I- improved packages of high-yielding seed varieties
II- fertilizers, pesticides and irrigation
III- improved transportation
IV better extension service
A. I and III only
B. II and III only
C. I, II and III only
D. I, II, III and IV

A. high-yielding varieties (HYVs) of grains
B. Polio and small-pox vaccinations.
C. the campaign against river blindness
D. the drilling of oil in the Arctic

A. Boys as young as 8 years old tend or herd animals, weed pick and sell produce
B. Children place more economic demands on a peasant family than an urban family
C. Major financial security is usually provided by sons
D. The cost of education entertainment and travel is low

A. The total number of children born in a country in given year a divided by labor force
B. The number of children born to the average woman during her reproductive years.
C. The number of births in a country divided by total population in a given year.
D. The number of woman age 15-45 in a country divided by total population

A. the agribusiness revolution
B. farming system theory
C. the Green Revolution
D. Agri-R&D

A. population self-sufficiency and constant economic growth
B. low fertility and mortality
C. a laissez-faire population policy
D. a constant returns to scale production function

A. The World Bank
B. Thomas Robert Malthus
C. Julian Simon
D. Abraham Lincoin

A. increasing at an increasing rate
B. decreasing
C. zero
D. 100%

A. labor force participation rate
B. per capita population ratio
C. dependency ratio
D. None of these

A. reduce yield losses by pests while minimizing the negative effects of pest control
B. have year-round plantings of a single crop
C. undertake monoculture pest planning
D. encompass biological control through fertilizers