name:______ date:______ period:____
environmental science final exam: test a
please do not write on this test. you must use the answer sheet provided.
multiple - choice questions (70): please answer any 50 questions (100 points)
1. what is an ecosystem?
a. all the plants in an area b. all the animals in an area
c. living and nonliving things interacting in an area d. nonliving parts of nature
2. which energy source depends directly on weather conditions?
a. coal b. nuclear
c. solar d. oil
3. energy efficiency refers to—
a. using more energy b. producing pollution
c. getting more work from less energy d. storing energy
4. choosing renewable energy sources helps protect—
a. only animals b. only plants
c. the environment d. electricity
5. decomposers are important because they—
a. produce energy b. break down dead organisms
c. eat only plants d. hunt animals
6. a food chain shows—
a. all feeding relationships b. energy transfer between organisms
c. population size d. habitat location
7. most energy in an ecosystem originally comes from—
a. soil b. water
c. the sun d. decomposers
8. which trophic level has the most energy?
a. primary consumers b. secondary consumers
c. producers d. tertiary consumers
9. the water cycle includes—
a. evaporation, condensation, precipitation b. photosynthesis only
c. decomposition only d. respiration only
10. nitrogen - fixing bacteria help plants by—
a. removing nitrogen b. turning nitrogen into usable forms
c. adding carbon dioxide d. producing oxygen
11. which process returns carbon dioxide to the atmosphere?
a. photosynthesis b. respiration
c. nitrogen fixation d. evaporation

Question

name:______ date:______ period:____
environmental science final exam: test a
please do not write on this test. you must use the answer sheet provided.
multiple - choice questions (70): please answer any 50 questions (100 points)
1. what is an ecosystem?
a. all the plants in an area  b. all the animals in an area
c. living and nonliving things interacting in an area  d. nonliving parts of nature
2. which energy source depends directly on weather conditions?
a. coal  b. nuclear
c. solar  d. oil
3. energy efficiency refers to—
a. using more energy  b. producing pollution
c. getting more work from less energy  d. storing energy
4. choosing renewable energy sources helps protect—
a. only animals  b. only plants
c. the environment  d. electricity
5. decomposers are important because they—
a. produce energy  b. break down dead organisms
c. eat only plants  d. hunt animals
6. a food chain shows—
a. all feeding relationships  b. energy transfer between organisms
c. population size  d. habitat location
7. most energy in an ecosystem originally comes from—
a. soil  b. water
c. the sun  d. decomposers
8. which trophic level has the most energy?
a. primary consumers  b. secondary consumers
c. producers  d. tertiary consumers
9. the water cycle includes—
a. evaporation, condensation, precipitation  b. photosynthesis only
c. decomposition only  d. respiration only
10. nitrogen - fixing bacteria help plants by—
a. removing nitrogen  b. turning nitrogen into usable forms
c. adding carbon dioxide  d. producing oxygen
11. which process returns carbon dioxide to the atmosphere?
a. photosynthesis  b. respiration
c. nitrogen fixation  d. evaporation

Accepted Answer

### Question 1
# Brief Explanations:
An ecosystem consists of both living (biotic) and non - living (abiotic) components that interact with each other in a particular area. Option A only considers plants (a part of living things), Option B only considers animals (a part of living things), and Option D only considers non - living parts. So the correct answer is the one that includes both living and non - living interactions.
# Answer:
C. Living and nonliving things interacting in an area

### Question 2
# Brief Explanations:
Solar energy is directly dependent on weather conditions as factors like cloud cover can affect the amount of solar energy received. Coal, nuclear, and oil energy sources are not directly dependent on weather in the same way as solar. Coal and oil are fossil fuels, and nuclear energy production is not related to weather.
# Answer:
C. Solar

### Question 3
# Brief Explanations:
Energy efficiency is about getting a greater amount of useful work out of a given amount of energy, or using less energy to do the same amount of work. Option A is the opposite of energy efficiency, Option B is related to pollution (not energy efficiency), and Option D is about storing energy (not efficiency).
# Answer:
C. Getting more work from less energy

### Question 4
# Brief Explanations:
Renewable energy sources (like solar, wind, hydro) are more environmentally friendly as they produce less pollution and are sustainable. Choosing them helps protect the environment. They do not only protect animals (Option A) or only plants (Option B), and electricity is a form of energy transfer, not what is being protected.
# Answer:
C. The environment

### Question 5
# Brief Explanations:
Decomposers play a crucial role in an ecosystem by breaking down dead organisms and recycling nutrients back into the ecosystem. They do not produce energy (Option A), they do not only eat plants (Option C), and they do not hunt animals (Option D).
# Answer:
B. Break down dead organisms

### Question 6
# Brief Explanations:
A food chain specifically shows the transfer of energy between organisms in a linear sequence of who eats whom. Option A is what a food web shows (all feeding relationships), Option C is about population size (not related to food chains), and Option D is about habitat location (not related to food chains).
# Answer:
B. Energy transfer between organisms

### Question 7
# Brief Explanations:
In an ecosystem, almost all the energy originates from the Sun. Producers (like plants) capture solar energy through photosynthesis, and this energy then flows through the food chain. Soil, water, and decomposers do not provide the original energy for the ecosystem.
# Answer:
C. The Sun

### Question 8
# Brief Explanations:
In a trophic level pyramid, producers (usually plants) have the most energy. Producers capture energy from the Sun, and as energy moves up the trophic levels (to primary, secondary, and tertiary consumers), energy is lost at each level (due to respiration, heat loss, etc.). So producers have more energy than primary, secondary, or tertiary consumers.
# Answer:
C. Producers

### Question 9
# Brief Explanations:
The water cycle consists of processes like evaporation (liquid water to vapor), condensation (water vapor to liquid droplets), and precipitation (water falling from the atmosphere to the Earth's surface). Decomposition is part of nutrient cycles, photosynthesis and respiration are part of the carbon cycle.
# Answer:
A. Evaporation, condensation, precipitation

### Question 10
# Brief Explanations:
Nitrogen - fixing bacteria convert atmospheric nitrogen (which is in a form not usable by plants) into forms like ammonia, nitrates, etc. that plants can use. They do not remove nitrogen (Option A), they do not add carbon dioxide (Option C), and they do not produce oxygen (Option D).
# Answer:
B. Turning nitrogen into usable forms

### Question 11
# Brief Explanations:
Respiration is the process by which organisms (plants, animals, etc.) break down organic matter and release carbon dioxide into the atmosphere. Photosynthesis takes in carbon dioxide, and nitrogen fixation is related to nitrogen, not carbon dioxide. Evaporation is part of the water cycle.
# Answer:
B. Respiration

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