MIDTERM EXAMINATION
ENVISCI1: ENVIRONMENTAL SCIENCE AND ENGINEERING
Name: _____________________________________________ Program & Section: _____________
Score: ___________
Part 1: Objective Type/Multiple Choice
Direction: Read the sentences carefully and encircle the best answer
1. This type of pollution occurs when
2. harmful chemicals from industries, c. Community
pesticides, and fertilizers enter water d. Ecosystem
bodies. It can be toxic to aquatic life 8. The interdisciplinary study that uses
and humans who consume information and ideas from the
contaminated water. physical, social science
a. Chemical pollution and humanities.
b. Biological pollution a. Environmental Science
c. Nutrient pollution b. Biological Science
d. Thermal pollution c. Chemistry
3. This type of pollution occurs because d. Physical Science
of excessive elements such as 9. An ecological organization that is
nitrogen and phosphorus, which composed of interacting populations
enter water bodies from agricultural in a given area.
runoff. This leads to excessive algae a. Community
growth, which depletes oxygen b. Organism
levels in the water and harms c. Population
aquatic organisms. d. Biome
a. Chemical pollution 10. Which of the following is an abiotic
b. Biological pollution component of the ecosystem?
c. Nutrient pollution a. tree species
d. Thermal pollution b. no. of insect species
4. This type of pollution is caused by c. temperature
the presence of harmful bacteria, d. mosses and algae
viruses, and parasites in the water, 11. _________ is a discrete group of
often due to untreated sewage and organisms of the same kind.
waste disposal. a. Genes
a. Chemical pollution b. Community
b. Biological pollution c. Species
c. Nutrient pollution d. Ecology
d. Thermal pollution 12.These are the natural occurrences
5. This type of pollution causing that happen in our ecosystems and
temperature fluctuations that disturb are important in the cycling of
marine ecosystems and reduce materials for the maintenance and
oxygen levels. survival of the organism.
a. Chemical pollution a. Nitrogen Cycle
b. Biological pollution b. Biogeochemical Cycle
c. Nutrient pollution c. Carbon Cycle
d. Thermal pollution d. Water Cycle
6. The study of living organisms and 13. This is also known as the hydrologic
interactions with the environment is cycle that describes the continuous
known as ________. movement of water on, above and
a. Ecosystem below the surface of the earth.
b. Environment a. Nitrogen Cycle
c. Community b. Biogeochemical Cycle
d. Ecology c. Carbon Cycle
7. The collection of the same species d. Water Cycle
within an area is called ___________. 14. How many percent of nitrogen gas
a. Population are present in the atmosphere?
b. Organism a. 21%
b. 78% 23. The decomposers include the
c. 65% following types of organisms except
d. 5% one.
15. What is the process of converting a. Fungi
ammonia into nitrites by the b. Protozoans
nitrifying bacteria in the soil? c. Animals
a. Nitrogen-fixation d. Bacteria
b. Nitrification 24. The increase in global temperature
c. Ammonification is known as _________.
d. Denitrification a. The greenhouse effect
16. Before atmospheric nitrogen can be b. Acid Rain
made available to plants c. Global warming
and animals, it must first d. Pollution
be converted by which bacteria? 25. How do greenhouse gases affect the
a. Denitrifying bacteria Earth's Atmosphere?
b. Nitrifying bacteria a. They cool the atmosphere
c. Nitrogen-fixing bacteria b. They heat the atmosphere
d. All of the above c. They block incoming radiation
17. A relationship in which one member from the Sun.
of the association benefits while the d. They slow the loss of heat
other is harmed. 26. Which of the following is an example
a. Predation of a non-renewable resource?
b. Mutualism a. Sun
c. Symbiosis b. Wind
d. All of the above c. Coal
18. All energy in a food chain originates d. Water
from the ________. 27. A relationship of a producer and
a. Plant consumer is best represented by
b. The Sun a. A snake eating a bird
c. Humans b. A lion eating a zebra
d. Animals c. A fox eating a mouse
19. A food web is __________. d. A zebra eating grass
a. Is made of spiders 28.It is a type of Heterotrophs that only
b. Shows how feeding plants.
relationships are interlinked a. Herbivores
c. Shows the number of b. Omnivores
organisms in a habitat c. Carnivores
d. Only shows important species d. Detritivores
in a habitat 29. What type of ecological pyramid
20. The biggest impact is made on the provides the best representation of
environment by _________. the overall nature of an ecosystem?
a. Migration of organisms a. Pyramid of numbers
b. Predation b. Pyramid of biomass
c. Competition c. Pyramid of energy
d. Human interference d. Pyramid of tropics
21. Tapeworms live inside organisms 30.What is known as the breakdown of
and feed on the nutrients of the food complex organic matter into
they eat. A tapeworm is an example inorganic substances like carbon
of what type of relationship? dioxide, water, and nutrients?
a. Mutualism a. Productivity
b. Parasitism b. Decomposition
c. Commensalism c. Energy Flow
d. Cannibalism d. Nutrient Cycling
22. Temperature, light, air, water, soil, 31.It is known as a transfer of energy
and climate are all __________ parts of from one form to another through
the environment. series of organisms with repeated
a. Biotic stages of eating and being eaten.
b. Abiotic a. Pyramid of biomass
c. Boreal b. Pyramid of energy
d. Living c. Ecological pyramid
d. Food chain
32.It is a graphical representation of the a. Herbivores
energy of successive tropic levels in b. Omnivores
an ecosystem c. Carnivores
a. Food chain d. Detritivores
b. Food web 35.The type of Heterotrophs that
c. Ecological pyramid consumes plants and animals.
d. Grazing a. Herbivores
33.It is a type of a living component of b. Omnivores
an ecosystem wherein they produce c. Carnivores
their own food. d. Detritivores
a. Heterotrophs 35.It is known as the living component
b. Autotrophs of an Ecosystem.
c. Decomposers a. Abiotic Component
d. Herbivores b. Biotic Component
34.It is a type of Heterotrophs that only c. Energy Component
eat meat. d. All of the above
Part 2: Questions/Enumeration
1. Enumerate the steps of Nitrogen Cycle. (5 pts.)
2. Enumerate the types of Ecological Pyramid. (3 pts.)
3. Enumerate the types of Food Chain. (2 pts.)
4. Explain the denitrification process in a nitrogen cycle. (5 pts.)
5. Explain the nitrogen fixation process in a nitrogen cycle. (5 pts.)
6. Enumerate the “big six” of the cycling of elements in the realm of biogeochemical
cycle. (6 pts.)
7. There are two secrets of survival in an Ecosystem. Explain each. (10pts.)
