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Question 18N.1.SL.TZ0.19

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Date November 2018 Marks available [Maximum mark: 1] Reference code 18N.1.SL.TZ0.19
Level SL Paper 1 Time zone TZ0
Command term Deduce Question number 19 Adapted from N/A
19.
[Maximum mark: 1]
18N.1.SL.TZ0.19

In 1789 Gilbert White, a naturalist, observed eight breeding pairs of swifts (Apus apus) in the English village of Selborne. On average, each pair of swifts produces two offspring per year. This would allow the population to rise to 1030 swifts over 200 years. A bird survey carried out in 1983 revealed only 12 breeding pairs in this village.

What could have prevented the numbers rising to 1030?

I.   The number of nesting sites remained the same.

II.  The food supply of the swifts remained constant.

III. Predatory birds in the area were exterminated.

A.  I only

B.  I and II only

C.  II and III only

D.  I, II and III

[1]

Markscheme

B

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