WorksheetsL.1
Total questions: 15
Worksheet time: 15mins
Which will occur if humans continue to overload water systems with excess nutrients?
chemosynthesis
eutrophication
nitrification
photosynthesis
Which aspect of fertilizer pollution would have the greatest negative impact on an aquatic ecosystem?
Nitrates poison the water that fish breathe through their gills.
Microorganisms in the water absorb all the oxygen, suffocating animals.
Aquatic animals increase, adding producers to the food chain and feeding fish.
Algal blooms deplete the oxygen and block the sunlight from penetrating a body of water.
Why does fertilizer pollution stimulate the growth of algae in a pond?
Algae are producers and use the fertilizer’s nutrients to rapidly multiply.
Algae are producers and use the fertilizer’s nutrients during decomposition.
Algae are parasites and absorb energy from the fertilizers in order to grow.
Algae are herbivores that feed off of the plants, which grow due to the excess fertilizers.
A recreational lake experiences eutrophication because of excess nutrients. Based on this information, how would the recreational lake most likely appear?
clear and blue
oily and greasy
murky and full of algae
orange and rust-colored
Which best explains the importance of pH in determining the health of a water system?
Most organisms living in water are able to adapt to changing water pH.
Variations in the pH of water can indicate the presence of toxic substances.
A low pH in ground water encourages the growth of photosynthetic organisms.
Variations in the pH of water can affect the ability of water to absorb atmospheric gases.
Which process would most likely increase the dissolved oxygen level in a freshwater lake?
algal bloom
lake turnover
photosynthesis
respiration
Which factors can have the greatest effect on the health of a river system?
type of soil and salinity
nitrate levels and turbidity
human consumption and pH
natural disasters and tidal change
Which best determines the health of a lake used as a source of freshwater?
its depth and width
its temperature and pH
its location and depth
its temperature and depth
If a body of water has high turbidity levels, what can most likely be concluded?
It has a low pH
It is unsafe to drink
It is too hot to drink
It contains lots of chemicals
Which does an increase in eutrophication indicate to scientists studying a body of water?
an increase in fertilizer runoff
a decrease in pollutants from farm runoff
an increase in the health of the body of water
an increase in oxygen levels in the body of water
Which groundwater contaminant contained in fertilizers and pesticides comes from farms?
bacteria
mercury
nitrates
sodium
Which would most affect the health of fish in a local pond?
The daily release of hot water into the pond from a local factory.
A storm temporarily stirring up water and sediments in the pond.
The occasional erosion of sediments into the pond from a nearby field.
A slight increase in the number of people who fish in the pond for food.
What is the primary process by which plants convert light energy into chemical energy?
Photosynthesis
Respiration
Transpiration
Fermentation
Which of the following is a greenhouse gas that contributes to global warming?
Oxygen
Nitrogen
Carbon Dioxide
Helium
What is the chemical formula for water?
H2O
CO2
O2
CH4
