KHAN ACADEMY- SOCIAL SCIENCEAdapted from Colin Butler, "Human Carrying Capacity and Human Health." © 2004 by Public Library of Science. The passage refers to carrying capacity, or the maximum population size of a species that an environment can support.

The author implies that Reverend Thomas Malthus was influential because he

(B) Developed a framework for balancing population growth and resources.

According to the graph, if the High Fertility rate is maintained

(B) The world's population will roughly double between 2010 and 2100

The primary purpose of the passage is to

(C) Introduce the idea that global population growth has continued to be a serious concern despite advances in agriculture and contraception.

How does the graph relate to the passage?

(C) It provides support for the idea that there will be a drastic increase in global population if fertility rates remain constant.

In line 28("sympathetic to"), "sympathetic to" most nearly means

(C) Supportive of.

The graph indicates that the population projections for Constant Fertility and High Fertility rates begin to diverge significantly in which time span?

(D) 2040-2060This is the best choice. The Constant and High fertility projections begin to diverge significantly between 2040 and 2060.

It can reasonably be inferred that Borlaug viewed the dramatic increase in cereal production as

(D) A partial solution to global overpopulation that will fail if other factors are not addressed

Which choice provides the best evidence for the answer to the previous question?

(D) Lines 47-52 ("In . . . rates")("In 1970, the father of the Green Revolution, the agricultural scientist Norman Borlaug, was awarded the Nobel Peace Prize. In his Nobel lecture, Borlaug warned that the success of the Green Revolution would buy a breathing space for humankind of three decades, unless equivalent action was taken to reduce fertility rates"))

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Which choice provides the best evidence for the answer to the previous question?

(A) Lines 3-8 ("In . . . marriage")("In 1798 the Reverend Thomas Malthus put forward the hypothesis that population growth would exceed the growth of resources, leading to the periodic reduction of human numbers by either "positive checks", such as disease, famine, and war, or "preventive checks", by which (in the absence of contraception) Malthus meant restrictions on marriage.")

The author's discussion of the "Green Revolution" in paragraph 4 (line 32(""Green Revolution"")) primarily serves to

(A) Provide a positive contrast to the dire predictions made elsewhere in the passage.

In the second paragraph (lines 11-20("Malthus's worst fears were not borne out through the century following his death in 1834—food production largely kept pace with the slowly growing global population. However, soon after 1934, the global population began to rise steeply as antibiotics, vaccines, and technology increased life expectancy. By the 1960s, concerns of a mismatch between global population and global food supply peaked—expressed in books such as Paul Ehrlich's 1968 The Population Bomb. This book predicted a future scarred by increasing famine, epidemic, and war—the three main Malthusian positive checks.")), the words "fears," "concerns" and "scarred" primarily serve to

(B) Emphasize the anxiety surrounding predictions regarding overpopulation