Question

25. In reference to ranges of tolerance for limiting factors, which of the following population groups is most sensitive to adverse environmental conditions?

a. Males

b. Babies and young children

c. The elderly

d. Females

26. Who was Thomas Malthus?

                a. Population biologist who formulated the S-curve from his experiments on paramecia

                b. Chairman of the Presidential Commission on World Hunger who warned that international tensions due lo food shortages could led to armed conflict

c. British economist who warned that population growth will always outstrip food supply

              d. Research chemist whose work led to the development of oral contraceptives

              e. The 'Father of the Green Revolution’

27. What is considered to represent the single most frequent cause of lead poisoning among American children?

               a. eating vegetables grown in lead-contaminated soil

              b. eating lead-contaminated seafood

              c. swallowing paint chips or paint dust

              d. drinking water from lead-containing plumbing system

              e. inha1ation of emissions from city incinerators

28.    The sharp increase in skin cancer rates during the past few decades in the U.S. has largely been attributed to excess exposure to:

a. ultraviolet light

b. infrared waves

c. visible light

d. microwaves

e. alpha radiation

Answer 1

Ans 25 c) elderly. This is because they have fewer immune cells with age and also recover very slowly.

Ans 26 c.) British economist who warned that population growth will always outstrip food supply.

The Malthusian Theory of Population is a theory of exponential population growth and arithmetic food supply growth. Thomas Robert Malthus, an English cleric, and scholar published this theory in his 1798 writings, An Essay on the Principle of Population.

Ans 27  c). swallowing paint chips or paint dust

Factors that may increase your risk of lead poisoning include: Age. Infants andyoung children are more likely to be exposed to lead than are older children. They might chew paint that flakes off walls and woodwork, and their hands can be contaminated with lead dust.

Ans 28 a). ultraviolet light