🌱 Life Science
1. From Molecules to Organisms (Structures & Processes)
Which structure in a plant cell is responsible for photosynthesis?
A. Nucleus
B. Mitochondria
C. Chloroplast
D. Ribosome
2. Ecosystems: Interactions, Energy, and Dynamics
A rabbit population in a meadow decreases sharply after several foxes move into the area. This is an example of:
A. Mutualism
B. Predator-prey relationship
C. Symbiosis
D. Competition within the species
3. Heredity: Inheritance and Variation of Traits
In pea plants, tall (T) is dominant over short (t). Which offspring ratio results from crossing Tt × Tt?
A. 25% tall, 75% short
B. 50% tall, 50% short
C. 75% tall, 25% short
D. 100% tall
4. Biological Evolution: Unity & Diversity
Why do Darwin’s finches on the Galápagos Islands have different beak shapes?
A. Random chance
B. Natural selection based on available food
C. Climate change only
D. Migration patterns
⚡ Physical Science
5. Matter and Its Interactions
Salt dissolving in water is best described as:
A. Physical change
B. Chemical change
C. Formation of a new substance
D. Nuclear reaction
6. Motion and Stability: Forces and Interactions
A soccer ball is at rest. What must happen for it to start moving?
A. Gravity must increase
B. A force must act on it
C. Friction must decrease to zero
D. Its mass must change
7. Forces and Newton’s Laws
A car accelerates more quickly when it is empty than when full of passengers. This demonstrates Newton’s:
A. First Law
B. Second Law
C. Third Law
D. Law of Gravity
8. Matter Interactions
Which particles are found in the nucleus of an atom?
A. Protons and electrons
B. Protons and neutrons
C. Electrons only
D. Neutrons only
🌍 Earth & Space Science
9. Earth’s Place in the Universe
Why do we see different constellations in the night sky at different times of year?
A. Stars move around Earth
B. Earth revolves around the Sun
C. The Moon blocks some stars
D. Earth rotates on its axis
10. Earth’s Systems
Which sphere includes rivers, oceans, and groundwater?
A. Atmosphere
B. Biosphere
C. Geosphere
D. Hydrosphere
11. Earth & Human Activity
Burning fossil fuels mainly increases which gas in the atmosphere?
A. Oxygen
B. Carbon dioxide
C. Nitrogen
D. Hydrogen
12. Human Impact
Why are renewable energy sources (like wind and solar) considered better for the environment than fossil fuels?
A. They are cheaper to install
B. They never require maintenance
C. They produce less pollution and greenhouse gases
D. They are always available in every location
✨ Challenge Questions
13. Ecosystem Energy Flow
Only about 10% of energy moves from one trophic level to the next in a food chain. What happens to most of the other 90%?
A. Stored in bones and teeth
B. Lost as heat and life processes
C. Turned into fossil fuels
D. Destroyed completely
14. Earth & Space
If Earth’s axis were not tilted, what would change?
A. The length of a day
B. The seasons would disappear
C. The Moon would not orbit Earth
D. Earth would stop rotating
15. Forces & Interactions
Two students push on a box from opposite sides with equal force. The box does not move. What type of forces are acting?
A. Balanced forces
B. Unbalanced forces
C. Gravitational forces
D. Magnetic forces
✅ Answer Key
ReplyDelete🌱 Life Science
1. C – Chloroplast
Plants make food (photosynthesis) in chloroplasts, which contain chlorophyll.
2. B – Predator-prey relationship
Foxes eat rabbits, so the population drops when predators increase.
3. C – 75% tall, 25% short
Tt × Tt → TT, Tt, Tt, tt → 3 tall : 1 short.
4. B – Natural selection based on available food
Different beak shapes evolved because finches adapted to different food sources.
⚡ Physical Science
5. A – Physical change
Salt dissolving in water doesn’t make a new substance; it’s reversible.
6. B – A force must act on it
Newton’s First Law: An object at rest stays at rest unless a force acts.
7. B – Newton’s Second Law
F = ma → more mass = harder to accelerate. Empty car accelerates faster.
8. B – Protons and neutrons
The nucleus contains protons (positive) and neutrons (neutral). Electrons orbit outside.
🌍 Earth & Space Science
9. B – Earth revolves around the Sun
As Earth orbits, our view of the stars changes, so constellations appear seasonal.
10. D – Hydrosphere
The hydrosphere includes all water on Earth (oceans, lakes, groundwater).
11. B – Carbon dioxide
Burning fossil fuels releases large amounts of CO₂, contributing to climate change.
12. C – They produce less pollution and greenhouse gases
Renewable sources don’t release as much CO₂ or harmful emissions.
✨ Challenge
13. B – Lost as heat and life processes
Most energy is used for growth, movement, and heat — not passed on.
14. B – The seasons would disappear
Seasons happen because Earth’s axis is tilted. Without tilt → same season all year.
15. A – Balanced forces
Equal forces in opposite directions cancel out → no movement.