EHST 2110 Final Exam Part 1 Questions
with 100% Correct Answers
What is an ecosystem? - Answer- A community of living organisms interacting with each
other and their environment.
What does population dynamics study? - Answer- How and why the number of
individuals in a group changes over time.
What is biotic potential? - Answer- The maximum achievable growth rate of a population
with unlimited resources.
What is environmental resistance? - Answer- Factors that prevent a population from
growing without limits, keeping it balanced with its environment.
What historical event did John Snow investigate related to environmental health? -
Answer- The cholera outbreak in London, demonstrating sewage-contaminated water
as the cause.
What did Walter Reed discover about yellow fever? - Answer- It is a mosquito-borne
disease affecting US troops in the Caribbean.
What was the significance of Rachel Carson's 'Silent Spring'? - Answer- It highlighted
the dangers of pesticides and their environmental impact.
What health effects were associated with Love Canal in the 1970s? - Answer- Health
effects related to toxic waste sites.
What is a limiting factor in population growth? - Answer- Any factor that prevents an
organism or population from growing without limit, keeping it in balance with its
environment.
What are the two main forms of population growth curves? - Answer- S-curves
(sigmoidal) and J-curves (exponential).
What is integrated pest management (IPM)? - Answer- A strategy that combines natural
controls with prudent use of pesticides
,What role do natural enemies play in pest control? - Answer- Using insect predators to
control pest populations
What are microbial pesticides? - Answer- Pesticides made from bacteria, fungi, viruses,
or protozoa
What is the purpose of insect growth regulators (IGRs)? - Answer- Chemicals that
disrupt the life cycle of pests
What does host plant resistance involve? - Answer- Using crop plants that are
genetically resistant to pests
What are the three main determinants of health? - Answer- Hereditary or biological
factors, lifestyle, and medical care.
Which determinant of health has the highest impact? - Answer- The environment,
affecting health status as high as 80%.
What are the four main categories of causative agents of disease related to the
environment? - Answer- Biological agents, chemical agents, physical agents, and too
little or too much of something.
What are examples of biological agents? - Answer- Viruses, bacteria, fungi, protozoa,
and metazoa.
What are chemical agents? - Answer- Substances that cause disease due to their ability
to engage in chemical reactions with body molecules.
What are physical agents that can damage health? - Answer- Ionizing radiation, noise,
and ultraviolet (UV) radiation.
What can result from a lack of certain life-supporting materials? - Answer- Diseases
such as rickets (Vitamin D deficiency) and scurvy (Vitamin C deficiency).
What are the portals of entry for diseases? - Answer- Respiratory tract, digestive tract,
skin, reproductive organs, mucous membranes, and ears.
Why is environmental health important? - Answer- It maintains a healthy environment,
central to increasing quality of life and reducing disease burden.
What percentage of deaths can be attributed to environmental factors? - Answer- Nearly
25%.
What are some examples of environmental factors affecting health? - Answer- Exposure
to hazardous substances, natural disasters, physical hazards, and nutritional
deficiencies.
, Who is at greatest risk from poor environmental quality? - Answer- Children, the elderly,
and those with pre-existing health conditions.
What health issues are linked to poor outdoor air quality? - Answer- Premature death,
cancer, and long-term respiratory and cardiovascular damage.
What can water contamination cause? - Answer- Mild to severe illness due to infectious
agents or chemicals.
What are neglected tropical diseases (NTDs)? - Answer- Infectious diseases that
primarily affect the poorest communities, leading to blindness and disability.
What is trachoma? - Answer- A contagious bacterial infection of the eye causing
inflammation on the inner surface of the eyelids.
What is onchocerciasis? - Answer- A parasitic disease caused by the worm Onchocerca
volvulus, leading to severe skin and eye problems.
What is filariasis? - Answer- A parasitic infection caused by thread-like worms that live
in the lymphatic system.
What is the definition of a population in ecological terms? - Answer- Individuals of the
same species living together within a given area.
What characterizes the lag phase in population growth? - Answer- Slow growth initially.
What occurs during the exponential growth phase? - Answer- Dramatic increase in
population size, often exceeding carrying capacity.
What is carrying capacity? - Answer- The maximum population size that an environment
can sustain, where birth and death rates are balanced.
Which biologist studied bacteria and created the S-curve model? - Answer- A Russian
biologist.
What is a characteristic of J-curves in population growth? - Answer- They frequently
result in population crashes after rapid growth.
What is the phenomenon of doubling time? - Answer- The amount of time it takes for a
population to double in size.
Who was Thomas Malthus? - Answer- A British clergyman and economist who warned
about the dangers of unchecked population growth.
What is the Dismal Theorem proposed by Malthus? - Answer- The idea that population
will always exceed food supply, leading to war, famine, and disease.
with 100% Correct Answers
What is an ecosystem? - Answer- A community of living organisms interacting with each
other and their environment.
What does population dynamics study? - Answer- How and why the number of
individuals in a group changes over time.
What is biotic potential? - Answer- The maximum achievable growth rate of a population
with unlimited resources.
What is environmental resistance? - Answer- Factors that prevent a population from
growing without limits, keeping it balanced with its environment.
What historical event did John Snow investigate related to environmental health? -
Answer- The cholera outbreak in London, demonstrating sewage-contaminated water
as the cause.
What did Walter Reed discover about yellow fever? - Answer- It is a mosquito-borne
disease affecting US troops in the Caribbean.
What was the significance of Rachel Carson's 'Silent Spring'? - Answer- It highlighted
the dangers of pesticides and their environmental impact.
What health effects were associated with Love Canal in the 1970s? - Answer- Health
effects related to toxic waste sites.
What is a limiting factor in population growth? - Answer- Any factor that prevents an
organism or population from growing without limit, keeping it in balance with its
environment.
What are the two main forms of population growth curves? - Answer- S-curves
(sigmoidal) and J-curves (exponential).
What is integrated pest management (IPM)? - Answer- A strategy that combines natural
controls with prudent use of pesticides
,What role do natural enemies play in pest control? - Answer- Using insect predators to
control pest populations
What are microbial pesticides? - Answer- Pesticides made from bacteria, fungi, viruses,
or protozoa
What is the purpose of insect growth regulators (IGRs)? - Answer- Chemicals that
disrupt the life cycle of pests
What does host plant resistance involve? - Answer- Using crop plants that are
genetically resistant to pests
What are the three main determinants of health? - Answer- Hereditary or biological
factors, lifestyle, and medical care.
Which determinant of health has the highest impact? - Answer- The environment,
affecting health status as high as 80%.
What are the four main categories of causative agents of disease related to the
environment? - Answer- Biological agents, chemical agents, physical agents, and too
little or too much of something.
What are examples of biological agents? - Answer- Viruses, bacteria, fungi, protozoa,
and metazoa.
What are chemical agents? - Answer- Substances that cause disease due to their ability
to engage in chemical reactions with body molecules.
What are physical agents that can damage health? - Answer- Ionizing radiation, noise,
and ultraviolet (UV) radiation.
What can result from a lack of certain life-supporting materials? - Answer- Diseases
such as rickets (Vitamin D deficiency) and scurvy (Vitamin C deficiency).
What are the portals of entry for diseases? - Answer- Respiratory tract, digestive tract,
skin, reproductive organs, mucous membranes, and ears.
Why is environmental health important? - Answer- It maintains a healthy environment,
central to increasing quality of life and reducing disease burden.
What percentage of deaths can be attributed to environmental factors? - Answer- Nearly
25%.
What are some examples of environmental factors affecting health? - Answer- Exposure
to hazardous substances, natural disasters, physical hazards, and nutritional
deficiencies.
, Who is at greatest risk from poor environmental quality? - Answer- Children, the elderly,
and those with pre-existing health conditions.
What health issues are linked to poor outdoor air quality? - Answer- Premature death,
cancer, and long-term respiratory and cardiovascular damage.
What can water contamination cause? - Answer- Mild to severe illness due to infectious
agents or chemicals.
What are neglected tropical diseases (NTDs)? - Answer- Infectious diseases that
primarily affect the poorest communities, leading to blindness and disability.
What is trachoma? - Answer- A contagious bacterial infection of the eye causing
inflammation on the inner surface of the eyelids.
What is onchocerciasis? - Answer- A parasitic disease caused by the worm Onchocerca
volvulus, leading to severe skin and eye problems.
What is filariasis? - Answer- A parasitic infection caused by thread-like worms that live
in the lymphatic system.
What is the definition of a population in ecological terms? - Answer- Individuals of the
same species living together within a given area.
What characterizes the lag phase in population growth? - Answer- Slow growth initially.
What occurs during the exponential growth phase? - Answer- Dramatic increase in
population size, often exceeding carrying capacity.
What is carrying capacity? - Answer- The maximum population size that an environment
can sustain, where birth and death rates are balanced.
Which biologist studied bacteria and created the S-curve model? - Answer- A Russian
biologist.
What is a characteristic of J-curves in population growth? - Answer- They frequently
result in population crashes after rapid growth.
What is the phenomenon of doubling time? - Answer- The amount of time it takes for a
population to double in size.
Who was Thomas Malthus? - Answer- A British clergyman and economist who warned
about the dangers of unchecked population growth.
What is the Dismal Theorem proposed by Malthus? - Answer- The idea that population
will always exceed food supply, leading to war, famine, and disease.
