State Test Practice Science 1 — Questions and Answers
Question 1: What is photosynthesis?
- The process by which animals digest food
- The process by which plants convert sunlight, water, and CO₂ into glucose and oxygen (Correct answer)
- The breakdown of glucose for energy in cells
- The water cycle in Earth's atmosphere
Correct answer: The process by which plants convert sunlight, water, and CO₂ into glucose and oxygen
Photosynthesis is the process plants use to make food using light energy, carbon dioxide, and water.
Question 2: Which of the following is an example of a physical change?
- Burning wood
- Rusting iron
- Cutting paper (Correct answer)
- Baking a cake
Correct answer: Cutting paper
Cutting paper changes only the shape, not the chemical composition, making it a physical change.
Question 3: What is Newton's First Law of Motion?
- Force equals mass times acceleration
- For every action there is an equal and opposite reaction
- An object in motion stays in motion unless acted upon by an external force (Correct answer)
- Energy cannot be created or destroyed
Correct answer: An object in motion stays in motion unless acted upon by an external force
Newton's First Law, the law of inertia, states that objects maintain their state of rest or motion unless an unbalanced force acts on them.
Question 4: Which part of the cell is responsible for producing energy through cellular respiration?
- Nucleus
- Ribosome
- Mitochondria (Correct answer)
- Cell membrane
Correct answer: Mitochondria
The mitochondria, often called the 'powerhouse of the cell,' converts glucose and oxygen into ATP energy.
Question 5: What type of rock forms from cooled magma or lava?
- Sedimentary
- Metamorphic
- Igneous (Correct answer)
- Fossil
Correct answer: Igneous
Igneous rocks form when molten rock (magma underground or lava above ground) cools and solidifies.
Question 6: What is the role of decomposers in an ecosystem?
- They produce energy from sunlight
- They hunt and consume other animals
- They break down dead organisms and recycle nutrients back into the environment (Correct answer)
- They convert nitrogen gas into usable forms
Correct answer: They break down dead organisms and recycle nutrients back into the environment
Decomposers like bacteria and fungi break down dead matter, returning essential nutrients to the soil.
State Test Practice Science 1
What is photosynthesis?