3 · 2 marks
(a)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?
(a)
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
OR
(b)(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
Organisms and PopulationsPopulationsUnderstandvery_short_answermedium
More from Organisms and Populations
- Study the given graphs (X) and (Y) depicting the annual variation in solar radiation on Earth from January to…2022 · asked 3×
- (i) Describe the population growth curve applicable in a population of any species in nature that has limited…2025 · asked 3×
- Read the following passage and answer the questions that follow: In nature, we rarely find isolated, single…2025 · asked 3×
- (i) Describe the Species-Area relationship as observed by Alexander von Humboldt, for a wide variety of taxa…2025 · asked 3×
- What is the carrying capacity of a species in a habitat? Explain the growth curve that takes this capacity…2026 · asked 3×
- The diagram below shows the distribution of two barnacle species, Chthamalus and Balanus on a rocky sea…2026 · asked 3×
- The graphs given below, A and B, represent population of elephants in two different National Parks (a…2022 · asked 3×
- Important attributes belonging to a population but not to an individual are: 1 (i) Birth rate and death rate…2023 · asked 3×
CBSE Class 12 Biology past-paper question from the 2022board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.