Instructions
Read each question carefully. For Part A, circle the letter of the best answer or select True/False. For Part B, write your answer in the space provided. Answer all questions to the best of your ability.
Part A: Objective Questions
- Which two organelles are found in a plant cell but NOT in an animal cell?
- a) Nucleus and Mitochondria
- b) Cell Wall and Chloroplasts
- c) Ribosomes and Cytoplasm
- d) Cell Membrane and Vacuole
- Which process describes a gas turning directly into a solid, skipping the liquid phase?
- a) Condensation
- b) Sublimation
- c) Deposition
- d) Evaporation
- Friction is a force that helps objects start moving.
- a) True
- b) False
- Which planet is known as the "Red Planet" due to its iron oxide-rich surface?
- a) Venus
- b) Jupiter
- c) Mars
- d) Saturn
- Rusting iron is an example of a physical change.
- a) True
- b) False
- What is the main function of red blood cells in the circulatory system?
- a) Fighting infection
- b) Helping blood to clot
- c) Carrying oxygen
- d) Carrying nutrients
- The movement of Earth's tectonic plates is a primary cause of:
- a) Hurricanes and tornadoes
- b) Earthquakes and volcanoes
- c) The water cycle
- d) Global warming
- Sound waves can travel through a vacuum (like outer space).
- a) True
- b) False
- Which of the following is a "producer" in a food web?
- a) Lion
- b) Rabbit
- c) Mushroom
- d) Grass
- A stretched rubber band has kinetic energy.
- a) True
- b) False
Part B: Subjective Questions
- Explain the role of the mitochondria in a cell.
- What is photosynthesis? Write the basic word equation for it.
- Describe one key difference between a vein and an artery.
- In genetics, what is a "dominant" allele?
- Give an example of a producer, a primary consumer, and a secondary consumer in a simple food chain.
- What is an atom? Name its three main subatomic particles.
- Differentiate between a physical change and a chemical change. Provide one example of each.
- Explain Newton's First Law of Motion (the law of inertia).
- What is the difference between potential energy and kinetic energy?
- In the space below, draw a simple series circuit with a battery, an open switch, and two light bulbs.
- Define "density".
- What is the difference between an element and a compound?
- Name the three main types of rocks in the rock cycle.
- Briefly describe the process of evaporation in the water cycle.
- What is the difference between weather and climate?
- Why do we experience different seasons on Earth?
- What is a fossil and how is it typically formed?
- What is the function of the diaphragm in the human respiratory system?
- Explain why a hot air balloon rises.
- What is the Earth's rocky, outermost layer called?
Answer Key
Part A: Objective Questions
- b) Cell Wall and Chloroplasts
- c) Deposition
- b) False
- c) Mars
- b) False (It's a chemical change)
- c) Carrying oxygen
- b) Earthquakes and volcanoes
- b) False (Sound requires a medium to travel)
- d) Grass
- b) False (It has potential energy)
Part B: Subjective Questions
- The mitochondria is the "powerhouse" of the cell. It generates most of the cell's supply of adenosine triphosphate (ATP), used as a source of chemical energy.
- Photosynthesis is the process used by plants, algae, and some bacteria to convert light energy into chemical energy. Word Equation: Carbon Dioxide + Water --(Sunlight)--> Glucose + Oxygen.
- Arteries carry oxygenated blood away from the heart (and have thick, muscular walls), while veins carry deoxygenated blood toward the heart (and have thinner walls with valves).
- A dominant allele is a variation of a gene that will produce a certain phenotype (trait), even in the presence of other alleles. It is represented by a capital letter.
- Example: Grass (producer) -> Rabbit (primary consumer) -> Fox (secondary consumer). (Accept any valid food chain).
- An atom is the smallest unit of matter that forms a chemical element. Its three main subatomic particles are protons, neutrons, and electrons.
- A physical change alters the form of a substance, but not its chemical composition (e.g., ice melting into water). A chemical change results in a new substance with a different chemical composition (e.g., wood burning to become ash and smoke).
- Newton's First Law states that an object at rest will stay at rest, and an object in motion will stay in motion with the same speed and in the same direction, unless acted upon by an unbalanced force.
- Potential energy is stored energy (e.g., a book on a shelf). Kinetic energy is the energy of motion (e.g., a falling book).
- (Drawing should show a power source symbol, a symbol for an open switch, and two symbols for bulbs, all connected in a single loop).
- Density is the measure of how much mass is contained in a given unit of volume (Density = Mass / Volume).
- An element is a pure substance consisting of only one type of atom (e.g., Oxygen, O). A compound is a substance formed when two or more different chemical elements are chemically bonded together (e.g., Water, Hâ‚‚O).
- Igneous, Sedimentary, and Metamorphic.
- Evaporation is the process where liquid water on the Earth's surface heats up (usually by the sun) and turns into water vapor (a gas), rising into the atmosphere.
- Weather refers to the short-term atmospheric conditions in a specific place (e.g., it's rainy today). Climate is the long-term average of weather patterns in a region over many years.
- We experience seasons because the Earth is tilted on its axis (23.5 degrees). As it orbits the Sun, different parts of the Earth receive more direct sunlight for longer periods of time.
- A fossil is the preserved remains, impression, or trace of a once-living organism from a past geological age. It often forms when an organism is rapidly buried in sediment, which hardens into rock over millions of years.
- The diaphragm is a large muscle at the base of the lungs. When it contracts and moves down, it causes you to inhale. When it relaxes and moves up, you exhale.
- A hot air balloon rises because the air inside the balloon is heated, making it less dense than the cooler air outside the balloon. The less dense hot air rises, carrying the balloon with it.
- The crust.