WorksheetsMiddle School Science Final Exam Quiz
Total questions: 150
Worksheet time: 1hrs 15mins
Name
Class
Date
1.
What process do plants use to remove carbon dioxide from the atmosphere?
a)
Cellular respiration
b)
Photosynthesis
c)
Fermentation
d)
Combustion
2.
What do animals add to the atmosphere through cellular respiration?
a)
Oxygen
b)
Carbon dioxide
c)
Nitrogen
d)
Water vapor
3.
What human activity releases large amounts of carbon dioxide into the atmosphere?
a)
Recycling
b)
Burning fossil fuels
c)
Planting trees
d)
Using solar panels
4.
Which natural process adds carbon dioxide to the atmosphere?
a)
Photosynthesis
b)
Wildfires
c)
Evaporation
d)
Condensation
5.
How do oceans influence the carbon cycle?
a)
They produce nitrogen
b)
They absorb and store carbon dioxide
c)
They release oxygen
d)
They create fossil fuels
6.
What is the primary source of carbon dioxide in the atmosphere?
a)
Photosynthesis
b)
Cellular respiration
c)
Evaporation
d)
Condensation
7.
What effect does increased carbon dioxide have on Earth’s climate?
a)
It cools the planet
b)
It causes global warming
c)
It reduces rainfall
d)
It increases biodiversity
8.
Which process locks carbon away in Earth’s crust for long periods?
a)
Photosynthesis
b)
Geologic processes
c)
Cellular respiration
d)
Convection
9.
How do volcanoes contribute to the carbon cycle?
a)
They absorb carbon dioxide
b)
They release carbon dioxide
c)
They produce oxygen
d)
They store nitrogen
10.
What human activity increases carbon levels in the atmosphere?
a)
Planting forests
b)
Using synthetic fertilizers
c)
Recycling plastics
d)
Using wind energy
11.
What is a major reservoir for carbon in the carbon cycle?
a)
The atmosphere
b)
The deep ocean
c)
The soil surface
d)
The clouds
12.
What happens to carbon dioxide during photosynthesis?
a)
It is released into the atmosphere
b)
It is converted into glucose
c)
It is stored as nitrogen
d)
It is turned into water
13.
Which gas is a key component of the carbon cycle?
a)
Nitrogen
b)
Carbon dioxide
c)
Oxygen
d)
Hydrogen
14.
What do plants produce during photosynthesis besides glucose?
a)
Nitrogen
b)
Oxygen
c)
Carbon dioxide
d)
Water
15.
How does deforestation affect the carbon cycle?
a)
It increases carbon dioxide removal
b)
It increases carbon dioxide in the atmosphere
c)
It increases nitrogen levels
d)
It reduces oxygen production
16.
What is formed when carbon dioxide reacts with water in the ocean?
a)
Carbonic acid
b)
Sulfuric acid
c)
Nitric acid
d)
Hydrochloric acid
17.
Which process does NOT add carbon dioxide to the atmosphere?
a)
Cellular respiration
b)
Photosynthesis
c)
Burning fossil fuels
d)
Wildfires
18.
What is a long-term storage form of carbon?
a)
Glucose
b)
Fossil fuels
c)
Oxygen
d)
Water vapor
19.
How do animals contribute to the carbon cycle?
a)
By producing oxygen
b)
By releasing carbon dioxide
c)
By absorbing nitrogen
d)
By storing water
20.
Why does burning fossil fuels affect the carbon cycle?
a)
It removes carbon dioxide
b)
It releases stored carbon as carbon dioxide
c)
It increases oxygen levels
d)
It stores carbon in the soil
21.
What does the nitrogen cycle move between?
a)
The atmosphere and organisms
b)
The ocean and plants
c)
The soil and animals
d)
The atmosphere and water
22.
What organisms convert nitrogen gas into compounds plants can use?
a)
Fungi
b)
Bacteria
c)
Algae
d)
Viruses
23.
What process converts nitrogen compounds back to nitrogen gas?
a)
Nitrogen fixation
b)
Denitrification
c)
Photosynthesis
d)
Respiration
24.
How do plants obtain nitrogen?
a)
From the air directly
b)
From nitrogen compounds in the soil
c)
From carbon dioxide
d)
From sunlight
25.
What human activity affects the nitrogen cycle?
a)
Using synthetic fertilizers
b)
Planting trees
c)
Recycling paper
d)
Using solar energy
26.
What gas makes up most of the Earth’s atmosphere?
a)
Oxygen
b)
Nitrogen
c)
Carbon dioxide
d)
Hydrogen
27.
Which organisms are essential for nitrogen fixation?
a)
Plants
b)
Bacteria
c)
Animals
d)
Fungi
28.
What is the role of denitrifying bacteria?
a)
Convert nitrogen gas to compounds
b)
Convert compounds to nitrogen gas
c)
Produce oxygen
d)
Absorb carbon dioxide
29.
How does excess nitrogen from fertilizers affect ecosystems?
a)
It increases biodiversity
b)
It causes nutrient imbalances
c)
It reduces carbon levels
d)
It increases oxygen production
30.
Where is most nitrogen found on Earth?
a)
In the soil
b)
In the atmosphere
c)
In the oceans
d)
In plants
31.
What do plants use nitrogen for?
a)
To produce oxygen
b)
To make proteins
c)
To store carbon
d)
To create glucose
32.
What process makes nitrogen available to plants?
a)
Photosynthesis
b)
Nitrogen fixation
c)
Cellular respiration
d)
Denitrification
33.
What type of organism primarily performs denitrification?
a)
Plants
b)
Bacteria
c)
Animals
d)
Fungi
34.
How does nitrogen re-enter the atmosphere?
a)
Through photosynthesis
b)
Through denitrification
c)
Through respiration
d)
Through combustion
35.
What is a negative effect of excess nitrogen in water systems?
a)
Increased oxygen levels
b)
Algal blooms
c)
Reduced carbon dioxide
d)
Increased biodiversity
36.
What is biodiversity?
a)
The number of plants in an area
b)
The variety of life on Earth
c)
The amount of carbon in the atmosphere
d)
The number of ecosystems
37.
What is extinction?
a)
The migration of a species
b)
The complete disappearance of a species
c)
The growth of a population
d)
The adaptation of a species
38.
What is the main cause of the current sixth mass extinction?
a)
Volcanic eruptions
b)
Habitat loss
c)
Natural climate change
d)
Asteroid impacts
39.
What is a negative impact of extinction on biodiversity?
a)
Increased species richness
b)
Disrupted food webs
c)
More stable ecosystems
d)
Increased adaptive potential
40.
How does habitat loss affect biodiversity?
a)
It increases species diversity
b)
It reduces species survival
c)
It stabilizes ecosystems
d)
It promotes symbiosis
41.
What is a consequence of reduced biodiversity?
a)
More stable ecosystems
b)
Loss of ecological functions
c)
Increased food web stability
d)
More adaptive potential
42.
What human activity contributes to extinction?
a)
Recycling
b)
Deforestation
c)
Conservation
d)
Reforestation
43.
What is a cascading effect of extinction?
a)
Increased species diversity
b)
Disruption of other species
c)
More stable food chains
d)
Increased carbon storage
44.
Why is biodiversity important for ecosystems?
a)
It reduces competition
b)
It supports ecosystem stability
c)
It increases extinction
d)
It reduces food webs
45.
What is a major threat to biodiversity?
a)
Conservation efforts
b)
Habitat loss
c)
Increased rainfall
d)
Reforestation
46.
What does reduced adaptive potential mean for ecosystems?
a)
Easier adaptation to changes
b)
Less ability to adapt to changes
c)
More stable food webs
d)
Increased species richness
47.
What is an example of human impact on biodiversity?
a)
Planting native species
b)
Urban development
c)
Creating wildlife reserves
d)
Reducing pollution
48.
What is a result of disrupted food webs due to extinction?
a)
Increased ecosystem stability
b)
Loss of species interactions
c)
More biomass at higher trophic levels
d)
Increased carbon storage
49.
How does extinction affect ecological functions?
a)
It improves them
b)
It reduces them
c)
It has no effect
d)
It increases biodiversity
50.
What is a characteristic of high biodiversity?
a)
Few species
b)
Many different species
c)
No predators
d)
Low competition
51.
What is a human action that reduces biodiversity?
a)
Creating national parks
b)
Burning fossil fuels
c)
Recycling materials
d)
Planting trees
52.
What is a sign of a mass extinction?
a)
Increased species populations
b)
Rapid loss of many species
c)
More stable ecosystems
d)
Increased food web complexity
53.
What level of biodiversity includes different ecosystems?
a)
Genetic diversity
b)
Ecosystem diversity
c)
Species diversity
d)
Population diversity
54.
Why does extinction reduce richness?
a)
It adds new species
b)
It decreases the number of species
c)
It stabilizes food chains
d)
It increases competition
55.
What is a long-term effect of biodiversity loss?
a)
More stable ecosystems
b)
Reduced ecosystem resilience
c)
Increased species populations
d)
More complex food webs
56.
What are the two main components of an ecosystem?
a)
Biotic and abiotic factors
b)
Plants and animals only
c)
Water and air only
d)
Sunlight and soil only
57.
What is the smallest level of ecosystem organization?
a)
Biome
b)
Organism
c)
Ecosystem
d)
Biosphere
58.
What is a food web?
a)
A single food chain
b)
Multiple intersecting food chains
c)
A type of ecosystem
d)
A group of biomes
59.
What shows the transfer of energy in an ecosystem?
a)
A food chain
b)
A water cycle
c)
A nitrogen cycle
d)
A carbon cycle
60.
Why is there less biomass at the top of a food chain?
a)
Energy is lost as heat
b)
Energy is gained
c)
More producers exist
d)
Less competition occurs
61.
What is the role of decomposers in an ecosystem?
a)
Produce energy
b)
Break down dead matter
c)
Consume plants
d)
Fix nitrogen
62.
What is the largest level of ecosystem organization?
a)
Organism
b)
Population
c)
Biosphere
d)
Community
63.
What do food webs show?
a)
Water movement
b)
Feeding relationships
c)
Nitrogen cycling
d)
Carbon storage
64.
What is a trophic level?
a)
A type of biome
b)
A level in a food chain
c)
A type of symbiosis
d)
A level of biodiversity
65.
What organisms are at the base of a food chain?
a)
Consumers
b)
Producers
c)
Decomposers
d)
Predators
66.
What happens to energy as it moves up a food chain?
a)
It increases
b)
It is lost as heat
c)
It stays the same
d)
It is stored as carbon
67.
What is an example of a biotic factor in an ecosystem?
a)
Water
b)
A tree
c)
Sunlight
d)
Soil
68.
What is an example of an abiotic factor?
a)
A bird
b)
Rainfall
c)
A fish
d)
A plant
69.
What is a community in an ecosystem?
a)
A single organism
b)
All populations in an area
c)
The entire biosphere
d)
Only the producers
70.
What is a population in an ecosystem?
a)
All ecosystems in a biome
b)
All individuals of one species
c)
All abiotic factors
d)
All food webs
71.
What do consumers in a food chain do?
a)
Produce energy
b)
Eat other organisms
c)
Break down dead matter
d)
Fix nitrogen
72.
What is a biome?
a)
A single species
b)
A large area with similar climate and organisms
c)
A type of food chain
d)
A small population
73.
What is the role of producers in a food web?
a)
Eat consumers
b)
Make their own food
c)
Break down waste
d)
Compete with decomposers
74.
What is an example of a decomposer?
a)
A hawk
b)
A fungus
c)
A tree
d)
A deer
75.
Why are decomposers essential for ecosystems?
a)
They produce oxygen
b)
They recycle nutrients
c)
They consume producers
d)
They fix nitrogen
76.
What is symbiosis?
a)
Competition for resources
b)
A close, long-term interaction between species
c)
A type of food chain
d)
A single species interaction
77.
In mutualism, what happens to the species involved?
a)
Both are harmed
b)
Both benefit
c)
One benefits, one is harmed
d)
One benefits, one is unaffected
78.
What is an example of mutualism?
a)
A tick on a dog
b)
Bees pollinating flowers
c)
A lion eating a zebra
d)
A bird eating insects
79.
In commensalism, what happens to the species involved?
a)
Both are harmed
b)
One benefits, one is unaffected
c)
Both benefit
d)
One benefits, one is harmed
80.
What is an example of commensalism?
a)
A bee and a flower
b)
A barnacle on a whale
c)
A tick on a dog
d)
A lion and a hyena
81.
In parasitism, what happens to the host species?
a)
It benefits
b)
It is harmed
c)
It is unaffected
d)
It becomes extinct
82.
What is an example of parasitism?
a)
A bird nesting in a tree
b)
A flea on a dog
c)
A bee pollinating a flower
d)
A fish swimming with a shark
83.
What is carrying capacity?
a)
The number of biomes in an area
b)
The maximum number of individuals an environment can support
c)
The number of food chains
d)
The amount of nitrogen in the soil
84.
What do organisms compete for in an ecosystem?
a)
Unlimited resources
b)
Limited resources
c)
Symbiotic relationships
d)
Biomes
85.
What is an invasive species?
a)
A native species that helps the ecosystem
b)
A non-native species that causes harm
c)
A species that migrates seasonally
d)
A species that is endangered
86.
How can invasive species be introduced?
a)
By reducing pollution
b)
By accidental transport
c)
By planting native species
d)
By creating reserves
87.
What is a negative effect of invasive species?
a)
Increased biodiversity
b)
Threat to native species
c)
More stable ecosystems
d)
Improved food webs
88.
How do invasive species affect economies?
a)
They improve agriculture
b)
They harm agriculture and fisheries
c)
They increase biodiversity
d)
They stabilize ecosystems
89.
What is an example of competition in an ecosystem?
a)
Bees pollinating flowers
b)
Lions and hyenas fighting for food
c)
Barnacles on a whale
d)
A flea on a dog
90.
What can limit a population’s carrying capacity?
a)
Unlimited food
b)
Limited resources
c)
More predators
d)
Increased biodiversity
91.
What is the source of energy for photosynthesis?
a)
Glucose
b)
Sunlight
c)
Oxygen
d)
Carbon dioxide
92.
What is the equation for photosynthesis?
a)
6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂
b)
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O
c)
6CO₂ + 6O₂ → C₆H₁₂O₆ + 6H₂O
d)
C₆H₁₂O₆ + 6H₂O → 6CO₂ + 6O₂
93.
What part of a plant cell contains chlorophyll?
a)
Mitochondria
b)
Chloroplasts
c)
Nucleus
d)
Cytoplasm
94.
What do stomata in leaves do?
a)
Store glucose
b)
Let air in and out
c)
Transport water
d)
Absorb sunlight
95.
What does cellular respiration produce?
a)
Glucose and oxygen
b)
Carbon dioxide and water
c)
Nitrogen and water
d)
Glucose and carbon dioxide
96.
Where does cellular respiration primarily occur in a cell?
a)
Chloroplasts
b)
Mitochondria
c)
Nucleus
d)
Stomata
97.
What is the equation for cellular respiration?
a)
6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂
b)
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O
c)
6CO₂ + 6O₂ → C₆H₁₂O₆ + 6H₂O
d)
C₆H₁₂O₆ + 6H₂O → 6CO₂ + 6O₂
98.
How many ATP molecules are typically produced from one glucose molecule in cellular respiration?
a)
2
b)
12
c)
36-38
d)
50
99.
What process makes ATP without oxygen?
a)
Photosynthesis
b)
Fermentation
c)
Cellular respiration
d)
Nitrogen fixation
100.
What is produced in lactic acid fermentation?
a)
Alcohol
b)
Lactic acid
c)
Carbon dioxide
d)
Glucose
101.
Which organisms carry out alcoholic fermentation?
a)
Animals
b)
Yeasts
c)
All bacteria
d)
Mammals
102.
How many ATP molecules are produced in fermentation?
a)
2
b)
12
c)
36
d)
50
103.
What gas is released during alcoholic fermentation?
a)
Oxygen
b)
Carbon dioxide
c)
Nitrogen
d)
Hydrogen
104.
Where does photosynthesis occur in a plant cell?
a)
Mitochondria
b)
Chloroplasts
c)
Cytoplasm
d)
Nucleus
105.
What molecule absorbs sunlight in photosynthesis?
a)
Glucose
b)
Chlorophyll
c)
Oxygen
d)
Carbon dioxide
106.
What transports water to the leaves for photosynthesis?
a)
Stomata
b)
Xylem
c)
Phloem
d)
Chloroplasts
107.
What is the energy currency produced in cellular respiration?
a)
Glucose
b)
ATP
c)
Oxygen
d)
Carbon dioxide
108.
What is a byproduct of photosynthesis?
a)
Carbon dioxide
b)
Oxygen
c)
Water
d)
Nitrogen
109.
What is the starting molecule in cellular respiration?
a)
Oxygen
b)
Glucose
c)
Carbon dioxide
d)
Water
110.
What type of fermentation occurs in human muscles during exercise?
a)
Alcoholic fermentation
b)
Lactic acid fermentation
c)
Cellular respiration
d)
Photosynthesis
111.
What process occurs in both the cytoplasm and mitochondria?
a)
Photosynthesis
b)
Cellular respiration
c)
Fermentation
d)
Nitrogen fixation
112.
What is a chemical reaction?
a)
A physical change in shape
b)
Breaking and forming of chemical bonds
c)
A change in temperature only
d)
A change in color only
113.
If a reaction’s temperature increases, it is:
a)
Endothermic
b)
Exothermic
c)
Neutral
d)
Physical
114.
If a reaction absorbs heat, it is:
a)
Exothermic
b)
Endothermic
c)
Neutral
d)
Reversible
115.
What happens to energy when chemical bonds are broken?
a)
Energy is released
b)
Energy is absorbed
c)
No energy change
d)
Energy is created
116.
What happens to energy when chemical bonds are formed?
a)
Energy is absorbed
b)
Energy is released
c)
No energy change
d)
Energy is destroyed
117.
What does the pH scale measure?
a)
Temperature
b)
Concentration of H₃O⁺ ions
c)
Mass of a solution
d)
Volume of a liquid
118.
What is the pH of a neutral solution?
a)
0
b)
7
c)
14
d)
10
119.
What color does universal indicator turn in an acidic solution?
a)
Purple
b)
Red
c)
Green
d)
Blue
120.
What color does universal indicator turn in a basic solution?
a)
Red
b)
Purple
c)
Yellow
d)
Green
121.
What happens to pH when an acid is added to a solution?
a)
It increases
b)
It decreases
c)
It stays the same
d)
It becomes neutral
122.
What happens to pH when a base is added to a solution?
a)
It decreases
b)
It increases
c)
It stays the same
d)
It becomes acidic
123.
What is formed when carbon dioxide reacts with water?
a)
Sulfuric acid
b)
Carbonic acid
c)
Nitric acid
d)
Hydrochloric acid
124.
What is an acid according to the pH scale?
a)
pH above 7
b)
pH below 7
c)
pH equal to 7
d)
pH equal to 14
125.
What is a base according to the pH scale?
a)
pH below 7
b)
pH above 7
c)
pH equal to 7
d)
pH equal to 0
126.
What happens when a base is added to an acidic solution?
a)
It becomes more acidic
b)
It becomes less acidic
c)
It stays the same
d)
It becomes neutral instantly
127.
What happens when an acid is added to a basic solution?
a)
It becomes more basic
b)
It becomes less basic
c)
It stays the same
d)
It becomes acidic instantly
128.
What ions are equal in a neutral solution?
a)
H₃O⁺ and OH⁻
b)
H₃O⁺ and CO₂
c)
OH⁻ and O₂
d)
H₃O⁺ and N₂
129.
What is an exothermic reaction?
a)
Absorbs heat
b)
Releases heat
c)
No heat change
d)
Absorbs light
130.
What is an endothermic reaction?
a)
Releases heat
b)
Absorbs heat
c)
No heat change
d)
Releases light
131.
How can you identify an unknown substance in a chemical reaction?
a)
By its color only
b)
By its characteristic reactions
c)
By its weight only
d)
By its smell only
132.
What is the water cycle?
a)
The movement of carbon in ecosystems
b)
The recycling of water on Earth
c)
The transfer of nitrogen
d)
The production of oxygen
133.
What is a reservoir in the water cycle?
a)
A place where water is stored
b)
A place where water evaporates
c)
A place where water condenses
d)
A place where water is destroyed
134.
What is an exchange pool in the water cycle?
a)
The deep ocean
b)
The atmosphere
c)
Ice masses
d)
Aquifers
135.
What process turns liquid water into water vapor?
a)
Condensation
b)
Evaporation
c)
Precipitation
d)
Transpiration
136.
What process releases water vapor from plants?
a)
Evaporation
b)
Transpiration
c)
Condensation
d)
Precipitation
137.
What is precipitation in the water cycle?
a)
Water vapor turning into liquid
b)
Water falling as rain or snow
c)
Water evaporating from oceans
d)
Water stored in aquifers
138.
What is a biome?
a)
A single species
b)
An area with similar climate and organisms
c)
A type of food chain
d)
A small ecosystem
139.
What is a key factor defining terrestrial biomes?
a)
Ocean currents
b)
Climate
c)
Nitrogen levels
d)
Carbon storage
140.
What biome has high temperatures and low precipitation?
a)
Tundra
b)
Desert
c)
Rainforest
d)
Grassland
141.
What biome has cold temperatures and low precipitation?
a)
Tundra
b)
Rainforest
c)
Savanna
d)
Desert
142.
What adaptation do desert plants have?
a)
Thick fur
b)
Water-storing tissues
c)
Broad leaves
d)
Deep roots
143.
What is a major reservoir for water in the water cycle?
a)
The atmosphere
b)
The deep ocean
c)
The clouds
d)
The soil surface
144.
What process forms clouds in the water cycle?
a)
Evaporation
b)
Condensation
c)
Precipitation
d)
Transpiration
145.
What biome has high precipitation and warm temperatures?
a)
Tundra
b)
Rainforest
c)
Desert
d)
Grassland
146.
What adaptation do tundra animals have?
a)
Thin fur
b)
Thick fur
c)
Large leaves
d)
Water storage
147.
What role does soil play in biomes?
a)
It determines climate
b)
It supports plant growth
c)
It produces precipitation
d)
It stores carbon dioxide
148.
What is an aquifer in the water cycle?
a)
A cloud formation
b)
An underground water reservoir
c)
A type of precipitation
d)
A surface river
149.
What biome has grasses as the dominant vegetation?
a)
Rainforest
b)
Grassland
c)
Tundra
d)
Desert
150.
How does climate influence biomes?
a)
It determines the types of plants and animals
b)
It controls the water cycle
c)
It fixes nitrogen
d)
It produces carbon dioxide
100 %
