1
CST Multi-Subject Part 3: Arts &
Sciences 2025–2026 – Complete
Practice Questions and Detailed
Answers
Humans breathe in.. and out.. - Correct Answer-
Breath in oxygen and out carbon dioxide
Trees absorb.. and release.. - Correct Answer- Trees
absorb carbon dioxide and release oxygen
If we cut down a lot of trees what happens? - Correct
Answer- We REDUCE the amount of OXYGEN being
produced.
If we populate the area with a lot of animals we.. -
Correct Answer- Increase the level of C.D and
methane. BAD FOR THE AIR.
If trees or rainforests were destroyed what happens to
the environment? - Correct Answer- Increase level of
1
,2
C.D. In the air and decreased level of oxygen in the
ocean. Trees are part of the AIR balance.
City is industrialized with factories. What does this
mean? - Correct Answer- Areas with factories have
less trees; less trees=less oxygen which affects the air,
making it harder to breathe. The quality of air and
how it impacts respiratory health.
Which organism is the lowest level? - Correct Answer-
Plants; they are living organisms.
why are plants important for the ecosystem? - Correct
Answer- Source of food for animals that eat plants
and plants also create oxygen.
How would environmentalists likely make to address
the problem with the atmosphere? - Correct Answer-
To combat air pollution the city should plant many
green trees; "problem w/ the atmosphere" means
pollution.
How do trees use photosynthesis to process sunlight?
- Correct Answer- The plant takes energy from the
2
,3
sunlight and spreads hydrogen into its parts, helping
to create sugar, water, and oxygen.
Correct order of a plant life cycle: - Correct Answer-
Seeds, trees, flowers, fruits.
"Unknown species/trees" (weeds) what is so bad about
these? - Correct Answer- The trees of the unknown
species may need less sunlight and nutrients/water to
survive and can overtake her orchard and prevent the
apple trees from obtaining enough water and
nutrients, which can cause them to die out. They
grow quickly, and easily ruin a beautiful garden with
flowers.
If we cut down trees and populate the area with
animals... - Correct Answer- Less oxygen and more cd
and methane
Photosynthesis - Correct Answer- The process by
which green plants and some other organisms use
sunlight to synthesize foods from C.D and water. This
process in plans generally involves the green pigment
chlorophyll and generates oxygen as a byproduct.
3
, 4
TREE NEEDS SUNLIGHT OR CAN DIE FROM THE
IVY/WEEDS.
Nutrient life cycle of a farm: - Correct Answer-
Nutrients present in the soil
Nutrients consumed by tree and shrub
Nutrients released back into the soil
Soil breaks down the waste
Equlilibrium - Correct Answer- Opposing forces
cancel each other out; think of water: maintain it in
the way we use and waste water: full bathtub with
the water draining out at the same time that the
water is running into the bathtub.
Oxygen levels in the water support life and - Correct
Answer- Have a significant impact on species when
oxygen levels drop.
sea levels - Correct Answer- Risen by 2.6 inches; if
there are changes that disrupt the flow of the water,
like storms, it can create a storm surge that overflows
boundaries. Rising sea levels around the world due to
global warming are part of what causes extreme
4
CST Multi-Subject Part 3: Arts &
Sciences 2025–2026 – Complete
Practice Questions and Detailed
Answers
Humans breathe in.. and out.. - Correct Answer-
Breath in oxygen and out carbon dioxide
Trees absorb.. and release.. - Correct Answer- Trees
absorb carbon dioxide and release oxygen
If we cut down a lot of trees what happens? - Correct
Answer- We REDUCE the amount of OXYGEN being
produced.
If we populate the area with a lot of animals we.. -
Correct Answer- Increase the level of C.D and
methane. BAD FOR THE AIR.
If trees or rainforests were destroyed what happens to
the environment? - Correct Answer- Increase level of
1
,2
C.D. In the air and decreased level of oxygen in the
ocean. Trees are part of the AIR balance.
City is industrialized with factories. What does this
mean? - Correct Answer- Areas with factories have
less trees; less trees=less oxygen which affects the air,
making it harder to breathe. The quality of air and
how it impacts respiratory health.
Which organism is the lowest level? - Correct Answer-
Plants; they are living organisms.
why are plants important for the ecosystem? - Correct
Answer- Source of food for animals that eat plants
and plants also create oxygen.
How would environmentalists likely make to address
the problem with the atmosphere? - Correct Answer-
To combat air pollution the city should plant many
green trees; "problem w/ the atmosphere" means
pollution.
How do trees use photosynthesis to process sunlight?
- Correct Answer- The plant takes energy from the
2
,3
sunlight and spreads hydrogen into its parts, helping
to create sugar, water, and oxygen.
Correct order of a plant life cycle: - Correct Answer-
Seeds, trees, flowers, fruits.
"Unknown species/trees" (weeds) what is so bad about
these? - Correct Answer- The trees of the unknown
species may need less sunlight and nutrients/water to
survive and can overtake her orchard and prevent the
apple trees from obtaining enough water and
nutrients, which can cause them to die out. They
grow quickly, and easily ruin a beautiful garden with
flowers.
If we cut down trees and populate the area with
animals... - Correct Answer- Less oxygen and more cd
and methane
Photosynthesis - Correct Answer- The process by
which green plants and some other organisms use
sunlight to synthesize foods from C.D and water. This
process in plans generally involves the green pigment
chlorophyll and generates oxygen as a byproduct.
3
, 4
TREE NEEDS SUNLIGHT OR CAN DIE FROM THE
IVY/WEEDS.
Nutrient life cycle of a farm: - Correct Answer-
Nutrients present in the soil
Nutrients consumed by tree and shrub
Nutrients released back into the soil
Soil breaks down the waste
Equlilibrium - Correct Answer- Opposing forces
cancel each other out; think of water: maintain it in
the way we use and waste water: full bathtub with
the water draining out at the same time that the
water is running into the bathtub.
Oxygen levels in the water support life and - Correct
Answer- Have a significant impact on species when
oxygen levels drop.
sea levels - Correct Answer- Risen by 2.6 inches; if
there are changes that disrupt the flow of the water,
like storms, it can create a storm surge that overflows
boundaries. Rising sea levels around the world due to
global warming are part of what causes extreme
4
