Stanford Achievement Test Stanford Achievement Science Concepts 2 — Questions and Answers
Question 1: Which process do plants use to make their own food using sunlight?
- Respiration
- Photosynthesis (Correct answer)
- Fermentation
- Decomposition
Correct answer: Photosynthesis
Photosynthesis is the process by which plants convert sunlight, water, and carbon dioxide into glucose and oxygen.
Question 2: What is the term for the force that pulls objects toward the center of Earth?
- Magnetism
- Friction
- Gravity (Correct answer)
- Inertia
Correct answer: Gravity
Gravity is the attractive force between objects with mass, pulling everything toward Earth's center.
Question 3: Which state of matter has a definite shape and a definite volume?
- Gas
- Liquid
- Plasma
- Solid (Correct answer)
Correct answer: Solid
Solids have both a definite shape and definite volume because their particles are tightly packed and vibrate in fixed positions.
Question 4: What do we call the organisms that break down dead matter and return nutrients to the soil?
- Producers
- Consumers
- Decomposers (Correct answer)
- Predators
Correct answer: Decomposers
Decomposers such as fungi and bacteria break down dead organic matter, recycling nutrients back into the ecosystem.
Question 5: Which planet in our solar system is known as the Red Planet?
- Venus
- Jupiter
- Saturn
- Mars (Correct answer)
Correct answer: Mars
Mars appears red because iron oxide (rust) covers much of its surface.
Question 6: What type of rock is formed when magma cools and solidifies?
- Sedimentary
- Metamorphic
- Igneous (Correct answer)
- Limestone
Correct answer: Igneous
Igneous rock forms when molten magma cools either underground or after erupting from a volcano.
Question 7: Which organ in the human body pumps blood throughout the circulatory system?
- Lungs
- Brain
- Liver
- Heart (Correct answer)
Correct answer: Heart
The heart is a muscular organ that contracts rhythmically to pump blood through the body's blood vessels.
Stanford Achievement Test Stanford Achievement Science Concepts 2
Which process do plants use to make their own food using sunlight?