SOL Science Practice — Questions and Answers
Question 1: What is the basic unit of structure and function in all living organisms?
- The cell (Correct answer)
- The atom
- The organ
- The tissue
Correct answer: The cell
The cell is considered the fundamental building block of life, carrying out all basic life processes.
The cell theory states that all living things are made of one or more cells, the cell is the basic unit of life, and all cells come from pre-existing cells. Cells carry out essential processes such as metabolism, reproduction, and response to stimuli, making them the fundamental unit of both structure and function in living organisms.
Question 2: Which process do plants use to convert sunlight, water, and carbon dioxide into glucose and oxygen?
- Photosynthesis (Correct answer)
- Respiration
- Fermentation
- Transpiration
Correct answer: Photosynthesis
Photosynthesis occurs in chloroplasts and uses light energy to produce glucose and release oxygen as a byproduct.
Photosynthesis is the process by which plants, algae, and some bacteria convert light energy, usually from the sun, into chemical energy stored in glucose. The overall reaction combines carbon dioxide and water in the presence of light to produce glucose and oxygen, occurring primarily in the chloroplasts of plant cells.
Question 3: What force pulls objects toward the center of the Earth?
- Gravity (Correct answer)
- Friction
- Magnetism
- Buoyancy
Correct answer: Gravity
Gravity is the force of attraction between masses, and on Earth it pulls objects toward its center.
Gravity is a fundamental force of attraction between any two objects with mass. On Earth, gravity pulls objects toward the planet's center, giving them weight and causing unsupported objects to accelerate downward at approximately 9.8 meters per second squared near the surface.
Question 4: Which state of matter has a definite volume but no definite shape, taking the shape of its container?
- Liquid (Correct answer)
- Solid
- Gas
- Plasma
Correct answer: Liquid
Liquids have a fixed volume but flow to take the shape of whatever container holds them.
A liquid has a definite volume because its particles are closely packed but can still move past one another, allowing the liquid to flow and take the shape of its container. Unlike gases, liquids do not expand to fill all available space, and unlike solids, they don't hold a fixed shape.
Question 5: In the water cycle, what is the process called when water vapor cools and changes into liquid droplets to form clouds?
- Condensation (Correct answer)
- Evaporation
- Precipitation
- Runoff
Correct answer: Condensation
Condensation occurs when water vapor cools and turns back into liquid water, forming clouds.
Condensation is the phase change process where water vapor in the atmosphere cools and transforms back into tiny liquid water droplets, which cluster together to form clouds and fog. It is a key step in the water cycle, following evaporation and preceding precipitation.
Question 6: Which simple machine is a bar that pivots on a fixed point called a fulcrum?
- Lever (Correct answer)
- Pulley
- Wedge
- Screw
Correct answer: Lever
A lever is a rigid bar that rotates around a fixed pivot point known as a fulcrum to help lift or move loads.
A lever is one of the six classical simple machines. It consists of a rigid bar that pivots on a fixed point called the fulcrum, allowing a small input force applied at one end to lift or move a larger load at the other end. Examples include seesaws, crowbars, and scissors.
SOL Science Practice
What is the basic unit of structure and function in all living organisms?