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UPSC CSE CSAT 2018 · Question 63 · Data interpretation & sufficiency

Directions for the following 2 (two) items: Consider the following graph in which the birthrate…

CSAT 2018 · Q63

Data interpretation & sufficiency Hard

Directions for the following 2 (two) items: Consider the following graph in which the birthrate and death rate of a country are given, and answer the two items that follow.

Line graph, 1970–2010, of birth and death rates per thousand: the birthrate (solid) falls from 30 to about 22.5 in 1990 and 19 in 2000, then levels off at about 18; the death rate (dashed) falls from 25 to about 14 in 1990 and about 6.5 by 2000, then stays near 6.5–7.
From UPSC's question paper.

Looking at the graph, it can be inferred that from 1990 to 2010

Answer & explanation

Answer: (d) population growth rate shows no trend

Why not the tempting option · UPSC's key is (d). The gap between the two curves, which is the growth rate, widens from about 8.5 per thousand in 1990 to about 11.5 in 2000, then flattens and eases slightly to about 11 by 2010, so there is no single direction across 1990–2010. 'Has increased' is tempting because 2010 sits higher than 1990, but the rise ends at 2000 and the gap drifts down after that. In the exam, read a trend over a stated period as one consistent direction across the whole period, as UPSC does; its key to the next item likewise treats the growth rate as having stabilised after 2005.

The population growth rate is the gap between the birthrate and the death rate. From 1990 the gap widens, from about 8.5 to about 11.5 per thousand by 2000, and then flattens and eases slightly to about 11 by 2010. A rise followed by a plateau is not a single direction, so over 1990–2010 the growth rate shows no trend: (d).

  1. Natural growth rate = birthrate − death rate: the vertical gap between the two curves.
  2. 1990: about 22.5 − 14 = 8.5 per thousand. 1995: about 20 − 9.5 = 10.5.
  3. 2000: about 18.5 − 7 = 11.5. 2005: about 18 − 6.5 = 11.5. 2010: about 18 − 7 = 11.
  4. So the gap rises through the 1990s, then stops rising and dips a little through the 2000s.
  5. 'Increased' needs the rise to run through the whole period, but it ends at 2000; 'decreased' and 'stable' fail for the 1990s. A rise that then levels off is no single trend: (d).

Remember · Population growth rate = birth rate − death rate: read the gap between the curves, not the curves themselves. A rise that then levels off is 'no trend' over the whole period, not 'increased'.

Question and answer: UPSC's official GS Paper II (2018, Series A) — paper ↗ · answer key ↗. Explanation: Minimalist IAS, checked 1 Oct 2026 (how we verify). ·

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