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Biology · 2022 · 2 marks
CBSE 2022 · Region 4 · Set 1 · Q6
(a) The graphs given below, A and B, represent population of elephants in two different National Parks (a hypothetical situation) at different times.…
The graphs given below, A and B, represent population of elephants in two different National Parks (a hypothetical situation) at different times.
Study the graphs and comment upon the pattern of growth observed. Mention the possible reason for such patterns seen in nature.
As per a recent newspaper report, a particular country showed declining population growth rate. According to you, what could be the two most possible reasons for this decline and why ?
Marking-scheme solution
(a) • Graph A depicts exponential growth/ geometric growth, due to unlimited resources and absence of checks/ environmental resistances
Graph B shows extinction, due to lack of resources and environmental resistances.
Possible Reasons for decline in human population : Increased Emigration, Increased Mortality, Decreased Birth Rate / Natality, Use of contraceptives, spread of epidemic
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Possible reasons for decline in plants, animals / other organisms' population: Deforestation, Decreased food availability, Predation pressure, adverse weather, competition
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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.