UPCAT General Science (Extended) — Universe, Solar System & EarthExam Answer Templates

Marks

1

Topic

Formation of the Universe

Difficulty

easy

Template Id

T1

Examiner Tip

Always include the age of the universe (13.8 billion years) for full marks

Model Answer

The Big Bang Theory states that the universe originated from an extremely hot, dense singularity and began expanding 13.8 billion years ago through a massive explosion.

Question Type

very_short_answer

Answer Structure

• Single line: Complete definition with key elements [1 mark]

Scoring Breakdown

Common Mark Deductions

• Incomplete definition
• Wrong time frame
• Missing key scientific terms

Key Phrases To Include

• singularity
• 13.8 billion years
• expansion
• hot and dense

Marks

2

Topic

Rock Formation

Difficulty

easy

Template Id

T2

Examiner Tip

Remember intrusive = inside (slow cooling), extrusive = outside (fast cooling)

Model Answer

1. Intrusive igneous rocks: Granite (formed when magma cools slowly beneath Earth's surface) 2. Extrusive igneous rocks: Basalt (formed when lava cools rapidly on Earth's surface)

Question Type

short_answer

Answer Structure

• Point 1: Type 1 with example [1 mark]
• Point 2: Type 2 with example [1 mark]

Scoring Breakdown

Common Mark Deductions

• Wrong examples
• Missing formation process
• Confusing intrusive and extrusive

Key Phrases To Include

• intrusive
• extrusive
• magma
• lava
• granite
• basalt

Marks

3

Topic

Continental Drift Theory

Difficulty

medium

Template Id

T3

Examiner Tip

Always mention Wegener's name and give specific fossil examples like Mesosaurus

Model Answer

Alfred Wegener proposed four main evidences for Continental Drift Theory: 1. Apparent fit of continents: Coastlines of South America and Africa fit together like puzzle pieces 2. Fossil correlation: Similar fossils like Mesosaurus found on different continents that are now separated by oceans 3. Rock and mountain correlation: Similar rock formations and mountain chains found across different continents

Question Type

short_answer

Answer Structure

• Point 1: Continental fit evidence [1 mark]
• Point 2: Fossil evidence with example [1 mark]
• Point 3: Rock/mountain correlation [1 mark]

Scoring Breakdown

Common Mark Deductions

• Missing specific examples
• Only mentioning 2 evidences
• Incorrect scientist name

Key Phrases To Include

• Alfred Wegener
• Continental Drift
• Mesosaurus
• puzzle pieces
• similar rock formations

Marks

3

Topic

Earth System

Difficulty

medium

Template Id

T4

Examiner Tip

Remember the pattern: litho=solid, hydro=water, atmo=air, bio=life

Model Answer

The four main spheres of Earth are: 1. Lithosphere: The solid outer part including crust and uppermost mantle 2. Hydrosphere: All water on Earth in liquid, solid, and gaseous forms 3. Atmosphere: The gaseous layer surrounding Earth held by gravity 4. Biosphere: Contains all living organisms on Earth

Question Type

short_answer

Answer Structure

• Point 1: Lithosphere with characteristic [0.75 marks]
• Point 2: Hydrosphere with characteristic [0.75 marks]
• Point 3: Atmosphere with characteristic [0.75 marks]
• Point 4: Biosphere with characteristic [0.75 marks]

Scoring Breakdown

Common Mark Deductions

• Missing one sphere
• Incorrect characteristics
• Vague descriptions

Key Phrases To Include

• lithosphere
• hydrosphere
• atmosphere
• biosphere
• solid
• water
• gaseous
• living organisms

Marks

3

Topic

Earthquakes

Difficulty

medium

Template Id

T5

Examiner Tip

Remember: epicenter is on the surface (epi=above), hypocenter is below (hypo=under)

Model Answer

Earthquake is the sudden release of energy in Earth's crust due to movement of tectonic plates, generating seismic waves. Epicenter: The point on Earth's surface directly above the origin of an earthquake Hypocenter (Focus): The actual point beneath Earth's surface where the earthquake originates

Question Type

short_answer

Answer Structure

• Line 1: Definition of earthquake [1 mark]
• Line 2: Epicenter definition [1 mark]
• Line 3: Hypocenter definition [1 mark]

Scoring Breakdown

Common Mark Deductions

• Incomplete earthquake definition
• Confusing epicenter and hypocenter
• Missing mention of seismic waves

Key Phrases To Include

• sudden release of energy
• tectonic plates
• seismic waves
• surface point
• underground origin

Marks

2

Topic

Atmosphere

Difficulty

easy

Template Id

T6

Examiner Tip

Remember troposphere is where we live and where all weather happens

Model Answer

Troposphere Characteristics: 1. Contains half of Earth's atmosphere and most water vapor 2. Temperature decreases with altitude (air is warmer near ground)

Question Type

short_answer

Answer Structure

• Name: Troposphere [0.5 marks]
• Characteristic 1 [0.75 marks]
• Characteristic 2 [0.75 marks]

Scoring Breakdown

Common Mark Deductions

• Wrong atmospheric layer
• Vague characteristics
• Mixing up layer properties

Key Phrases To Include

• troposphere
• weather
• temperature decreases
• water vapor
• closest to surface

Marks

5

Topic

Hydrosphere

Difficulty

medium

Template Id

T7

Examiner Tip

Always mention that solar energy drives the water cycle and explain each process step-by-step

Model Answer

The water cycle, also called the hydrologic cycle, is the continuous movement of water through Earth's spheres, driven by solar energy. Four main processes: 1. Evaporation: Solar energy heats surface water in oceans, lakes, and rivers, converting liquid water to water vapor that rises into the atmosphere 2. Condensation: Water vapor in the atmosphere cools and condenses around dust particles to form tiny water droplets, creating clouds 3. Precipitation: Water droplets in clouds combine and become heavy enough to fall as rain, snow, sleet, or hail back to Earth's surface 4. Collection/Runoff: Precipitation collects in water bodies, infiltrates into groundwater, or flows as surface runoff back to oceans, completing the cycle

Question Type

long_answer

Answer Structure

• Introduction: Definition and energy source [1 mark]
• Process 1: Evaporation with explanation [1 mark]
• Process 2: Condensation with explanation [1 mark]
• Process 3: Precipitation with explanation [1 mark]
• Process 4: Collection/runoff with explanation [1 mark]

Scoring Breakdown

Common Mark Deductions

• Missing energy source
• Incorrect process explanations
• Not mentioning cycle nature
• Vague descriptions

Key Phrases To Include

• hydrologic cycle
• solar energy
• evaporation
• condensation
• precipitation
• collection
• water vapor
• continuous movement

Marks

5

Topic

Solar System

Difficulty

medium

Template Id

T8

Examiner Tip

Use a comparison format and mention specific planet names as examples

Model Answer

Terrestrial Planets (Mercury, Venus, Earth, Mars): 1. Composition: Made of rock and metal with high melting points (silicates, iron, nickel) 2. Size and density: Smaller size but higher density 3. Atmosphere: Thin atmospheres or no atmosphere 4. Location: Inner planets, closer to the Sun 5. Rotation: Slower rotation speeds Gas Giants (Jupiter, Saturn, Uranus, Neptune): 1. Composition: Dominated by gases (hydrogen, helium) and ices (water, ammonia, methane) 2. Size and density: Larger size but lower density 3. Atmosphere: Thick gaseous atmospheres 4. Location: Outer planets, farther from the Sun 5. Rotation: Faster rotation speeds

Question Type

long_answer

Answer Structure

• Terrestrial planets definition and examples [1 mark]
• Three characteristics of terrestrial planets [1.5 marks]
• Gas giants definition and examples [1 mark]
• Three characteristics of gas giants [1.5 marks]

Scoring Breakdown

Common Mark Deductions

• Incorrect planet classifications
• Missing key characteristics
• Confusing inner and outer planets

Key Phrases To Include

• terrestrial
• gas giants
• rocky
• gaseous
• inner planets
• outer planets
• density
• composition

Marks

2

Topic

Atmosphere and Climate

Difficulty

easy

Template Id

T9

Examiner Tip

Remember that greenhouse effect is natural and necessary - it's the enhanced greenhouse effect that causes global warming

Model Answer

Greenhouse effect is the process where certain gases in Earth's atmosphere trap heat from the Sun, keeping Earth warm enough to support life. Three greenhouse gases: Carbon dioxide (CO₂), Methane (CH₄), Water vapor (H₂O)

Question Type

short_answer

Answer Structure

• Definition of greenhouse effect [1 mark]
• Three greenhouse gases listed [1 mark]

Scoring Breakdown

Common Mark Deductions

• Incomplete definition
• Wrong gases listed
• Missing the warming aspect

Key Phrases To Include

• greenhouse effect
• trap heat
• atmosphere
• carbon dioxide
• methane
• water vapor

Marks

3

Topic

Seafloor Spreading

Difficulty

medium

Template Id

T10

Examiner Tip

Always mention the Mid-Atlantic Ridge as a classic example of seafloor spreading

Model Answer

Seafloor spreading theory, proposed by Harry H. Hess in 1960, explains how new oceanic crust is formed. Process: Magma from Earth's mantle rises at mid-oceanic ridges, fills the gap between two oceanic crusts, and pushes them outward. Result: New oceanic crust is continuously formed while older crust is subducted beneath continental crust.

Question Type

short_answer

Answer Structure

• Scientist and year [0.5 marks]
• Process explanation [1.5 marks]
• Result/outcome [1 mark]

Scoring Breakdown

Common Mark Deductions

• Wrong scientist name
• Missing the ridge concept
• Not explaining the continuous process

Key Phrases To Include

• Harry Hess
• 1960
• mid-oceanic ridge
• magma rises
• new oceanic crust
• subduction

Marks

3

Topic

Plate Tectonics

Difficulty

medium

Template Id

T11

Examiner Tip

Remember the Philippine Trench as a local example of convergent boundary

Model Answer

1. Divergent movement: Two plates move away from each other, forming mid-oceanic ridges (Example: Mid-Atlantic Ridge) 2. Convergent movement: Two plates collide, forming mountains or trenches (Example: Himalayas formation) 3. Transform/Lateral movement: Two plates slide sideways past each other, causing earthquakes (Example: San Andreas Fault)

Question Type

short_answer

Answer Structure

• Divergent movement with example [1 mark]
• Convergent movement with example [1 mark]
• Transform movement with example [1 mark]

Scoring Breakdown

Common Mark Deductions

• Incorrect movement descriptions
• Wrong or missing examples
• Confusing plate movement types

Key Phrases To Include

• divergent
• convergent
• transform
• move away
• collide
• slide sideways
• Mid-Atlantic Ridge
• San Andreas Fault

Marks

3

Topic

Habitable Earth

Difficulty

easy

Template Id

T12

Examiner Tip

Use the term 'Goldilocks Zone' - not too hot, not too cold, just right for life

Model Answer

Three factors that make Earth habitable: 1. Goldilocks Zone: Earth orbits at the right distance from the Sun where water remains liquid 2. Protective atmosphere: Contains oxygen and ozone layer that blocks harmful radiation 3. Magnetic field: Earth's magnetic field protects from solar wind and cosmic radiation

Question Type

short_answer

Answer Structure

• Factor 1: Distance from Sun/Goldilocks Zone [1 mark]
• Factor 2: Atmosphere protection [1 mark]
• Factor 3: Magnetic field protection [1 mark]

Scoring Breakdown

Common Mark Deductions

• Vague explanations
• Missing the protection aspect
• Incorrect scientific terms

Key Phrases To Include

• Goldilocks Zone
• liquid water
• atmosphere
• ozone layer
• magnetic field
• radiation protection

Marks

2

Topic

Earthquakes and Seismic Waves

Difficulty

medium

Template Id

T13

Examiner Tip

Remember P=Primary=first to arrive=faster, S=Secondary=second to arrive=slower

Model Answer

P waves (Primary waves): Faster, compressional waves that push and pull rock particles, can travel through solids and liquids S waves (Secondary waves): Slower, shear waves that move rock particles side to side, cannot travel through liquids

Question Type

short_answer

Answer Structure

• P wave characteristics [1 mark]
• S wave characteristics [1 mark]

Scoring Breakdown

Common Mark Deductions

• Confusing wave types
• Missing travel medium differences
• Incorrect speed comparison

Key Phrases To Include

• P waves
• S waves
• primary
• secondary
• compressional
• shear
• faster
• slower
• liquids

Marks

5

Topic

Solar System Formation

Difficulty

hard

Template Id

T14

Examiner Tip

Always mention the age (4.6 billion years) and explain why inner planets are rocky while outer planets are gaseous

Model Answer

Formation of the Solar System (4.6 billion years ago): 1. Stellar explosion: A massive star in the Milky Way galaxy underwent fusion, burned its hydrogen and heavier elements, then exploded as a supernova 2. Matter dispersal: The explosion scattered matter and energy in all directions throughout space 3. Gravitational collapse: Through gravitational forces, the dispersed matter cooled and began to collect in key areas of space 4. Solar nebula formation: A rotating disk of gas and dust called the solar nebula formed with the proto-Sun at the center 5. Planetary formation: Heavier particles near the Sun formed the inner rocky planets, while lighter gases farther out formed the outer gas giants. The asteroid belt represents leftover material that failed to form a planet due to Jupiter's gravitational influence

Question Type

long_answer

Answer Structure

• Initial stellar explosion [1 mark]
• Matter dispersal process [1 mark]
• Gravitational collapse [1 mark]
• Solar nebula formation [1 mark]
• Planetary differentiation [1 mark]

Scoring Breakdown

Common Mark Deductions

• Missing time frame
• Incomplete formation sequence
• Not explaining gravitational role
• Missing planetary differentiation

Key Phrases To Include

• 4.6 billion years
• stellar explosion
• supernova
• gravitational forces
• solar nebula
• rocky planets
• gas giants
• asteroid belt

Marks

1

Topic

Volcanoes

Difficulty

easy

Template Id

T15

Examiner Tip

Mount Mayon is the perfect example of a composite volcano due to its perfect cone shape

Model Answer

Composite volcano (Stratovolcano) - Example: Mount Mayon in Albay

Question Type

very_short_answer

Answer Structure

• Volcano type and Philippine example [1 mark]

Scoring Breakdown

Common Mark Deductions

• Wrong volcano type
• Non-Philippine example
• Incorrect volcano name

Key Phrases To Include

• composite volcano
• stratovolcano
• Mount Mayon
• Philippine volcano